Java并发学习之二——获取和设置线程信息

文章转载为http://blog.csdn.net/junshuaizhang/article/details/38443315，供自己学习用

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");
        
        }


}