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skyofdream 2024-05-09 09:10:51 +08:00
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24
Class/c7/CenterFrameDemo.java Normal file
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package Class.c7;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Toolkit;
public class CenterFrameDemo {
public static void main(String[] args) {
Toolkit tk =Toolkit.getDefaultToolkit();
Dimension ScreenSize = tk.getScreenSize();
int width = (int)ScreenSize.getWidth()/2;
int hight = (int)ScreenSize.getHeight()/2;
int x = width/2;
int y = hight/2;
Frame f = new Frame();
f.setTitle("CenterFrame");
f.setSize(width, hight);
f.setLocation(x, y);
f.setVisible(true);
}
}

11
Class/c7/FirstGUI.java Normal file
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package Class.c7;
import java.awt.Frame;
public class FirstGUI {
public static void main(String[] args) {
Frame f = new Frame("My Fist Gui");
f.setBounds(100,100,200,100);
f.setVisible(true);
}
}

5
cn/gdpu/roleExpansion.java Normal file
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package cn.gdpu;
public interface roleExpansion {
void finishingMove();
}

16
com/experiment/DragonSlayer.java Normal file
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package com.experiment;
public class DragonSlayer extends Role {
public DragonSlayer(){
super("屠龙者", "0001", 10000);
}
public DragonSlayer(String name, String id, int health){
super(name, id, health);
}
public void finishingMove(){
System.out.println(getName()+"发动了"+"降龙掌");
}
}

16
com/experiment/FingerMan.java Normal file
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package com.experiment;
public class FingerMan extends Role {
public FingerMan(){
super("段氏", "0003", 9000);
}
public FingerMan(String name, String id, int health){
super(name, id, health);
}
public void finishingMove(){
System.out.println(getName()+"发动了"+"一阳指");
}
}

49
com/experiment/Role.java Normal file
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package com.experiment;
import cn.gdpu.roleExpansion;
public abstract class Role implements roleExpansion{
private String name;
private String id;
private int health;
public void setName(String name){
this.name = name;
}
public void setID(String id){
this.id = id;
}
public void setHealth(int health){
this.health = health;
}
public String getName(){
return this.name;
}
public String getID(){
return this.id;
}
public int getHealth(){
return this.health;
}
public Role(){
setName("人机");
setID("0000");
setHealth(1000);
}
public Role(String name, String id, int health){
setName(name);
setID(id);
setHealth(health);
}
public void move(){
System.out.println("");
}
}

16
com/experiment/SwordSaint.java Normal file
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package com.experiment;
public class SwordSaint extends Role {
public SwordSaint(){
super("剑圣", "0002", 8000);
}
public SwordSaint(String name, String id, int health){
super(name, id, health);
}
public void finishingMove(){
System.out.println(getName()+"发动了"+"六脉剑");
}
}

1
exp1/3.java Normal file
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package exp1;

31
exp1/Compare.java Normal file
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package exp1;
//这段代码用于获取三个数据并输出其中的最大值
//编写于 2024.2.27
//Java核心技术(实验一)课堂任务
import java.util.Scanner;
public class Compare{
public static void main(String[] args)
{
Scanner scan =new Scanner(System.in);
System.out.print("请输入第一个数字: ");
int a = scan.nextInt();
System.out.print("请输入第二个数字: ");
int b = scan.nextInt();
System.out.print("请输入第三个数字: ");
int c = scan.nextInt();
scan.close();
int max = 0;
if(a>b && a>c) {max = a;}
else if(b>a && b>c) {max = b;}
else if(c>a && c>b) {max = c;}
System.out.println("最大数是:" + max);
}
}

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exp1/Score.java Normal file
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package exp1;
import java.util.Scanner;
public class Score {
public static void main(String[] args){
Scanner scan = new Scanner(System.in);
System.out.print("请输入百分制成绩： ");
int score = scan.nextInt();
scan.close();
if(score>100 || score<0){
System.out.println("输入错误");
}else if(score>=90 && score<=100){
System.out.println("优秀");
}else if(score>=80 && score<90){
System.out.println("良好");
}else if(score>=70 && score<80){
System.out.println("中等");
}else if(score>=60 && score<70){
System.out.println("及格");
}else{
System.out.println("不及格");
}
}
}

14
exp1/Smp3.java Normal file
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package exp1;
public class Smp3
{
public static void main(String[] args)
{
int a;
a = (int)3L * 4;
System.out.println(a);
float b;
b = (float)3.2 * 4;
System.out.println(b);
}
}

9
exp1/calculate.java Normal file
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package exp1;
public class calculate {
public static void main(String[] args){
int c;
c = 0b10100001 & 0b10000000;
System.out.println(Integer.toBinaryString(c));
}
}

67
exp10/CopyFile.java Normal file
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package exp10;
import java.io.*;
public class CopyFile {
public static void main(String[] args) {
String dirPath = "D:/MyProjects/CoreJava/exp10/MultiFile"; //源文件路径
String dstPath = "C:/test.java"; //目标文件路径
File dir = new File(dirPath);
File dst = new File(dstPath);
File[] files = dir.listFiles();
try{ //通过三种方式将源文件复制到目标文件中
charCopy(files[0], dst);
charArryCopy(files[1], dst);
bufferCopy(files[2], dst);
}catch(IOException e){
System.out.println("程序因为IO异常结束运行!");
}
}
//一次一个字节地读写
public static void charCopy(File src, File dst) throws IOException{
InputStream in = new FileInputStream(src);
OutputStream out = new FileOutputStream(dst, true);
int b;
while ((b=in.read()) != -1){
out.write(b);
}
in.close();
out.close();
}
//一次一个季节数组地读写
public static void charArryCopy(File src, File dst) throws IOException{
InputStream in = new FileInputStream(src);
OutputStream out = new FileOutputStream(dst, true);
byte[] buffer = new byte[1024];
int size;
while((size=in.read(buffer)) != -1){
out.write(buffer, 0, size);;
}
in.close();
out.close();
}
//缓冲字节流读写
public static void bufferCopy(File src, File dst) throws IOException{
BufferedInputStream in = new BufferedInputStream(new FileInputStream(src));
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dst, true));
byte[] buffer = new byte[1024];
int size;
while((size=in.read(buffer)) != -1){
out.write(buffer, 0, size);;
}
out.flush();
in.close();
out.close();
}
}

