父类
package com.demon;
public class Traffic {
public String name;
public String way;
public int num;
public void method(){
}
}子类
package com.demon;
public class Bus extends Traffic {
public String name="巴士";
public String way="陆地";
public int num=40;
public void method(){
System.out.println(name+"在"+way+"上行走，"+"可以载"+num+"个人");
}
}测试页面
package com.demon;
public class Initail {
public static void main(String[] args) {
Traffic plane=new Plane();
plane.method();
Traffic bus=new Bus();
bus.method();
Traffic boat=new Boat();
boat.method();
}
}其实在测试页面还可以简化 一下的，如 把父类的方法定义成静态方法，在测试页面，直接通过类名调用也可以，简化一点而且
还有两个子类
package com.demon;
public class Plane extends Traffic {
public String name="飞机";
public String way="天空";
public int num=20;
public void method(){
System.out.println(name+"在"+way+"上行走，"+"可以载"+num+"个人");
}
}
-------------------------------------------------------------
package com.demon;
public class Boat extends Traffic {
public String name="轮船";
public String way="水上";
public int num=10;
public void method(){
System.out.println(name+"在"+way+"上行走，"+"可以载"+num+"个人");
}
}无法编译
还有两个子类呢？发出来学习学习！