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