middleSquareMethod.java

import java.util.Random;

public class Main {
	static int rangeArray[]
		= { 1,	 10,	 100,	 1000,	 10000,
			100000, 1000000, 10000000, 100000000 };
	
	static long middleSquareNumber(long num, int digit)
	{
		long sqn = num * num, nextNum = 0;
		int trim = (digit / 2);
		sqn = sqn / rangeArray[trim];
		for (int i = 0; i < digit; i++) {
			nextNum += (sqn % (rangeArray[trim]))
					* (rangeArray[i]);
			sqn = sqn / 10;
		}
		return nextNum;
	}
	public static void main(String args[])
	{
		int numberOfDigit = 3;
		int start = rangeArray[numberOfDigit - 1],
			end = rangeArray[numberOfDigit];
		
		Random rand = new Random();
		long nextNumber = rand.nextInt(end - start) + start;
		System.out.print(
			"The random numbers are:\n"
			+ nextNumber + ", ");
		
		for (int i = 0; i < 9; i++) {
			nextNumber = middleSquareNumber(nextNumber,
											numberOfDigit);
			System.out.print(nextNumber + ", ");
		}
	}
}