Pg188-2 覆盖 向上转型

package org.hanqi.array;

public class DongWu {

        private String name;

        private  String color;

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public String getColor() {
            return color;
        }

        public void setColor(String color) {
            this.color = color;
        }

        public void run()
        {
            System.out.print("会跑");
        }
        public void eat()
        {
            System.out.print("会吃东西");
        }

}

DongWu类

package org.hanqi.array;

public class TuZi extends DongWu {

    public void eat()
    {
        System.out.print("会吃萝卜");
    }

}

TuZi类

package org.hanqi.array;

public class TestDongWu {

public static void main(String[] args) {

        DongWu d=new DongWu();

        d.setName("动物");

        d.setColor("有颜色");

        System.out.print("一只"+d.getColor()+"的"+d.getName() );

        d.run();

        d.eat();

        System.out.println("");

        //子类中覆盖第二个方法
        TuZi t=new TuZi();

        t.setName("兔子");
        t.setColor("白色");

        System.out.print("一只"+t.getColor()+"的"+t.getName() );
        t.run();

        t.eat();

        System.out.println();

        //向上转型
        DongWu d1=new TuZi();

        d1.setName("狗");

        d1.setColor("黑色");

        System.out.print("一只"+d1.getColor()+"的"+d1.getName() );

        d1.run();

        d1.eat();
    }

}

测试类