java钩子函数

也不知道我理解的对不对，欢迎大家讨论！

自己写了个钩子函数，我理解的钩子函数：

public interface Transactioner {

    String wedontknow() ;

}

public abstract class GouZi  {

    public abstract void gouzi(Transactioner t);

}

public class Test extends GouZi{

    public static void main(String []s){
        Test t = new Test();
        t.gouzi(new Transactioner() {
            @Override
            public String wedontknow() {
                return "this is from Transactioner---wedontknow";
            }
        });
    }

    @Override
    public void gouzi(Transactioner t) {
        System.out.println("This is from gouzi function");
        System.out.print(t.wedontknow());
    }
}

===============运行结果：
This is from gouzi function
this is from Transactioner---wedontknow