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  • Java-继承,多态-0922-04

    定义类Human,具有若干属性和功能;定义其子类Man、Woman; 在主类Test中分别创建子类、父类和上转型对象,并测试其特性。

    父类:

    package com.lianxi3;
    
    public class Human {
        private String speak;
        private String jump;
        public String getSpeak() {
            return speak;
        }
        public void setSpeak(String speak) {
            this.speak = speak;
        }
        public String getJump() {
            return jump;
        }
        public void setJump(String jump) {
            this.jump = jump;
        }
        public Human(String speak, String jump) {
            super();
            this.speak = speak;
            this.jump = jump;
        }
        public Human() {
            super();
        }
        
        public void Jump()
        {
            System.out.println("跳:"+jump);
        }
        public void Speak()
        {
            System.out.println("说:"+speak);
        }
        public void as()
        {
            System.out.println("我能工作");
        }
    
    }

    子类:

    package com.lianxi3;
    
    public class Man extends Human {
        private String shui;
        
    
        public String getShui() {
            return shui;
        }
    
    
        public void setShui(String shui) {
            this.shui = shui;
        }
    
    
        
        
        public void Shui()
        {
            System.out.println(""+shui);
        }
        
    
    }

    测试:

    package com.lianxi3;
    
    public class Test {
    
        public static void main(String[] args) {
            Man m=new Man();
            m.setJump("低");
            m.setShui("长");
            m.setSpeak("粗");
            System.out.println("声音:"+m.getSpeak()+" 跳:"+m.getJump()+" 睡:"+m.getShui());
            
            //向上转型
            Human h=new Man();
            h.as();  //如果方法被重写,则调用子类的函数
            
            
            //向下转型
            Object ob=new Man();//先转形成等级最高的object
            
            Man ma=(Man)ob;  //在转型所需要的类型
            
            
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/tfl-511/p/5898649.html
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