Java 实例 - 获取所有线程
以下实例演示了如何使用 getName() 方法获取所有正在运行的线程：
public class Main extends Thread { public static void main(String[] args) { Main t1 = new Main(); t1.setName("thread1"); t1.start(); ThreadGroup currentGroup = Thread.currentThread().getThreadGroup(); int noThreads = currentGroup.activeCount(); Thread[] lstThreads = new Thread[noThreads]; currentGroup.enumerate(lstThreads); for (int i = 0; i < noThreads; i++) System.out.println("线程号：" + i + " = " + lstThreads[i].getName()); } }
以上代码运行输出结果为：
线程号：0 = main 线程号：1 = thread1
Java 实例 - 查看线程优先级
以下实例演示了如何使用 getThreadId() 方法获取线程id：
public class Main extends Object { private static Runnable makeRunnable() { Runnable r = new Runnable() { public void run() { for (int i = 0; i < 5; i++) { Thread t = Thread.currentThread(); System.out.println("in run() - priority=" + t.getPriority()+ ", name=" + t.getName()); try { Thread.sleep(2000); } catch (InterruptedException x) { } } } }; return r; } public static void main(String[] args) { System.out.println( "in main() - Thread.currentThread().getPriority()=" + Thread.currentThread().getPriority()); System.out.println( "in main() - Thread.currentThread().getName()="+ Thread.currentThread().getName()); Thread threadA = new Thread(makeRunnable(), "threadA"); threadA.start(); try { Thread.sleep(3000); } catch (InterruptedException x) { } System.out.println("in main() - threadA.getPriority()="+ threadA.getPriority()); } }
以上代码运行输出结果为：
in main() - Thread.currentThread().getPriority()=5 in main() - Thread.currentThread().getName()=main in run() - priority=5, name=threadA in run() - priority=5, name=threadA in main() - threadA.getPriority()=5 in run() - priority=5, name=threadA in run() - priority=5, name=threadA in run() - priority=5, name=threadA
Java 实例 - 中断线程
以下实例演示了如何使用interrupt()方法来中断线程并使用 isInterrupted() 方法来判断线程是否已中断：
public class Main extends Object implements Runnable { public void run() { try { System.out.println("in run() - 将运行 work2() 方法"); work2(); System.out.println("in run() - 从 work2() 方法回来"); } catch (InterruptedException x) { System.out.println("in run() - 中断 work2() 方法"); return; } System.out.println("in run() - 休眠后执行"); System.out.println("in run() - 正常离开"); } public void work2() throws InterruptedException { while (true) { if (Thread.currentThread().isInterrupted()) { System.out.println( "C isInterrupted()=" + Thread.currentThread().isInterrupted()); Thread.sleep(2000); System.out.println( "D isInterrupted()=" + Thread.currentThread().isInterrupted()); } } } public void work() throws InterruptedException { while (true) { for (int i = 0; i < 100000; i++) { int j = i * 2; } System.out.println( "A isInterrupted()=" + Thread.currentThread().isInterrupted()); if (Thread.interrupted()) { System.out.println( "B isInterrupted()=" + Thread.currentThread().isInterrupted()); throw new InterruptedException(); } } } public static void main(String[] args) { Main si = new Main(); Thread t = new Thread(si); t.start(); try { Thread.sleep(2000); } catch (InterruptedException x) { } System.out.println("in main() - 中断其他线程"); t.interrupt(); System.out.println("in main() - 离开"); } }
以上代码运行输出结果为：
in run() - 将运行 work2() 方法 in main() - 中断其他线程 in main() - 离开 C isInterrupted()=true in run() - 中断 work2() 方法
