Java并发学习之二——获取和设置线程信息

╰+攻爆jí腚メ 2022-08-10 17:55 2阅读 0赞

本文是学习网络上的文章时的总结，感谢大家无私的分享。

Thread类的对象中保存了一些属性信息能够帮助我们辨别每一个线程，知道它的一些信息

ID：每个线程的独特标示；

Name：线程的名称；

Priority：线程对象的优先级。优先级别在1-10之间，1是最低级，10是最高级。

Status：线程状态。在java中，线程只有6种状态：new,runnable,blocked,waiting,time waiting 或terminated。

现在写一个程序，将线程的信息保存到文件中方便查看

package chapter;
    
    public class Calculator2 implements Runnable{
    
    	private int number;
    	public Calculator2(int number){
    		this.number = number;
    	}
    	
    	@Override
    	public void run() {
    		// TODO Auto-generated method stub
    		for (int i = 0; i < 10; i++) {
    			System.out.printf("%s:%d*%d = %d\n",Thread.currentThread().getName(),number,i,i*number);
    		}
    	}
    }

package chapter;
    import java.io.FileWriter;
    import java.io.PrintWriter;
    import java.lang.Thread.State;
    
    public class Main2 {
    
    	/**
    	 * <p>
    	 * </p>
    	 * @author zhangjunshuai
    	 * @date 2014-8-8 下午3:36:20
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    
    		Thread[] threads = new Thread[10];
    		Thread.State[] status = new Thread.State[10];
    		for (int i = 0; i < 10; i++) {
    			threads[i] = new Thread(new Calculator2(i));
    			if((i%2) == 0)
    				threads[i].setPriority(Thread.MAX_PRIORITY);
    			else
    				threads[i].setPriority(Thread.MIN_PRIORITY);
    			threads[i].setName("Thread"+i);
    		}
    		try{
    			FileWriter file = new FileWriter(".\\xianchenglog1.txt");
    			PrintWriter pw = new PrintWriter(file);
    			for(int i =0;i<10;i++){
    				pw.println("main: status of thread "+i+": "+threads[i].getState());
    				status[i] = threads[i].getState();
    			}
    			
    			for(int i =0;i<10;i++){
    				threads[i].start();
    			}
    			boolean finish = false;
    			while(!finish){
    				for (int i = 0; i < 10; i++) {
    					if(threads[i].getState()!=status[i]){
    						writeThreadInfo(pw,threads[i],status[i]);
    					}
    				}
    				finish = true;
    			}
    			pw.close();
    		}catch(Exception e){
    			
    		}
    		
    		
    	}
    	private static void writeThreadInfo(PrintWriter pw, Thread thread, State state) {
    		   pw.printf("Main : Id %d - %s\n",thread.getId(),thread.getName());
    		
    		   pw.printf("Main : Priority: %d\n",thread.getPriority());
    		
    		   pw.printf("Main : Old State: %s\n",state);
    		
    		   pw.printf("Main : New State: %s\n",thread.getState());
    		
    		   pw.printf("Main : ************************************\n");
    		
    		}
    
    
    }

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[SouthEast]: https://img-blog.csdn.net/20140808185236740?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvanVuc2h1YWl6aGFuZw==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast
[SouthEast 1]: /images/20220810/fda111ada3eb48faab28ff58b6625469.png