package cn.mwf.oo;

 public class TextExtends {

     public static void main(String[] args) {

         Student s = new Student("侠客小飞", 60, "计算机科学与技术");

         s.rest();

         s.study();

     }

 }

 class Person{

     String name;

     int height;

     public void rest() {

         System.out.println("休息一会！");

     }

 }

 class Student extends Person{

     String major;//专业

     public void study() {

         System.out.println("在图书管学习java！");

     }

     public Student(String name,int height,String major) {

         this.name = name;

         this.height = height;

         this.major = major;

     }

 }

 package cn.mwf.oo;

 //方法的重写

 public class TestOverride {

     public static void main(String[] args) {

         Vehicle v1 = new Vehicle();

         v1.run();

         v1.stop();

         Vehicle v2 = new Hourse();

         v2.run();

         v2.stop();

         Vehicle v3 = new Airplane();

         v3.run();

         v3.stop();

     }

 }

 //Vehicle类

 class Vehicle{

     public void run() {

         System.out.println("跑···");

     }

     public void stop() {

         System.out.println("停止···");

     }

 }

 //Hourse类继承Vehicle类

 class Hourse extends Vehicle{

     public void run() {

         System.out.println("嘚嘚嘚的跑");

     }

 }

 //Airplane类继承Vehicle类

 class Airplane extends Vehicle{

     public void run() {

         System.out.println("在空中飞");

     }

     public void stop() {

         System.out.println("在空中不能停，会掉下来");

     }

 }

 package cn.mwf.oo;

 public class TestObject {

     public static void main(String[] args) {

         TestObject to = new TestObject();

         System.out.println(to.toString());

         Person2 p2 = new Person2("茜茜",6);

         System.out.println(p2.toString());

     }

     public String toString() {

         return "测试Object对象";

     }

 }

 class Person2{

     String name;

     int age;

     public String toString() {

         return name+",年龄:"+age;

     }

     public Person2(String name, int age) {

         this.name = name;

         this.age = age;

     }

 }