如果线程执行N久还没结束，就想把它杀掉，把线程留给其它任务使用。
思路：主线程执行时，开一个子线程来监控它，看是否执行完成。如果没有执行完成就把它干了，执行完了就不管。
package com.vipsoft.Thread; public class ThreadMain { public static void main(String[] args) { for (int i = 1; i <= 5; i++) { Thread mainT = Thread.currentThread(); String threadName = "Thread-" + i; SubThread st = new SubThread(threadName, mainT); Thread thread = new Thread(st); thread.start(); try { System.out.println("主线程，开始 " + threadName); Thread.sleep(i * 1000); st.setDone(); System.out.println("主线程，执行完成 " + threadName); } catch (InterruptedException e) { System.out.println("主线程，被打断 " + threadName); } } } static class SubThread implements Runnable { private String name; private Thread mainT; //如果完成了就不用杀了。 private boolean isDone; public void setDone() { isDone = true; } public SubThread(String name, Thread mainT) { this.name = name; this.mainT = mainT; } @Override public void run() { try { System.out.println("子线程，正在监控主进程 " + name); Thread.sleep(2000); //时间到了，主线程还没有完成就干掉。 if (!isDone) { mainT.interrupt(); System.out.println("子线程，干掉了主进程（超时了） " + name); } } catch (InterruptedException e) { System.out.println("子线程，被打断"); return; } } @Override public String toString() { return "MyTask [name=" + this.name + "]"; } } }
