同時啓動和查殺線程

Question

我說兩個線程t1和t2，我想同時啓動（同時），每個調用System.out.println()打印到控制檯，然後在同一時間完成。

請告知如何通過執行器框架來實現這一點。我正嘗試在執行器框架本身的幫助下做到這一點..！

Answer 1

您可以使用2 CountDownLatch es或CyclicBarrier來做到這一點。例如：

final CountDownLatch start = new CountDownLatch(2); 
final CountDownLatch end = new CountDownLatch(2); 

Runnable r1 = new Runnable() { 
    @Override 
    public void run() { 
     try { 
      start.countDown(); 
      start.await(); 
      System.out.println("In 1"); 
      end.countDown(); 
      end.await(); 
     } catch (InterruptedException ex) { 
      Thread.currentThread().interrupt(); //restore interruption status 
     } 
    } 
}; 
Runnable r2 = new Runnable() { 
    @Override 
    public void run() { 
     try { 
      start.countDown(); 
      start.await(); 
      System.out.println("In 2"); 
      end.countDown(); 
      end.await(); 
     } catch (InterruptedException ex) { 
      Thread.currentThread().interrupt(); //restore interruption status 
     } 
    } 
};