使用newCachedThreadPool();創建靜態線程池

     ExecutorService pool =  Executors.newCachedThreadPool();//使用newCachedThreadPool();創建靜態線程池 for (int j = 1; j <= 10; j++) {
            
            pool.execute(new MyThread(j));
            try {
                /*
                 * 線程出現休眠時，只有一個線程在執行
                 * 線程沒有休眠時，就會出現多個線程並發執行
                 */
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}
class MyThread implements Runnable {//創建一個類實現Runnable接口
    int num;//計數
    public MyThread(){
        
    }
    public MyThread(int num) {
    
        this.num = num;
    }
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName()+":"+num);
    }