java線程入門一

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線程優先順序:

在JAVA線程中，通過一個int型變數priority來控制線程優先順序，線程的有限機為1-10，預設為5，優先順序高的線程獲得的已耗用時間要高於優先順序低的線程。但這隻是一個提示，作業系統和JVM可能會根據自身情況忽略這個情況。請看下面代碼：

import java.util.ArrayList;import java.util.List;import java.util.concurrent.TimeUnit;public class Priority {    private static volatile boolean notStart=true;    private static volatile boolean notEnd=true;    public static void main(String[] args) throws Exception{        List<Job> jobs=new ArrayList<>();        for(int i=0;i<10;++i){            int priority=i<5?Thread.MIN_PRIORITY:Thread.MAX_PRIORITY;            Job job=new Job(priority);            jobs.add(job);            Thread thread=new Thread(job,"Thread"+i);            thread.setPriority(priority);            thread.start();            //thread.setPriority(188);  優先順序超出1-10,這個範圍時，運行期會拋異常；        }        notStart=false;        TimeUnit.SECONDS.sleep(10);        notEnd=false;        for(Job job:jobs){            System.out.println("Job Priority:"+job.priority+",Conut:"+job.jobCount);        }    } private  static class Job implements Runnable{        private int priority;        private long jobCount;                                                    public Job(int priority) {         this.priority = priority;     }     public void run() {                                                    while(notStart){             Thread.yield();         }         while (notEnd){             Thread.yield();             jobCount++;         }     }                      }

執行結果如下：

Job Priority:1,Conut:4665639
Job Priority:1,Conut:4814788
Job Priority:1,Conut:4783102
Job Priority:1,Conut:5667441
Job Priority:1,Conut:4688465
Job Priority:10,Conut:4618501
Job Priority:10,Conut:5598076
Job Priority:10,Conut:5212791
Job Priority:10,Conut:5627112
Job Priority:10,Conut:4332899

線程狀態：

 

java線程入門一