Java 回调函数

1，声明一个回调函数接口

public interface CallBack {

    String execute();

}

2，创建业务实现

public class BusinessServer {

   public static String test(String name){
        System.out.println("BusinessServer类test()：MyTimer 接收到了name:" + name);

        System.out.println("BusinessServer类test()：正在处理.." );
        try {
            Thread.sleep(1000);//模拟执行耗时
        } catch (InterruptedException e) {
        }
        return "[ " +name+ " ] Time success";
    }

}

3，调用回调函数类

public class Test {

    public String testTime(CallBack callBack){
        long begin = System.currentTimeMillis();
        //执行回调函数
        String res = callBack.execute();
        long end = System.currentTimeMillis();
        System.out.println("Test类testTime()：花费时间:"+ (end - begin) + ",获取到res: " + res);
        return res;
    }	

    public static void main(String[] args) {
        Test test = new Test();
        System.out.println("Test类main() start !");
        String myName = "小风";
        String result = test.testTime(new CallBack() {
            @Override
            public String execute() {
                return BusinessServer.test(myName);
            }
        });
        System.out.println("Test类main() end ! 结果是: " + result);	

    }
}