常用的優先級

一般來說，優先級的范圍為1-10，但在個別的操作系統上有所不同。
優先級高的線程，在運行的時候將會獲得更多的運行機會。

代碼

package cn.hanquan.test;import java.io.FileNotFoundException;/** 優先級高的線程 獲得更多的運行機會*/public class TestP {public static void main(String[] args) throws InterruptedException, FileNotFoundException {// 我的線程類MyP mp = new MyP();// 建立線程數組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());}} }

運行結果

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

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附：之前錯誤的理解，留著沒刪，是因為里面有建立線程數組的方式，可能會用到。

錯誤之處在于：線程的優先級體現在獲得運行的概率上，而不是體現在開始運行的順序上。

package cn.hanquan.test;import java.io.FileNotFoundException;/** 線程優先級的是 優先級高的先運行的概率大*/public class TestP {public static void main(String[] args) throws InterruptedException, FileNotFoundException {// 我的線程類MyP mp = new MyP();// 建立線程數組Thread[] t = new Thread[100];// 設定線程優先級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}// 開啟線程 這里開啟的順序對實際線程的開始順序也有一定的影響// sxt300級中沒有使用數組 好像就沒有這種影響？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());}}

運行結果

運行結果并沒有完全符合預期

但是如果把30行的遞增序改為遞減序，幾乎每一次都是優先級為10的線程先運行，優先級為1的線程后運行，這樣大概可以說明線程優先級對于運行順序的的影響。

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