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exp10/ListFiles.java Normal file
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package exp10;
import java.io.File;
public class ListFiles {
public static void main(String[] args) {
String dirPath = "D:/JavaFile"; //要扫描的路径
list(dirPath);
}
//递归遍历dirPath里的所有文件,并打印java文件的绝对路径
public static void list(String dirpath){
File dir = new File(dirpath);
String[] files = dir.list(); //获取该文件夹内的所有文件
for (String filename: files){
String filePath = dirpath+"/"+filename;
File f = new File(filePath);
if(f.isDirectory()){ //如果是文件夹则递归遍历
list(filePath);
}else if(f.getName().endsWith(".java")){ //如果是java文件则打印绝对路径
System.out.println(filePath);
}else{
}
}
}
}

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exp10/MultiFile/file1.java Normal file
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package exp10.MultiFile;
public class file1 {}

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exp10/MultiFile/file2.java Normal file
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package exp10.MultiFile;
public class file2 {}

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exp10/MultiFile/file3.java Normal file
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package exp10.MultiFile;
public class file3 {}

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exp11/AccountDemo.java Normal file
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package exp11;
import javax.swing.*;
public class AccountDemo {
JFrame rejister = new JFrame();
}

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exp2/Read.java Normal file
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package exp2;
class Person {
//姓名
String name;
//年龄
int age;
//国籍
//String country;
static String country;
public Person(){}
public Person(String name,int age) {
this.name = name;
this.age = age;
}
public Person(String name,int age,String country) {
this.name = name;
this.age = age;
Person.country = country;
}
public void show() {
System.out.println("姓名："+name+",年龄："+age+",国籍："+country);
}
}
class PersonDemo {
public static void main(String[] args) {
//创建对象1
Person p1 = new Person("邓丽君",16,"中国");
p1.show();
//创建对象2
Person p2 = new Person("杨幂",22);
p2.show();
//创建对象3
Person p3 = new Person("凤姐",20);
p3.show();
Person.country = "美国";
p3.show();
p1.show();
p2.show();
}
}

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exp2/StudentTest.java Normal file
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package exp2;
//学生类
class Student {
private String name;
private String age;
//无参构造
public Student() {
this.name = "张三";
this.age = "38";
}
//带参构造
public Student(String name, String age) {
this.name = name;
this.age = age;
}
void show(){
System.out.println(this.name);
System.out.println(this.age);
}
//设置姓名
static void setName(Student s, String name) {
s.name = name;
}
//设置年龄
static void setAge(Student s, String age) {
s.age = age;
}
//进行学习行为
static void study(Student s) {
System.out.println(s.name+"学习");
}
//进行考试行为
static void exam(Student s) {
System.out.println(s.name+"考试");
}
}
//测试类
public class StudentTest {
public static void main(String[] args) {
//创建学生s1
Student s1 = new Student();
Student s2 = new Student("李四", "36");
Student.study(s1);
Student.exam(s2);
}
}

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exp3/Animal.java Normal file
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package exp3;
public class Animal {
//成员变量
String name;
int weight;
String color;
//无参构造
public Animal(){
this.weight = 2;
this.color = "黑色";
this.name = "Animal";
}
//全参构造
public Animal(String name,int weight, String color){
this.name = name;
this.color = color;
this.weight = weight;
}
//动作-行走
void walk(){
System.out.println(this.name+"行走...");
}
//动作-奔跑
void run(){
System.out.println(this.name+"奔跑...");
}
}

13
exp3/AnimalExtendsTest.java Normal file
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package exp3;
public class AnimalExtendsTest {
public static void main(String[] args){
Cat cat = new Cat();
Dog dog = new Dog("大黄", 5, "黄色", "金毛");
cat.walk();
cat.miaow();
dog.run();
dog.bark();
}
}

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exp3/Car.java Normal file
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package exp3;
public class Car extends Vehicle {
//成员属性
int loader;
public Car(){
super();
this.loader = 0;
}
public Car(String brand, int wheels, float weight, int loader){
super(brand, wheels, weight);
this.loader = loader;
}
void show(){
super.show();
System.out.println("载人数: "+this.loader);
}
}

24
exp3/Cat.java Normal file
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package exp3;
public class Cat extends Animal {
//成员属性
String breed;
//无参构造
public Cat(){
super();
this.breed = "橘猫";
}
//全参构造
public Cat(String name, int weight, String color, String breed){
super(name, weight, color);
this.breed = breed;
}
//行为-喵喵叫
public void miaow(){
System.out.println(this.name+"在喵喵叫");
}
}

24
exp3/Dog.java Normal file
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package exp3;
public class Dog extends Animal {
//成员属性
String breed;
//无参构造
public Dog(){
super();
this.breed = "中华田园犬";
}
//全参构造
public Dog(String name, int weight, String color, String breed){
super(name, weight, color);
this.breed = breed;
}
//行为-吠叫
void bark(){
System.out.println(this.name+"在吠叫");
}
}

