In Java, Finding Combinations From User Given Numbers

import java.util.Scanner;
public class Combo10{
	public static void main(String[]args){
		int[]nums = new int[10];
		Scanner user = new Scanner(System.in);
		int i = nums.length - 1;
		while(0 <= i){
			System.out.print("Enter number: ");
			nums[i --] = user.nextInt();
		}
		int j = nums.length - 1;
		int n1, n2;
		System.out.println("Trying combinations ...");
		while(0 <= j){
			n1 = nums[j --];
			i = nums.length - 1;
			while(0 <= i){
				n2 = nums[i --];
				if(n1 != n2){
					System.out.printf("%d & %d%n", n1, n2);
				}
			}
		}
	}
}

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