如何設(shè)置線程運(yùn)行的時(shí)間

上面的代碼有些問(wèn)題，并沒(méi)能真正結(jié)束線程。稍微改下就可以了

Thread thread = new Thread(new Runnable() {
        @Override
        public void run() {
            try {
                System.out.println(Thread.currentThread());
                Thread.sleep(6000);
            } catch (InterruptedException e) {
                e.printStackTrace();
                **return;**
            }
            System.out.println("任務(wù)繼續(xù)執(zhí)行..........");
        }
    });
    
    System.out.println(Thread.currentThread());
    thread.start();
    TimeUnit.SECONDS.timedJoin(thread, 3);
    
    if (thread.isAlive()) {
        thread.interrupt();
        throw new TimeoutException("Thread did not finish within timeout");
    }

如果，不加return，將會(huì)輸出"任務(wù)繼續(xù)執(zhí)行.........."

    Thread thread = new Thread(new Runnable() {
        @Override
        public void run() {
            try {
                System.out.println(Thread.currentThread());
                Thread.sleep(6000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    });
    
    System.out.println(Thread.currentThread());
    thread.start();
    TimeUnit.SECONDS.timedJoin(thread, 3);
    
    if (thread.isAlive()) {
        thread.interrupt();
        throw new TimeoutException("Thread did not finish within timeout");
    }

TimeUnit 有一個(gè)方法 timedJoin，如果線程未在指定時(shí)間運(yùn)行完，或者指定時(shí)間內(nèi)運(yùn)行結(jié)束，代碼會(huì)向下走，這時(shí)使用 isAlive 判斷是否執(zhí)行結(jié)束。