/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.reflect.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static class ThreadA extends Thread {
		public void run() {}
	}
	public static class ThreadB extends Thread {
		public void run() {}
	}
	public static <T extends Thread> T[] makeArray(Class<T> clazz, int n) throws Exception {
		T[] res = (T[]) Array.newInstance(clazz, n);
        for (int i = 0 ; i < n ; i++) {
            res[i] = clazz.newInstance();
            res[i].start();
        }
        return res;
    }
	public static void main (String[] args) throws java.lang.Exception
	{
		ThreadA[] aa = makeArray(ThreadA.class, 3);
		ThreadB[] bb = makeArray(ThreadB.class, 2);
	}
}