Java 隊列式 單線程循序執行 ExecutorService executorService= Executors.newSingleThreadExecutor();

 

ExecutorService  executorService = Executors.newSingleThreadExecutor();

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

               //按循序執行同一個步驟（例如：遞歸List設置元素層級關係）
               //......
               

        });

//執行結束後，手動關閉線程池
executorService.shutdownNow();