abstract抽象类

最新推荐文章于 2024-08-26 17:43:48 发布

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最新推荐文章于 2024-08-26 17:43:48 发布

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分类专栏： Java自学文章标签： abstract 抽象

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本文通过定义抽象类Computer及其实现类WindowsComputer和MacComputer，展示了如何使用抽象类和多态特性来实现不同类型的计算机操作。示例中包含了打开、关闭电脑以及玩游戏等方法的实现。

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abstract class Computer{
    abstract void open();
    abstract void close();
    void playGame(){
        System.out.println("The WoW was loading...");
    }
}

class WindowsComputer extends Computer{
    public void open(){//抽象方法都是public，如果省略还是public，这一点不会改变。
        System.out.println("The Windous was loading...");
    }
    public void close(){
        System.out.println("The Windows was loging off...");
    }
}

class MacComputer extends Computer{
    public void open(){
        System.out.println("The Mac was loading...");
    }
    public void close(){
        System.out.println("The Mac was loging off...");
    }
}

public class TestDemo{
    public static void main(String args[]){
        Computer pc = new WindowsComputer();
        Computer airbook = new MacComputer();
        pc.open();
        airbook.open();
        pc.close();
        airbook.close();
        pc.playGame();
        airbook.playGame();
    }
}
/*output
The Windous was loading...
The Mac was loading...
The Windows was loging off...
The Mac was loging off...
The WoW was loading...
The WoW was loading...
*/