设计模式-策略模式

1.定义

定义一组算法，将每个算法都封装起来，并且使它们之间可以互换。

2.UML

3.代码

public abstract class Strategy {    abstract void doSomething();}

public class ConcreteStrategy1 extends Strategy {    @Override    void doSomething() {    }}

public class ConcreteStrategy2 extends Strategy {    @Override    void doSomething() {    }}

public class Context {    private Strategy mStrategy;    public Context(Strategy strategy) {        mStrategy = strategy;    }    public void doAnything() {        mStrategy.doSomething();    }}

public class Client {    public static void main(String[] args) {        Context context = new Context(new ConcreteStrategy1());        context.doAnything();        context = new Context(new ConcreteStrategy2());        context.doAnything();    }}