线程的礼让
利用Thread.yield()使线程进行礼让
礼让的概念：
-
礼让线程，让当前正在执行的线程暂停，但并不是阻塞
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将线程从运行状态转化为就绪状态
-
线程礼让是由cpu调度，并不一定成功
1 public class TestYield {
2
3 public static void main(String[] args) {
4 MyYield myYield = new MyYield();
5 new Thread(myYield,"a").start();
6 new Thread(myYield,"b").start();
7 }
8 }
9
10 class MyYield implements Runnable{
11
12 @Override
13 public void run() {
14 System.out.println(Thread.currentThread().getName()+ "线程开始执行");
15 Thread.yield();//礼让
16 System.out.println(Thread.currentThread().getName()+ "线程停止执行");
17 }
18 }
线程的优先级
设置线程的优先级
更改线程的优先级
其中main线程的优先级默认为5
1 public class TestPriority {
2 public static void main(String[] args) {
3 //主线程优先级
4 System.out.println(Thread.currentThread().getName()+"->"+Thread.currentThread().getPriority());
5 MyPriority myPriority = new MyPriority();
6 Thread t1 = new Thread(myPriority);
7 Thread t2 = new Thread(myPriority);
8 Thread t3 = new Thread(myPriority);
9 Thread t4 = new Thread(myPriority);
10 Thread t5 = new Thread(myPriority);
11 Thread t6 = new Thread(myPriority);
12 Thread t7 = new Thread(myPriority);
13
14 //设置优先级，在启动
15 t1.start();
16
17 t2.setPriority(1);
18 t2.start();
19
20 t3.setPriority(4);
21 t3.start();
22
23 t4.setPriority(Thread.MAX_PRIORITY);
24 t4.start();
25
26 // t5.setPriority(-1);
27 // t5.start();
28 //
29 // t6.setPriority(11);
30 // t6.start();
31 }
32 }
33 class MyPriority implements Runnable{
34
35 @Override
36 public void run() {
37 System.out.println(Thread.currentThread().getName()+"->"+Thread.currentThread().getPriority());
38
39 }
40 }
守护线程
线程分为用户线程和守护线程
虚拟机必须确保用户线程执行完毕
但虚拟机不用等待守护线程执行完毕
守护线程一般包括：后台记录日志，监控内存，垃圾回收等待等等
1 //测试守护线程
2 public class TestDaemon {
3 public static void main(String[] args) {
4 God god = new God();
5 You you = new You();
6
7
8 Thread thread = new Thread(god);
9 thread.setDaemon(true);//默认是false，正常线程都是用户线程
10 thread.start();//god线程启动
11 new Thread(you).start();//you启动
12 }
13 }
14 //GOD
15 class God implements Runnable{
16 @Override
17 public void run() {
18 while (true){
19 System.out.println("god bless you");
20 }
21 }
22 }
23
24 //YOU
25 class You implements Runnable{
26 @Override
27 public void run() {
28 for (int i = 0; i < 36500; i++) {
29 System.out.println("alive");
30 }
31 System.out.println("=====goodbye world====");
32 }
33 }
将god线程设置为守护线程
虚拟机不必等待god线程结束
在you线程正常结束后即可结束程序
标签：myPriority,Thread,22,day,start,线程,new,public From： https://www.cnblogs.com/GUGUZIZI/p/16870415.html