Java Design Pattern 1——Stratrgy-优快云博客

本文链接：https://blog.youkuaiyun.com/wangyi1015/article/details/3988569

本文介绍了一种使用策略模式来实现不同移动方式的Java程序示例。通过定义一系列算法并将其封装到不同的类中，可以轻松地在运行时切换算法。示例包括驾驶、普通飞行及快速飞行等算法。

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package cn.hnu.wy.strategy; public interface GoAlgorithm { public void go(); } package cn.hnu.wy.strategy; public class GoByDrivingAlgorithm implements GoAlgorithm { public void go() { System.out.println("Now I'm driving."); } } package cn.hnu.wy.strategy; public class GoByFlyingAlgorithm implements GoAlgorithm { public void go() { System.out.println("Now I'm flying."); } } package cn.hnu.wy.strategy; public class GoByFlyingFastAlgorithm implements GoAlgorithm { public void go() { System.out.println("Now I'm flying fast."); } } package cn.hnu.wy.strategy; public abstract class Vehicle { private GoAlgorithm goAlgorithm; public Vehicle() { } public void setGoAlgorithm (GoAlgorithm algorithm) { goAlgorithm = algorithm; } public void go() { goAlgorithm.go(); } } package cn.hnu.wy.strategy; public class Jet extends Vehicle { public Jet() { setGoAlgorithm(new GoByFlyingFastAlgorithm()); } } package cn.hnu.wy.strategy; public class RealJet { public static void main(String[] args) { Jet jet = new Jet(); jet.setGoAlgorithm(new GoByDrivingAlgorithm()); jet.go(); jet.setGoAlgorithm(new GoByFlyingFastAlgorithm()); jet.go(); jet.setGoAlgorithm(new GoByFlyingAlgorithm()); jet.go(); } }

运行结果：

Now I'm driving.
Now I'm flying fast.
Now I'm flying.