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exp3/ExtendsDemo.java Normal file
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package exp3;
//类-人
class Person{
//成员变量
String name; //姓名
int age; //年龄
//无参构造"人"
public Person(){
this.name = "无名";
this.age = 18;
}
//有参构造"人"
public Person(String name, int age){
this.name = name;
this.age = age;
}
//设置姓名
void setName(String name){
this.name = name;
}
//设置年龄
void setAge(int age){
this.age = age;
}
//行为-吃饭
void eat(Person p){
System.out.println(p.name+"吃饭");
}
//行为-睡觉
void sleep(Person p){
System.out.println(p.name+"睡觉");
}
}
//类-学生 继承自类-人
class Student extends Person{
//成员变量
String id;
//无参构造
public Student(){
super();
this.id = "0000";
}
//有参构造
public Student(String name, int age, String id){
super(name, age);
this.id = id;
}
//设置id
void setId(String id){
this.id = id;
}
//行为-学习
void study(Student s){
System.out.println(s.name+"学习");
}
//方法-展示信息
void show(){
System.out.println("姓名: "+this.name);
System.out.println("年龄: "+this.age);
System.out.println("学号: "+this.id+"\n");
}
}
public class ExtendsDemo {
public static void main(String[] args){
Student s1 = new Student();
Student s2 = new Student("梦之空", 20, "2230502119");
s1.show();;
s2.show();
}
}

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exp3/Line.java Normal file
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package exp3;
import java.lang.Math;
class Line extends Point{
protected int x,y;
Line(int a,int b){
super(a,b);
setLine(a,b);
}
public void setLine(int x,int y) {
this.x=x+x;
this.y=y+y;
}
public double length(){
int x1=super.x,y1=super.y,x2=this.x,y2=this.y;
return Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1));
}
public String toString(){
return "直线端点：["+super.x+","+super.y+"]["+x+","+y+"]直线长度："+this.length();
}
public int getX() {
return x;
}
public int getY() {
return y;
}
public void setX(int x) {
this.x = x;
}
public void setY(int y) {
this.y = y;
}
}

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exp3/LineDemo.java Normal file
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package exp3;
public class LineDemo {
public static void main(String args[]){
Line line = new Line(50,50);
System.out.println("\n"+line.toString());
}
}

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exp3/Point.java Normal file
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package exp3;
class Point{
protected int x,y;
Point(){}
Point(int a,int b){
setPoint(a,b);
}
public void setPoint(int a,int b){
x=a;
y=b;
}
}

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exp3/Trunk.java Normal file
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package exp3;
public class Trunk extends Car {
//成员属性
float payload;
public Trunk(){
super();
this.payload = 0;
}
public Trunk(String brand, int wheels, float weight, int loader, float payload){
super(brand, wheels, weight, loader);
this.payload = payload;
}
void show(){
super.show();
System.out.println("载重数: "+this.payload);
}
}

28
exp3/Vehicle.java Normal file
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package exp3;
public class Vehicle {
//成员属性
String brand; //品牌
int wheels; //车轮数
float weight; //重量
public Vehicle(){
this.brand = "无品牌";
this.wheels = 0;
this.weight = 0;
}
public Vehicle(String brand, int wheels, float weight){
this.brand = brand;
this.wheels = wheels;
this.weight = weight;
}
void show(){
System.out.println("enter super class method...");
System.out.println("品牌: "+this.brand);
System.out.println("车轮数: "+this.wheels);
System.out.println("重量: "+this.weight);
}
}

23
exp3/VehicleClient.java Normal file
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package exp3;
public class VehicleClient
{
public static void main(String args[])
{
System.out.println("输出相关数据");
Car car=new Car("",4,1500,4); //创建一个Car类对象
car.show();
Trunk trunk=new Trunk("", 8,7000,3,25000);
trunk.show();
Vehicle vehicle= new Car("", 4,2000,4);
vehicle.show();
if(vehicle instanceof Car){
((Car)vehicle).show();
}
else{
System.out.println("不能强制转换类型！");
}
vehicle=new Trunk("", 9,8000,4,30000);
vehicle.show();
}
}

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exp3/test.java Normal file
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package exp3;
class A{
int sum,num1,num2;
public A(){
num1=10;
num2=20;
sum=0;
}
void sum1(){
sum=num1+num2;
System.out.println("sum="+num1+"+"+num2+"="+sum);
}
void sum2(int n){
num1=n;
sum=num1+num2;
System.out.println("sum="+num1+"+"+num2+"="+sum);
}
}
class B extends A{
int num2;
public B(){
num2=200;
}
void sum2(){
sum=num1+num2;
System.out.println("sum="+num1+"+"+num2+"="+sum);
}
void sum2(int n){
num1=n;
sum=num1+num2;
System.out.println("sum="+num1+"+"+num2+"="+sum);
}
void sum3(int n){
super.sum2(n);
System.out.println("sum="+num1+"+"+num2+"="+sum);
}
}
public class test{
public static void main (String arg[]){
B m=new B();
m.sum1();
m.sum2();
m.sum2(50);
m.sum3(50);
}
}

62
exp4/AnimalTool.java Normal file
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package exp4;
abstract class Animal{
String name;
int age;
public Animal(){};
public Animal(String name, int age){
this.name = name;
this.age = age;
}
abstract void eat();
abstract void show();
}
class Cat extends Animal{
public Cat(){};
public Cat(String name, int age){
super(name, age);
}
void eat(){
System.out.println("猫吃鱼");
}
void show(){
System.out.println(this.name+","+this.age);
}
}
class Dog extends Animal{
public Dog(){};
public Dog(String name, int age){
super(name, age);
}
void eat(){
System.out.println("狗吃肉");
}
void show(){
System.out.println(this.name+","+this.age);
}
}
public class AnimalTool {
public static void main(String[] args){
Animal a = new Cat();
Animal b = new Dog("旺财", 3);
a.name = "Tom";
a.age = 999;
a.show();
b.show();
a.eat();
b.eat();
}
}

