• 線程可以有自己的優(yōu)先級(jí)，優(yōu)先級(jí)高的線程在競(jìng)爭(zhēng)資源時(shí)會(huì)更有優(yōu)勢(shì)，但是這不是絕對(duì)的。
• Java線程優(yōu)先級(jí)整型成員變量priority來標(biāo)識(shí)，范圍從1到10，數(shù)字越大優(yōu)先級(jí)越高。其中有三個(gè)靜態(tài)標(biāo)量：

public final static int MIN_PRIORITY = 1;
public final static int NORM_PRIORITY = 5;
public final static int MAX_PRIORITY = 10;

以下代碼可以展示優(yōu)先級(jí)高的線程傾向于更快完成：

package temp;

public class PriorityDemo {
    public static class HighPriority extends Thread{
        static int count = 0;
        public void run() {
            while(true) {
                synchronized(PriorityDemo.class){
                    count++;
                    if(count > 10000000) {
                        System.out.println("HighPriority is complete!");
                        break;
                    }
                }
            }
        }
    }
    
    public static class LowPriority extends Thread{
        static int count = 0;
        public void run() {
            while(true) {
                synchronized(PriorityDemo.class) {
                    count++;
                    if(count > 10000000) {
                        System.out.println("lowPriority is complete!");
                        break;
                    }
                }
            }
        }
    }
    
    public static void main(String[] args) throws InterruptedException{
        Thread high = new HighPriority();
        LowPriority low = new LowPriority();
        high.setPriority(Thread.MAX_PRIORITY);
        low.setPriority(Thread.MIN_PRIORITY);
        low.start();
        high.start();
    }
}