Thread.interrupt()方法

Thread.interrupt()方法不會終止一個正在執行的執行緒，只是發出一個阻塞狀態，呼叫Thread.isInterrupted()方法可以判斷。

public class ThreadInterrupt extends Thread {
    
    public void run() {
        boolean pause = false;
        while (!pause) {				
        }
        System.out.println("In ThreadInterrupt end at " + System.currentTimeMillis());
    }

    public static void main(String[] args) {
        try {
            ThreadInterrupt t = new  ThreadInterrupt();
            t.start();

            Thread.sleep(100);
		
            t.interrupt();
            System.out.println("In Thread main ThreadInterrupt.isInterrupted() = " + t.isInterrupted());
        } catch (InterruptedException e) {
        }
    }

}
 

輸出

In Thread main ThreadInterrupt.isInterrupted() = true

但ThreadInterrupt一直沒有停止，可以修改判斷條件來達到目的。

public void run() {
    while (!isInterrupted()) {			
    }
    System.out.println("In ThreadInterrupt end at " + System.currentTimeMillis());
}

輸出

In Thread main ThreadInterrupt.isInterrupted() = true
In ThreadInterrupt end at 1543820081439
 

interrupt方法與wait和sleep

如果執行緒處於wait或sleep狀態下，interrupt方法都會使執行緒發生InterruptedException異常。

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