设计模式--策略模式

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概念：将一些算法封装，定义成一个抽象的算法接口，由具体的实现类来实现具体的算法，具体的算法选择交给客户端决定。
类图如下：
这里写图片描述

Strategy.javapackage com.gingko;public interface Strategy {    //encrypt algorithm    public void encryptAlgorithm();}RSAEncrypt.javapackage com.gingko;/** * RAS encrypt algorithm */public class RSAEncrypt implements Strategy{    @Override    public void encryptAlgorithm() {        System.out.println("invoke RSA encrypt algorithm...");    }}DESEncrypt.javapackage com.gingko;/** * DES Encrypt algorithm */public class DESEncrypt implements Strategy{    @Override    public void encryptAlgorithm() {        System.out.println("invoke DES encrypt algorithm...");    }}Context.javapackage com.gingko;public class Context {    private Strategy strategy;    public Context(Strategy strategy) {        super();        this.strategy = strategy;    }    public void encryptAlgorithm() {        this.strategy.encryptAlgorithm();    }}

测试：具体的算法选择交给客户端决定

package com.gingko;public class Client {    public static void main(String[] args) {        //reference different strategy        Context context = new Context(new DESEncrypt());        context.encryptAlgorithm();        context = new Context(new RSAEncrypt());        context.encryptAlgorithm();    }}

测试结果：
invoke DES encrypt algorithm…
invoke RSA encrypt algorithm…

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