常用的优先级

一般来说，优先级的范围为1-10，但在个别的操作系统上有所不同。
优先级高的线程，在运行的时候将会获得更多的运行机会。

代码

package cn.hanquan.test;import java.io.FileNotFoundException;/** 优先级高的线程 获得更多的运行机会*/public class TestP {public static void main(String[] args) throws InterruptedException, FileNotFoundException {// 我的线程类MyP mp = new MyP();// 建立线程数组Thread t1 = new Thread(mp);Thread t2 = new Thread(mp);t1.setPriority(1);t2.setPriority(10);t1.start();t2.start();}
}class MyP implements Runnable {@Overridepublic void run() {Thread.yield();for (int i = 0; i < 100; i++) {System.out.println(Thread.currentThread().getName() + " --> Priority " + Thread.currentThread().getPriority());}}
}

运行结果

Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-1 --> Priority 10
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1
Thread-0 --> Priority 1

---

附：之前错误的理解，留着没删，是因为里面有建立线程数组的方式，可能会用到。

错误之处在于：线程的优先级体现在获得运行的概率上，而不是体现在开始运行的顺序上。

package cn.hanquan.test;import java.io.FileNotFoundException;/** 线程优先级的是 优先级高的先运行的概率大*/public class TestP {public static void main(String[] args) throws InterruptedException, FileNotFoundException {// 我的线程类MyP mp = new MyP();// 建立线程数组Thread[] t = new Thread[100];// 设定线程优先级for (int i = 0; i < 50; i++) {t[i] = new Thread(mp);t[i].setPriority(1);// MIN_PRIORITY}for (int i = 50; i < 100; i++) {t[i] = new Thread(mp);t[i].setPriority(10);// MAX_PRIORITY}// 开启线程 这里开启的顺序对实际线程的开始顺序也有一定的影响// sxt300级中没有使用数组 好像就没有这种影响？for (int i = 0; i < 100; i++) {t[i].start();}}
}class MyP implements Runnable {@Overridepublic void run() {Thread.yield();System.out.println(Thread.currentThread().getName() + " --> Priority " + Thread.currentThread().getPriority());}}

运行结果

运行结果并没有完全符合预期

但是如果把30行的递增序改为递减序，几乎每一次都是优先级为10的线程先运行，优先级为1的线程后运行，这样大概可以说明线程优先级对于运行顺序的的影响。

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