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Java提供一个线程调度器来监控程序中启动后进入就绪状态的所有线程，线程调度器按照优先级决定应该调度哪个线程来执行。
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线程的优先级用数字表示，范围从1~10.
Thread.MIN_PRIORITY = 1;Thread.MAX_PRIORITY = 10;Thread.NORM_PRIORITY = 5;
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使用以下方式改变或获取优先级：getPriority().setPriority(int xxxx)
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优先级低只是意味着获得调度的概率低.并不是优先级低就不会被调用了.这都是看CPU的调度
public class TestPriority extends Thread{
public static void main(String[] args) {
// 主线程默认优先级
System.out.println(Thread.currentThread().getName()+"--->"+Thread.currentThread().getPriority());
MyPriority myPriority = new MyPriority();
Thread t1 = new Thread(myPriority);
Thread t2 = new Thread(myPriority);
Thread t3 = new Thread(myPriority);
Thread t4 = new Thread(myPriority);
Thread t5 = new Thread(myPriority);
Thread t6 = new Thread(myPriority);
// 先设置优先级，再启动
t1.start();
t2.setPriority(1);
t2.start();
t3.start();
t4.setPriority(Thread.MAX_PRIORITY);
t4.start();
t5.setPriority(8);
t5.start();
t6.setPriority(4);
t6.start();
}
}
class MyPriority implements Runnable{
public void run(){
System.out.println(Thread.currentThread().getName()+"--->"+Thread.currentThread().getPriority());
}
}