Person.java

package org.test4j.fortest.beans;

public class Person {
    private ISpeak speak;

    public ISpeak getSpeak() {
        return speak;
    }

    public void setSpeak(ISpeak speak) {
        this.speak = speak;
    }

    public void sayHelloTo(String name) {
        this.speak.say(String.format("hello,%s!", name));
    }
}