java线程

package wo;import java.math.*;import java.lang.*;import java.text.DateFormat;import java.util.*;import java.io.*;public class Da extends Thread{/** * @param args */int k=0;public Da(String name,int k){super(name);this.k=k;}public  void run(){int i=k;System.out.println();System.out.print(getName()+":");//try {//this.sleep(3000);//} catch (InterruptedException e) {//// TODO Auto-generated catch block//e.printStackTrace();//}while(i<50){System.out.print(i+"  ");i+=2;if(i==20)try {this.sleep(100);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}System.out.println(getName()+" end!");}public static void main(String[] args) {// TODO Auto-generated method stubDa t1=new Da("thread1",1);Da t2=new Da("thread2",2);t1.setPriority(2);t2.setPriority(9);t1.start();t2.start();System.out.println(t2.getPriority());System.out.println(t1.activeCount());}}