25
exp4/PolymorphicDemo.java Normal file
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package exp4;
class A{
String member = "fu";
void show(){
System.out.println(this.member);
}
}
class B extends A{
String member = "zi";
void show(){
System.out.println(this.member);
}
}
public class PolymorphicDemo {
public static void main(String[] args){
A a = new B();
a.show();
System.out.println(a.member);
}
}

30
exp4/PolymorphismTest.java Normal file
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package exp4;
public class PolymorphismTest {
public static void main(String[] args) {
Student[] studentArray = new Student[5];
studentArray[1] = new Undergraduate("鲁向东"); //本科生鲁向东
studentArray[0] = new Undergraduate("陈建平"); //本科生陈建平
studentArray[2] = new Postgraduate("匡晓华"); //研究生匡晓华
studentArray[3] = new Undergraduate("周丽娜"); //本科生周丽娜
studentArray[4] = new Postgraduate("梁欣欣"); //研究生梁欣欣
for (int i=0; i<studentArray.length;i++) {
studentArray[i].setCourseScore(0,87);
studentArray[i].setCourseScore(1,90);
studentArray[i].setCourseScore(2,78);
}
for (int i=0; i<5 ;i++) {
studentArray[i].calculateGrade();
}
System.out.println("姓名" + " 类型" +" 成绩");
System.out.println("-----------------------");
for (int i=0; i<5 ;i++) {
System.out.println(studentArray[i].getName( )+" "+
studentArray[i].getType( )+" "+
studentArray[i].getCourseGrade( ));
}
}
}

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exp4/Postgraduate.java Normal file
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package exp4;
class Postgraduate extends Student {
public Postgraduate(String name)
{
super(name,"研究生");
}
public void calculateGrade()
{
int total = 0;
double average = 0;
for (int i = 0; i < CourseNo; i++) {
total =total + getCourseScore(i);
};
average = total / CourseNo;
String currentGrade="";
if (average>=90){
currentGrade = "优秀";
}
else if (average>=80&&average<90) {
currentGrade = "良好";
}
else if (average>=70&&average<80) {
currentGrade = "一般";
}
else if (average>=60&&average<70) {
currentGrade = "及格";
}
else{
currentGrade = "不及格";
}
setCourseGrade(currentGrade);
}
}

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exp4/ShapeDemo.java Normal file
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package exp4;
abstract class Shapes {
public int x,y; //x，y为的坐标
public int width,height;
public Shapes(int x,int y,int width,int height) {
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}
public abstract double getArea();
public abstract double getPerimeter();
public abstract void show();
}
class Rectangle extends Shapes{
double a;
double b;
Rectangle(double a, double b){
super(0, 0, 0, 0);
this.a=a;
this.b=b;
}
public double getArea(){
return a*b;
}
public double getPerimeter(){
return (a+b)*2;
}
public void show(){
System.out.println("矩形 长:"+this.a+"宽:"+this.b);
}
}
class Circle extends Shapes{
double radius;//半径
Circle(double radius){
super(0, 0, 0, 0);
this.radius=radius;
}
public double getArea(){
return 3.14159265324*radius*radius;
}
public double getPerimeter(){
return 3.14159265324*radius*2;
}
public void show(){
System.out.println("圆 半径:"+this.radius);
}
}
public class ShapeDemo {
public static void main(String[] args){
Shapes r = new Rectangle(2, 3);
Shapes c = new Circle(5);
r.show();
System.out.println("面积:"+r.getArea()+" 周长:"+r.getPerimeter()+"\n");
c.show();
System.out.println("面积:"+c.getArea()+" 周长:"+c.getPerimeter()+"\n");
}
}

56
exp4/Student.java Normal file
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package exp4;
public abstract class Student {
final static int CourseNo = 3;
private String name;
private String type;
private int[] courses;
private String courseGrade;
public Student(){
}
public Student(String name,String type)
{
this.name = name;
this.type = type;
courses = new int[3];
courseGrade="";
}
public abstract void calculateGrade();
public String getName( )
{
return name;
}
public String getType( )
{
return type; //返回学生类型
}
public String getCourseGrade( )
{
return courseGrade;
}
public int getCourseScore(int courseNumber)
{
return courses[courseNumber];
}
public void setName(String name)
{
this.name = name;
}
public void setType(String type)
{
this.type = type;
}
public void setCourseScore(int courseNumber, int courseScore)
{
courses[courseNumber] = courseScore;//按课程索引号设置课程成绩
}
public void setCourseGrade(String courseGrade) {
this.courseGrade = courseGrade;
}
}

33
exp4/Undergraduate.java Normal file
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package exp4;
class Undergraduate extends Student {
public Undergraduate(String name)
{
super(name,"本科生");
}
public void calculateGrade() {
int total = 0;
double average = 0;
for (int i = 0; i < CourseNo; i++) {
total=total+getCourseScore(i); // 累加各门课程成绩
};
average = total / CourseNo;
String currentGrade="";
if (average>=80&&average<100){
currentGrade = "优秀";
}
else if (average>=70&&average<80){
currentGrade = "良好";
}
else if (average>=60&&average<70){
currentGrade = "一般";
}
else if (average>=50&&average<60){
currentGrade = "及格";
}
else{
currentGrade = "不及格";
}
setCourseGrade(currentGrade);
}
}

