Eclipse中可以将System.out.println()一下子全部打出吗,我看视频上有老师就打出的
Posted
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了Eclipse中可以将System.out.println()一下子全部打出吗,我看视频上有老师就打出的相关的知识,希望对你有一定的参考价值。
参考技术A 我知道你想问什么:打出sysout,然后按alt+/
一下就打出了System.out.println();
4年前的问题... 参考技术B 没看懂问的是什么意思。。。
装饰器模式
public class Competitor public void sing() System.out.println("我唱唱唱......");
public class CompetitorDecorator1 extends Competitor public void sing() this.dance(); super.sing(); private void dance() System.out.println("偏偏起舞....");
public class CompetitorDecorator2 extends Competitor public void sing() this.playMusic(); super.sing(); private void playMusic() System.out.println("播放背景音乐......");
publicclass CompetitorDecorator3 extends Competitor public void sing() super.sing(); this.introduceBackground(); private void introduceBackground() System.out.println("悲惨背景介绍,博取同情,赢感情牌....");
是的,这样确实可以完成相应的功能。但是有没有觉得怪怪的呢?
1.我们在CompetitorDecorator2内已经有了 playMusic() 代码片段,我们在CompetitorDecorator4内有和它完全一样的playMusic()代码片段,这个是不合适的,也是不可取的!
2.如果这个选手比较有才,有五花八门的各种装饰,我们为此要增加相应多的装饰类;如果他在这方面有很深的造诣,把这些装饰发挥的淋漓尽致,能把这些装饰融合到一块,这些五花八门的装饰随机组合,这得要衍生多少个子类啊!!!!!
我们一般性地算一下,如果有不同的装饰功能 N 个,那么,如果我们将这N个随机组合,将有:
也就是说做多可以产生sum 个子类,相信学过排列组合的人知道这是个什么概念,另外有多么庞大的代码重复……
装饰器
public class CompetitorDecorator extends Competitor private Competitor competitor; public CompetitorDecorator(Competitor competitor) this.competitor= competitor; public void sing() competitor.sing();
public class CompetitorDecoratorA extends CompetitorDecorator public CompetitorDecoratorA(Competitor competitor) super(competitor); public void sing() this.dance(); super.sing(); private void dance() System.out.println("偏偏起舞...."); ————————————————
public class CompetitorDecoratorB extends CompetitorDecorator public CompetitorDecoratorB(Competitor competitor) super(competitor); public void sing() this.playMusic(); super.sing(); private void playMusic() System.out.println("播放背景音乐......"); ————————————————
public class CompetitorDecoratorC extends CompetitorDecorator public CompetitorDecoratorC(Competitor competitor) super(competitor); publi cvoid sing() super.sing(); this.introduceBackground(); private void introduceBackground() System.out.println("悲惨背景介绍,博取同情,赢感情牌....");
public class Client public static void main(String[] args) Competitor com = new Competitor(); // 加入了跳舞修饰,decorator 的sing() 方法中被动态添加了dance 修饰 CompetitorDecorator decorator = new CompetitorDecoratorA(com); // 在上面修饰的基础上,加入背景音乐修饰 decorator = new CompetitorDecoratorB(decorator); // 在上面修饰的基础上,加上悲惨的身世介绍 decorator = new CompetitorDecoratorC(decorator); decorator.sing(); System.out.println("满场尖叫,满分通过!!!!!");
以上是关于Eclipse中可以将System.out.println()一下子全部打出吗,我看视频上有老师就打出的的主要内容,如果未能解决你的问题,请参考以下文章