多線程 -- interrupt()方法

interrupt()方法不會中斷一個正在運行的線程，它用於提前退出線程的阻塞狀態，也就是說當線程通過Object.wait() / Thread.sleep() / Thread.join() / 方法進入阻塞狀態後，如果調用線程中斷方法，該線程會收到一個InterruptedException中斷異常，可以在catch中編寫自己需要的代碼。

public class InterruptThread {
	
	public static void main(String[] args){
		
		Thread t1 = new Thread(new Runnable(){

			@Override
			public void run() {
				// TODO Auto-generated method stub
				try{
					long time = System.currentTimeMillis();
					while(System.currentTimeMillis()- time <1000){
						
					}
					System.out.println("T1_normal");					
				}catch(Exception e){
					System.out.println("T1_Exception e="+e);		
				}

			}
					
		},"t1");
		t1.start();
		t1.interrupt();
		
		Thread t2 = new Thread(new Runnable(){

			@Override
			public void run() {
				// TODO Auto-generated method stub
				try {
					Thread.sleep(1000);
					System.out.println("T2_sleep_normal");
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					System.out.println("T2_sleep_Exception e="+e);
				}
			}
				
		},"t2");
		t2.start();
		t2.interrupt();	
		
		Thread t4 = new Thread(new Runnable(){

			@Override
			public void run() {
				// TODO Auto-generated method stub
				try {
					this.wait(1000);
					System.out.println("T4_wait_normal");	
				} catch (Exception e) {
					// TODO Auto-generated catch block
					System.out.println("T4_wait_Exception e="+e);	
				}
			}
			
		},"t4");
		t4.start();
		t4.interrupt();
		
		Thread t5 = new Thread(new Runnable(){

			@Override
			public synchronized void run() {
				// TODO Auto-generated method stub
				try {
					this.wait(1000);
					System.out.println("T5_wait_normal");	
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					System.out.println("T5_wait_Exception e="+e);	
				}
			}
			
		},"t5");
		t5.start();
		t5.interrupt();
		
		try{
			t5.start();
			System.out.println("T5_again_wait_normal");	
		}catch(Exception e){
			System.out.println("T5_again_wait_Exception e="+e);	
		}	
		
	}
}

打印出來的log（順序隨機）：

T2_sleep_Exception e=java.lang.InterruptedException: sleep interrupted
T4_wait_Exception e=java.lang.IllegalMonitorStateException
T5_again_wait_Exception e=java.lang.IllegalThreadStateException
T5_wait_Exception e=java.lang.InterruptedException
T1_normal

1.線程T1:

log：T1_normal

 可以看出interrupt()方法不會中斷正在執行的線程。

2.線程T2:

log：T2_sleep_Exception e=java.lang.InterruptedException: sleep interrupted

可以看出sleep中斷

3.線程T4:

log:T4_wait_Exception e=java.lang.IllegalMonitorStateException

這個是在沒有被鎖定的對象中，調用wait()方法產生的異常

4.線程T5:

log:T5_wait_Exception e=java.lang.InterruptedException

wait中斷

log:

T5_again_wait_Exception e=java.lang.IllegalThreadStateException

重複調用線程的start()方法產生的異常