21
exp5/Outer.java Normal file
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package exp5;
class Outer {
public int num = 10;
class Inner {
public int num = 20;
public void show() {
int num = 30;
System.out.println(num);
System.out.println(this.num);
System.out.println(Outer.this.num);
}
}
public static void main(String[] args){
Outer outer = new Outer();
Outer.Inner inner = outer.new Inner();
inner.show();
}
}

18
exp5/OuterDemo.java Normal file
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package exp5;
interface Inter { void show(); }
class Outer1 { public static Inter method() {
return new Inter() {
@Override
public void show() {
System.out.println("HelloWorld");
}
};
}
}
class OuterDemo {
public static void main(String[] args) {
Outer1.method().show();
}
}

33
exp5/PersonDancerDemo.java Normal file
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package exp5;
abstract class Person {
public abstract void show();
}
class Dancer extends Person {
@Override
public void show() {
System.out.println("Dancing!!!");
}
}
class PersonTool {
public void method(Person p) {
p.show();
}
}
public class PersonDancerDemo {
public static void main(String[] args) {
PersonTool pd = new PersonTool();
Person p = new Dancer();
pd.method(p);
System.out.println("----------------");
pd.method(new Person() {
@Override
public void show() {
System.out.println("Dancing!!!");
}
});
}
}

33
exp5/RoleDemo.java Normal file
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package exp5;
import com.experiment.DragonSlayer;
import com.experiment.FingerMan;
import com.experiment.SwordSaint;
public class RoleDemo {
public static void main(String[] args){
DragonSlayer d = new DragonSlayer();
SwordSaint s = new SwordSaint();
FingerMan f = new FingerMan();
System.out.println(d.getName()+"加入战斗");
System.out.println(s.getName()+"加入战斗");
System.out.println(f.getName()+"加入战斗");
System.out.println("\n作战开始!\n");
/*交互
* 战斗过程...
* 以后再写^v^
*/
System.out.println("***激烈的战斗过程***\n");
d.finishingMove();
s.finishingMove();
f.finishingMove();
System.out.println("\n全死了!\n");
System.out.println("\n战斗结束\n");
}
}

29
exp6/AdapterDemo.java Normal file
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package exp6;
interface InnerAnonymousInterface {
void fun1();
void fun2();
void fun3();
}
abstract class Outer implements InnerAnonymousInterface{
}
public class AdapterDemo {
public static void main(String[] args) {
Outer o = new Outer(){
public void fun1(){
System.out.println("方法1");
}
public void fun2(){
System.out.println("方法2");
}
public void fun3(){
System.out.println("方法3");
}
};
o.fun1();
}
}

24
exp6/Calculator.java Normal file
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package exp6;
import java.util.Scanner;
public class Calculator {
public static void main(String[] args) {
double a, b;
String opType;
Scanner in =new Scanner(System.in);
System.out.print("请输入第一个数: ");
a = in.nextDouble();
System.out.print("请输入第二个数: ");
b = in.nextDouble();
System.out.print("请选择运算(+-*/): ");
opType = in.next();
in.close();
Operation op = OperationFactory.createOperate(opType);
op.setNumber(a, b);
System.out.println("结果是: "+op.result());
}
}

14
exp6/Operation.java Normal file
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package exp6;
public abstract class Operation {
double a;
double b;
public void setNumber(double a, double b){
this.a = a;
this.b = b;
}
abstract double result();
}

8
exp6/OperationAddtion.java Normal file
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package exp6;
public class OperationAddtion extends Operation{
double result(){
return a+b;
}
}

8
exp6/OperationDivision.java Normal file
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package exp6;
public class OperationDivision extends Operation{
double result(){
return a/b;
}
}

24
exp6/OperationFactory.java Normal file
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package exp6;
public class OperationFactory {
public static Operation createOperate(String operate) {
Operation oper = null;
switch(operate) {
case "+":
oper = new OperationAddtion();
break;
case "-":
oper = new OperationSubtraction();
break;
case "*":
oper = new OperationMultiplication();
break;
case "/":
oper = new OperationDivision();
break;
}
return oper;
}
}

8
exp6/OperationMultiplication.java Normal file
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package exp6;
public class OperationMultiplication extends Operation{
double result(){
return a*b;
}
}

8
exp6/OperationSubtraction.java Normal file
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package exp6;
public class OperationSubtraction extends Operation{
double result(){
return a-b;
}
}

54
exp7/ButtonChangeColor.java Normal file
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package exp7;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class ButtonChangeColor {
public static void main(String[] args) {
// 创建并设置JFrame实例
JFrame frame = new JFrame("按钮改变字体颜色");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 设置关闭操作为退出程序
frame.setSize(400, 200); // 设置窗体大小
frame.setLocationRelativeTo(null);
// 设置窗体布局为FlowLayout
frame.setLayout(new FlowLayout());
// 创建标签用于显示文本
JLabel label = new JLabel("点击按钮改变字体颜色");
frame.add(label); // 将标签添加到窗体
// 创建三个按钮并添加到窗体
JButton redButton = new JButton("红色");
redButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
label.setForeground(Color.RED); // 设置标签字体颜色为红色
}
});
frame.add(redButton);
JButton greenButton = new JButton("绿色");
greenButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
label.setForeground(Color.GREEN); // 设置标签字体颜色为绿色
}
});
frame.add(greenButton);
JButton blueButton = new JButton("蓝色");
blueButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
label.setForeground(Color.BLUE); // 设置标签字体颜色为蓝色
}
});
frame.add(blueButton);
// 显示窗体
frame.setVisible(true);
}
}

