public class Accumulator extends Thread {
	private int stratNum;
	public static int sum;
	public Accumulator(int startNum) {
		this.stratNum = startNum;
	}
	public static synchronized void add(int num) {
		sum += num;
	}
	public void run() {
		int sum = 0;
		for (int i = 0; i < 10; i++) {
			sum += stratNum + i;
		}
		add(sum);
	}
	public static void main(String[] args) throws Exception {
		Thread[] threadList = new Thread[10];
		for (int i = 0; i < 10; i++) {
			threadList[i] = new Accumulator(10 * i + 1);
			threadList[i].start();
		}
		for (int i = 0; i < 10; i++) {
			threadList[i].join();
		}
		System.out.println("Sum is : " + sum);
	}
}