public class EffInit extends Thread{

	private int start;
	private int dim;
	public static int[] data;
	public static final int SIZE = 100000000;
	public static final int MAX_THR = 8;

	public EffInit (int start, int dim){
		this.start=start;
		this.dim=dim;
	}

	public static void main(String[] args) {
		data = new int [SIZE];
		long begin, end;
		int start,j;
		EffInit[] threads;

		for(int numThread=1;numThread<=MAX_THR;numThread++){
			begin= System.currentTimeMillis();
			start=0;
			threads= new EffInit[numThread];
			for(j=0;j<numThread;j++){
				threads[j] = new EffInit(start,SIZE/numThread);
				threads[j].start();
				start+= SIZE/numThread;
			}
			for(j=0;j<numThread;j++){
				try{
					threads[j].join();
				} catch(InterruptedException e) {
					e.printStackTrace();

				}
			}
			end=System.currentTimeMillis();
			System.out.println(numThread+" Thread(s) :"+ (end-begin)+ "ms");

		}
	}

	public void run(){
		int j;
		for(int i=0;i<this.dim;i++){
			for(j=0;j<10000;j++){
				data[this.start + i]=i;
			}
		}

	}
}