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exp7/EventExit.java Normal file
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package exp7;
import javax.swing.JFrame;;
public class EventExit {
public static void main(String[] args) {
JFrame f = new JFrame("窗体关闭事件");
f.setDefaultCloseOperation(3);
f.setSize(400, 200);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}

38
exp7/QQLongin.java Normal file
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package exp7;
import java.awt.*;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class QQLongin {
public static void main(String[] args) {
JFrame f = new JFrame("QQ登录");
f.setDefaultCloseOperation(3);
f.setSize(600, 400);
f.setLocationRelativeTo(null);
f.setLayout(new GridBagLayout());
JLabel idText = new JLabel("账号");
f.add(idText);
JTextField idField = new JTextField();
f.add(idField);
JLabel pwdText = new JLabel("密码");
f.add(pwdText);
JTextField pwdField = new JTextField();
f.add(pwdField);
JButton loginButton = new JButton("登录");
JButton registerButton = new JButton("注册");
f.add(loginButton);
f.add(registerButton);
f.setVisible(true);
}
}

43
exp7/Stest.java Normal file
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package exp7;
import java.awt.EventQueue;
import javax.swing.JFrame;
public class Stest {
private JFrame frame;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Stest window = new Stest();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Stest() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}

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exp7/qq.java Normal file
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package exp7;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.GridBagLayout;
import javax.swing.JLabel;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import javax.swing.JTextField;
public class qq extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel contentPane;
private JTextField textField;
private JTextField textField_1;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
qq frame = new qq();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public qq() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
GridBagLayout gbl_contentPane = new GridBagLayout();
gbl_contentPane.columnWidths = new int[]{0, 0, 0, 0, 0};
gbl_contentPane.rowHeights = new int[]{0, 0, 0, 0, 0};
gbl_contentPane.columnWeights = new double[]{0.0, 0.0, 0.0, 1.0, Double.MIN_VALUE};
gbl_contentPane.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
contentPane.setLayout(gbl_contentPane);
JLabel lblNewLabel = new JLabel("账号");
GridBagConstraints gbc_lblNewLabel = new GridBagConstraints();
gbc_lblNewLabel.insets = new Insets(0, 0, 5, 5);
gbc_lblNewLabel.gridx = 1;
gbc_lblNewLabel.gridy = 1;
contentPane.add(lblNewLabel, gbc_lblNewLabel);
textField = new JTextField();
GridBagConstraints gbc_textField = new GridBagConstraints();
gbc_textField.insets = new Insets(0, 0, 5, 0);
gbc_textField.fill = GridBagConstraints.HORIZONTAL;
gbc_textField.gridx = 3;
gbc_textField.gridy = 1;
contentPane.add(textField, gbc_textField);
textField.setColumns(10);
JLabel lblNewLabel_1 = new JLabel("密码");
GridBagConstraints gbc_lblNewLabel_1 = new GridBagConstraints();
gbc_lblNewLabel_1.insets = new Insets(0, 0, 0, 5);
gbc_lblNewLabel_1.gridx = 1;
gbc_lblNewLabel_1.gridy = 3;
contentPane.add(lblNewLabel_1, gbc_lblNewLabel_1);
textField_1 = new JTextField();
GridBagConstraints gbc_textField_1 = new GridBagConstraints();
gbc_textField_1.fill = GridBagConstraints.HORIZONTAL;
gbc_textField_1.gridx = 3;
gbc_textField_1.gridy = 3;
contentPane.add(textField_1, gbc_textField_1);
textField_1.setColumns(10);
}
}

36
exp8/CollectionSort.java Normal file
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package exp8;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
public class CollectionSort {
public static void main(String[] args) {
//获取以','分割数字的字符串, 以"-1"结束
Scanner scan = new Scanner(System.in);
System.out.println("输入以','分割的数字, 以\"-1\"结束");
String str = scan.nextLine();
scan.close();
//分割字符串
String[] sNums = str.split(",");
//将字符串数组转为整形数组
ArrayList<Integer> nums = new ArrayList<>();
for (String s : sNums) {
if(s.equals("-1"))
break;
else
nums.add(Integer.parseInt(s));
}
//对整形数组进行排序
Collections.sort(nums);
//输出整形数组
System.out.println("\n排序后的数组:");
for (Integer num : nums) {
System.out.print(num+" ");
}
}
}

46
exp8/MyList.java Normal file
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package exp8;
import java.util.LinkedList;
public class MyList<E> {
private LinkedList<E> list;
public MyList(){
list = new LinkedList<>();
}
public void show(){
System.out.print("[");
for(E e :list){
System.out.print(e+",");
}
System.out.println("\b]\n");
}
public void push(E elem){
list.add(elem);
System.out.println("Push(" + elem +")");
show();
}
public E pop(){
E elem = list.removeLast();
System.out.println("Pop(" + elem +")");
show();
return elem;
}
public static void main(String[] args) {
MyList<Integer> list = new MyList<>();
list.push(1);
list.push(2);
list.push(3);
list.pop();
list.push(4);
}
}

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exp8/Student.java Normal file
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package exp8;
class Student{
String name;
String calssName;
public Student(String name, String className){
this.name = name;
this.calssName = className;
}
public void show(){
System.out.println(this.name+","+this.calssName);
}
}

