n Thread (Nguyen To)

import java.util.Vector;

public class DemoThread {

    int [][] data={{1,10},{11,20},{21,30}};
    int ldata = 3;

    public static void main(String[] args) {
        DemoThread demo = new DemoThread();
    }

    public DemoThread() {
        Thread[] mang;
        mang = new Thread[10];

        Vector v = new Vector();
        for (int h=0; h<ldata; h++) {
            v = KhoangNguyenTo(data[h][0], data[h][1]);
            mang[h] = Luong(h);
            mang[h].start();
        }
    }

    public Thread Luong(int h) {
        final int so = h;
        Thread th = new Thread() {
            public void run() {
                Vector v = new Vector();
                v = KhoangNguyenTo(data[so][0], data[so][1]);
                for (int i=0; i<v.size(); i++) {
                    System.out.println("**Luong" + so + "=" + v.get(i) + "**");
                }
            }
        };
        return th;
    }

    public Vector KhoangNguyenTo(int a, int b) {
        Vector vt = new Vector();
        for (int i = a; i <= b; i++) {
            if (NguyenTo(i)) {
                vt.add(i);
            }
        }
        return vt;
    }

    public boolean NguyenTo(int n) {
        if (n < 2) {
            return false;
        }
        for (int i = 2; i <= Math.sqrt(n); i++) {
            if (n % i == 0) {
                return false;
            }
        }
        return true;
    }
}