Java编写回调函数任务

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public class TaskFunction {

    /**
     * 内置task
     *
     * @param <ParamType>
     * @param <ReturnType>
     */
    interface Task<ParamType, ReturnType> {

        ReturnType run(ParamType type);
    }

    /**
     * 执行任务
     *
     * @param callBack 回调函数
     * @return 返回结果
     */
    public static void runTask(Task<String, String> callBack) {
        for (int i= 0; i< 10; i++) {
            String returnMsg = callBack.run("value" + i);
            System.out.println("return message: " + returnMsg);
        }
    }


    /**
     * 调用任务
     */
    public static void invokeTask() {
        runTask(new Task<String, String>() {

            @Override
            public String run(String s) {
                // TODO do something
                System.out.println("run task; received message: " + s);
                return "success: " +s;
            }
        });
    }

    public static void main(String[] args) {
        invokeTask();
    }
}