31
exp8/StudentsList.java Normal file
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package exp8;
import java.util.ArrayList;
public class StudentsList {
public static void main(String[] args) {
ArrayList<Student> students = new ArrayList<Student>();
// 外包1班的学生
students.add(new Student("张三", "外包1班"));
students.add(new Student("李四", "外包1班"));
students.add(new Student("王五", "外包1班"));
students.add(new Student("赵六", "外包1班"));
students.add(new Student("孙七", "外包1班"));
// 计算机应用1班的学生
students.add(new Student("周八", "计算机应用1班"));
students.add(new Student("吴九", "计算机应用1班"));
students.add(new Student("郑十", "计算机应用1班"));
// 计算机应用2班的学生
students.add(new Student("陈十一", "计算机应用2班"));
students.add(new Student("蒋十二", "计算机应用2班"));
students.add(new Student("沈十三", "计算机应用2班"));
students.add(new Student("韩十四", "计算机应用2班"));
for(Student s: students){
s.show();
}
}
}

24
exp8/TreeSetDemo.java Normal file
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package exp8;
import java.util.Comparator;
import java.util.TreeSet;
class Roomate{
String name;
int age;
Roomate(String name, int age){
this.name = name;
this.age = age;
}
}
public class TreeSetDemo {
TreeSet<Roomate> rs = new TreeSet<>(new Comparator<Roomate>() {
@Override
public int compare(Roomate r1, Roomate r2){
return Integer.compare(r1.age, r2.age);
}
});
}

16
exp9/EceptionExample1.java Normal file
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package exp9;
import java.io.*;
public class EceptionExample1
{
public static void main(String args[]) throws IOException
{
int c;
//try{
while((c=System.in.read())!=-1)
System.out.println(c);
//}
//catch(IOException e)
//{ }
}
}

70
exp9/ExceptionDemo.java Normal file
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// 当出现继承关系时，异常处理中要注意下面三中情况：
// * A:子类重写父类方法时，子类的方法必须抛出相同的异常或父类异常的子类。
// * B:如果父类抛出了多个异常,子类重写父类时，只能抛出相同的异常或者是他的子集，子类不能抛出父类没有的异常
// * C:如果被重写的方法没有异常抛出，那么子类的方法绝对不可以抛出异常，如果子类方法内有异常发生，那么子类只能try，不能throws。
// 请在下面代码的基础上，通过增加、修改代码对上面三种情况进行测试。
package exp9;
import java.io.FileReader;
import java.io.IOException;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class ExceptionDemo {
public static void main(String[] args) {
Fu o = new Zi();
try{
o.show();
o.method2();
o.method();
}catch(Exception e){
}
}
}
class Fu {
public void show() throws Exception {
}
public void method() {
}
public void method2() throws Exception{
}
}
class Zi extends Fu {
@Override
// public void show() throws Exception{
// [* A]
public void show() throws ArithmeticException {
System.out.println(1/0);
}
@Override
//[* B]
public void method2() throws IOException, ArrayIndexOutOfBoundsException/*, RuntimeException*/{
new FileReader("NotExistFile").close();
int[] arr = new int[3];
System.out.println(arr[5]);
}
//测试throws和try方法
// [* C]
@Override
public void method()/*throws ParseException*/{
try{
String s = "2014-11-20";
SimpleDateFormat sdf = new SimpleDateFormat();
Date d = sdf.parse(s);
System.out.println(d);
}catch(ParseException e){
System.out.println("解析日期格式失败!");
}
}
}

21
exp9/ExceptionExample3.java Normal file
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package exp9;
class myexcep extends Exception
{
//myexcep()
//{System.out.println("Excep occured");}
}
public class ExceptionExample3
{
static void f1() throws myexcep
{ throw new myexcep(); }
public static void main(String args[])
{
try
{ f1(); }
catch(myexcep e1)
{System.out.println("Exception 1");}
finally //可要可不要的finally部分
{System.out.println("this part can remain or not!"); }
}
}

39
exp9/ExceptionExample4.java Normal file
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package exp9;
class ArgumentOutOfBoundsException extends Exception // 自定义一种异常
{
ArgumentOutOfBoundsException() {
System.out.println("输入错误！欲判断的数不能为负数！");
}
}
public class ExceptionExample4 {
public static boolean prime(int m) throws ArgumentOutOfBoundsException {
if (m < 0) {
ArgumentOutOfBoundsException ae = new ArgumentOutOfBoundsException();
throw ae;
} else {
boolean isPrime = true;
for (int i = 2; i < m; i++)
if (m % i == 0) {
isPrime = false;
break;
}
return isPrime;
}
}
public static void main(String args[]) {
if (args.length != 1) {
System.out.println("输入格式错误！请按照此格式输入：java Usedefine Exception m");
System.exit(0);
}
int m = Integer.parseInt(args[0]); // 读入这个整数
try {
boolean result = prime(m); // 调用方法判断是否为素数
System.out.println("对您输入的整数" + m + "是否为素数的判断结果为：" + result);
} catch (ArgumentOutOfBoundsException e) {
System.out.println("异常名称：" + e.toString());
}
}
}

17
exp9/ExceptionExmaple2.java Normal file
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package exp9;
import java.io.*;
public class ExceptionExmaple2
{
public static void main(String args[]) throws NumberFormatException
{
System.out.println("Please Input an Interger:");
try{ //此处可能会抛出I/O异常
BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
int a=Integer.parseInt(in.readLine()); //此处可能会抛出数据格式异常
System.out.println("the Integer you input is:"+a);
}
catch(IOException e) //捕获I/O异常并处理
{ System.out.println("I/O error"); }
}
}

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exp9/ExceptionTest.java Normal file
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package exp9;
import java.util.Scanner;
public class ExceptionTest {
public static void main(String[] args) {
int[] nums = new int[5];
int size=0;
Scanner scan = new Scanner(System.in);
while (true) {
try {
String str = scan.nextLine();
nums[size] = Integer.parseInt(str);
size++;
} catch (NumberFormatException e) {
System.out.println("不接受非整数字符!");
} catch (ArrayIndexOutOfBoundsException e){
System.out.println("数组已满!");
break;
}
}
scan.close();
}
}

