浅谈JAVA设计模式之——策略模式（Strategy）

package com.lyz.design.strategy;
/**
 * Strategy 
 * @author binghe
 *
 */
public abstract class Strategy {
    public abstract void method();
}

package com.lyz.design.strategy;
/**
 * ConcreteStrategy 
 * @author binghe
 *
 */
public class StrategyImplA extends Strategy {
    public void method() {
        System.out.println("这是第一个实现");
    }
}

package com.lyz.design.strategy;
/**
 * ConcreteStrategy 
 * @author binghe
 *
 */
public class StrategyImplB extends Strategy {
    public void method() {
        System.out.println("这是第二个实现");
    }
}

package com.lyz.design.strategy;
/**
 * ConcreteStrategy 
 * @author binghe
 *
 */
public class StrategyImplC extends Strategy {
    public void method() {
        System.out.println("这是第三个实现");
    }
}

package com.lyz.design.strategy;
/**
 * Context 
 * @author binghe
 *
 */
public class Context {
    Strategy stra;
    public Context(Strategy stra) {
        this.stra = stra;
    }
    public void doMethod() {
        stra.method();
    }
}

package com.lyz.design.strategy;
/**
 * Test 
 * @author binghe
 *
 */
public class Test {
    public static void main(String[] args) {
        Context ctx = new Context(new StrategyImplA());
        ctx.doMethod();
        ctx = new Context(new StrategyImplB());
        ctx.doMethod();
        ctx = new Context(new StrategyImplC());
        ctx.doMethod();
    }
}

这是第一个实现
这是第二个实现
这是第三个实现