线程优先级 马克- to-win：马克 java社区：防盗版实名手机尾号： 73203。java 中线程的优先级用1-10之间的数字表示，数值越大优先级越高，默认的优先级为5。Java中的线程优先级是在Thread类中定义的常量 NORM_PRIORITY : 值为5，MAX_PRIORITY :值为10，MIN_PRIORITY : 值为1，缺省优先级为 NORM_PRIORITY。有关优先级的常用方法有两个：1）final void setPriority(int newp) : 修改线程的当前优先级 2）final int getPriority() : 返回线程的优先级。马克-to-win:线程的优先级不能担保线程的执行次序。优先级高的线程获取CPU执行的几率较大，优先级低的线程也有机会执行。参考http://www.javamex.com/tutorials/threads/priority_what.shtml其中有句： there'd quite possibly be lower-priority threads that barely got any CPU at all, being continually starved by higher-priority threads that needed CPU. So Windows has a fallback mechanism, whereby a thread that hasn't run for a long time is given a temporary priority boost.大致意思：为防止低优先级的线程被饿死，Windows有个抗争的方法，给低优先级的线程一个优先级的临时提升。。。。。。更多的请大家参考此网站。 例：1.6.1-本章源码 class ThreadMark_to_win extends Thread {static boolean go=true;private String s;int i;public ThreadMark_to_win(String s) {this.s = s;}public void run() {while(go){System.out.println(s+" 到了 "+i++);try {this.sleep(1);} catch (InterruptedException ex) {ex.printStackTrace();}}}} public class Test {public static void main(String[] args) {Thread t1 = new ThreadMark_to_win("线程1");Thread t2 = new ThreadMark_to_win("线程2");t1.setPriority(1);t2.setPriority(10);t1.start();t2.start();try {Thread.sleep(30000);} catch (InterruptedException e) {e.printStackTrace();}ThreadMark_to_win.go=false;
篇幅有限更多请见扩展链接：http://www.mark-to-win.com/tutorial/java_6_HigherPriorityFirstWrong.html