29
exp9/FinallyDemo2.java Normal file
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// 如下所示代码中，如果catch里面有return语句，请问finally的代码还会执行吗?
// 如果会，请问是在return前还是return后。请使用debug方法查看程序中的变量a的取值是多少。
// 如果将最后一名return a;语句移到finally中，那么又会是什么情况。
package exp9;
public class FinallyDemo2 {
public static void main(String[] args) {
System.out.println(getInt());
}
public static int getInt() {
int a = 10;
try {
System.out.println("try");
System.out.println(a / 0);
a = 20;
} catch (ArithmeticException e) {
System.out.println("catch");
a = 30;
return a;
} finally {
System.out.println("finial");
a = 40;
//return a;
}
return a;
}
}

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package test;
public class PolymorphismTest {
public static void main(String[] args) {
Student[] studentArray = new Student[5];
studentArray[0] = new Undergraduate("陈建平"); //本科生陈建平
studentArray[1] = new Undergraduate("鲁向东"); //本科生鲁向东
studentArray[2] = new Postgraduate("匡晓华"); //研究生匡晓华
studentArray[3] = new Undergraduate("周丽娜"); //本科生周丽娜
studentArray[4] = new Postgraduate("梁欣欣"); //研究生梁欣欣
for (int i=0; i<studentArray.length;i++) {
studentArray[i].setCourseScore(0,87);
studentArray[i].setCourseScore(1,90);
studentArray[i].setCourseScore(2,78);
}
for (int i=0; i<5 ;i++) {
studentArray[i].calculateGrade();
}
System.out.println("姓名" + " 类型" +" 成绩");
System.out.println("-----------------------");
for (int i=0; i<5 ;i++) {
System.out.println(studentArray[i].getName( )+" "+
studentArray[i].getType( )+" "+
studentArray[i].getCourseGrade( ));
}
}
}

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test/Postgraduate .java Normal file
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package test;
class Postgraduate extends Student {
public Postgraduate(String name)
{
super(name,"研究生");
}
public void calculateGrade()
{
int total = 0;
double average = 0;
for (int i = 0; i < CourseNo; i++) {
total =total + getCourseScore(i);
};
average = total / CourseNo;
String currentGrade="";
if (average>=90){
currentGrade = "优秀";
}
else if (average>=80&&average<90) {
currentGrade = "良好";
}
else if (average>=70&&average<80) {
currentGrade = "一般";
}
else if (average>=60&&average<70) {
currentGrade = "及格";
}
else{
currentGrade = "不及格";
}
setCourseGrade(currentGrade);
}
}

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test/ShapeDemo.java Normal file
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package test;
abstract class Shapes {
public int x,y; //x，y为的坐标
public int width,height;
public Shapes(int x,int y,int width,int height) {
this.x = x;
this.y = y;
this.width = width;
this.height = height;
}
public abstract double getArea();
public abstract double getPerimeter();
public abstract void show();
}
class Rectangle extends Shapes{
double a;
double b;
Rectangle(double a, double b){
super(0, 0, 0, 0);
this.a=a;
this.b=b;
}
public double getArea(){
return a*b;
}
public double getPerimeter(){
return (a+b)*2;
}
public void show(){
System.out.println("矩形 长:"+this.a+"宽:"+this.b);
}
}
class Circle extends Shapes{
double radius;//半径
Circle(double radius){
super(0, 0, 0, 0);
this.radius=radius;
}
public double getArea(){
return 3.14159265324*radius*radius;
}
public double getPerimeter(){
return 3.14159265324*radius*2;
}
public void show(){
System.out.println("圆 半径:"+this.radius);
}
}
public class ShapeDemo {
public static void main(String[] args){
Shapes r = new Rectangle(2, 3);
Shapes c = new Circle(5);
r.show();
System.out.println("面积:"+r.getArea()+" 周长:"+r.getPerimeter()+"\n");
c.show();
System.out.println("面积:"+c.getArea()+" 周长:"+c.getPerimeter()+"\n");
}
}

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package test;
public abstract class Student {
final static int CourseNo = 3;
private String name;
private String type;
private int[] courses;
private String courseGrade;
public Student(){
}
public Student(String name,String type)
{
this.name = name;
this.type = type;
courses = new int[3];
courseGrade="";
}
public abstract void calculateGrade();
public String getName( )
{
return name;
}
public String getType( )
{
return type; //返回学生类型
}
public String getCourseGrade( )
{
return courseGrade;
}
public int getCourseScore(int courseNumber)
{
return courses[courseNumber];
}
public void setName(String name)
{
this.name = name;
}
public void setType(String type)
{
this.type = type;
}
public void setCourseScore(int courseNumber, int courseScore)
{
courses[courseNumber] = courseScore;//按课程索引号设置课程成绩
}
public void setCourseGrade(String courseGrade) {
this.courseGrade = courseGrade;
}
}

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package test;
class Undergraduate extends Student {
public Undergraduate(String name)
{
super(name,"本科生");
}
public void calculateGrade() {
int total = 0;
double average = 0;
for (int i = 0; i < CourseNo; i++) {
total=total+getCourseScore(i); // 累加各门课程成绩
};
average = total / CourseNo;
String currentGrade="";
if (average>=80&&average<100){
currentGrade = "优秀";
}
else if (average>=70&&average<80){
currentGrade = "良好";
}
else if (average>=60&&average<70){
currentGrade = "一般";
}
else if (average>=50&&average<60){
currentGrade = "及格";
}
else{
currentGrade = "不及格";
}
setCourseGrade(currentGrade);
}
}