Java 队列式 单线程循序执行 ExecutorService executorService= Executors.newSingleThreadExecutor();

 

ExecutorService  executorService = Executors.newSingleThreadExecutor();

        executorService.execute(new Runnable() {
            @Override
            public void run() {

               //按循序执行同一个步骤（例如：递归List设置元素层级关系）
               //......
               

        });

//执行结束后，手动关闭线程池
executorService.shutdownNow();