import java.util.Calendar;

public class MyThread extends Thread{
	private int begin;
	private int end;
	MyThread(String s){
		super(s);
	}
	MyThread()
	{
		super();
	}
	@Override
	public void run()
	{
		int sum=0;
		int mybegin=begin;
		int myend=end;
		for(int i=mybegin;i<myend;i++)
		sum+=i;
		add(sum);
	}
	public synchronized void add(int num) {
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		MyThread []arr=new MyThread[10];
		int begin=0,end = 1000000;
		Calendar cal = Calendar.getInstance();
		for(int i=1;i<11;i++)
		{
			arr[i-1]=new MyThread("t"+String.valueOf(i));
			arr[i-1].begin=begin;
			arr[i-1].end=end;
			begin+=end;
			end+=end;
		}
		int hour = cal.get(Calendar.HOUR_OF_DAY);
		int minute = cal.get(Calendar.MINUTE);
		int second = cal.get(Calendar.SECOND);
		for(int i=0;i<10;i++)
		{
			arr[i].start();
		}
		for(int i=0;i<10;i++)
			try {
				arr[i].join();
			}
		catch(Exception e) {
		}

	int hour2 = cal.get(Calendar.HOUR_OF_DAY);
	int minute2 = cal.get(Calendar.MINUTE);
	int second2 = cal.get(Calendar.SECOND);
	System.out.println("time before:" + hour+":"+minute+":"+second);
	System.out.println("time after:" + hour2+":"+minute2+":"+second2);

	}
}