Java并发学习之二——获取和设置线程信息

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可以帮助我们辨别每个线程。知道它的一些信息

ID：每一个线程的独特标示；

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，线程仅仅有6种状态：new,runnable,blocked,waiting,time
waiting 或terminated。

如今写一个程序，将线程的信息保存到文件里方便查看

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");

}

}