Demo–静态代理模式

Person接口

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public interface Person {
    void speak();
}

Actor类（实现 Person 接口）

public class Actor implements Person{

    private String content;

    public Actor() {
    }

    public Actor(String content) {
        this.content = content;
    }

    @Override
    public void speak() {
        System.out.println(content);
    }
}

Agent类（代理Actor类）

public class Agent implements Person{

    private Actor actor;
    private String before;
    private String after;

    public Agent(Actor actor, String before, String after) {
        this.actor = actor;
        this.before = before;
        this.after = after;
    }

    public Agent() {
    }

    @Override
    public void speak() {
        System.out.println("Before Actor,Agent say: " + before);
        actor.speak();
        System.out.println("Before Actor,Agent say: " + after);
    }
}

Test 测试

@Test
public void StaticAgentTest(){

    Actor actor = new Actor("I am a Actor");
    Agent agent = new Agent(actor,"before","after");
    agent.speak();
}

测试结果

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Before Actor,Agent say: before
I am a Actor
Before Actor,Agent say: after