java学习之疑――线程

class XThread extends Thread{
long count;
XThread(String name){
super(name);
}
public void run(){
for(int i=1;i<=5;i++){
for(int j=1;j<=10000;j++){
count+=1;
}
try{
Thread.sleep(1000);
}
catch(Exception e){
}
}
}
}
public class Application{
public static void main(String[] args){
XThread highPriorityThreadObj=new XThread(">>>Thread对象");
XThread lowPriorityThreadObj=new XThread("<<<Thread对象");
highPriorityThreadObj.setPriority(Thread.NORM_PRIORITY+1);
lowPriorityThreadObj.setPriority(Thread.NORM_PRIORITY-1);

lowPriorityThreadObj.start();
highPriorityThreadObj.start();

try{
Thread.sleep(1000);
}
catch(Exception e){
}
System.out.println("highPriorityThreadObj的count值是"+highPriorityThreadObj.count);
System.out.println("lowPriorityThreadObj的count值是"+lowPriorityThreadObj.count);
System.out.println("highPriorityThreadObj is alive?"+highPriorityThreadObj.isAlive());
System.out.println("lowPriorityThreadObj is alive?"+lowPriorityThreadObj.isAlive());
}
}