package com.ayo.strategy;/** * 策略模式上下文 */public class Context {    private Strategy strategy;    public Context(Strategy strategy) {        this.strategy = strategy;    }    public void test(){        strategy.say();    }    public static void main(String[] args) {        Context context = new Context(new StrategyC());        context.test();    }}

package com.ayo.strategy;/** * 策略接口 */public interface Strategy {    /**     * 策略方法     */    public void say();}

package com.ayo.strategy;/** * 策略A */public class StrategyA implements Strategy {    @Override    public void say() {        System.out.println("我选A!");    }}

package com.ayo.strategy;/** * 策略C */public class StrategyC implements Strategy {    @Override    public void say() {        System.out.println("我选C!");    }}

package com.ayo.strategy;/** * 策略B */public class StrategyB implements Strategy {    @Override    public void say() {        System.out.println("我选B!");    }}