Check For Nasty Number Program in Java

What is a nasty number? Well it is a number whose four different factors can be arranged in such a way that sum of two is equal to difference of other two. Take an example of nasty number 36. It have factors 1,2,3,4,6,9,12,18. So, we have 2+1=6-3 . So, it is a nasty number.

Main class

import java.util.Scanner;

class NastyMain{
	public static void main(String args[]){
		Scanner br = new Scanner(System.in);
		char x='y';
		int num=0;
		NastyFinder Nasty = new NastyFinder();
		do{
			
		System.out.print("Enter the number you want to check : ");
		num = br.nextInt();
			
		
		
		Nasty.isNasty(num);
		
		System.out.println("\n Do you want to check another number : y/anykey");
		x=br.next().charAt(0);
		}
		while(x=='y' || x=='Y');
		
	}
}

Nasty Number Finder Class

class NastyFinder{
	
	public void isNasty(int num){
		// declare arrays 
		int arr[] = new int[50];  // to store factors of given number
		int arrPlus[][] = new int[50][50]; // to store addition of factors
		int arrMinus[][] = new int[50][50]; // to store difference of factors
		
		// convert num to a positive if it's negative
		
		if(num=arIndex){
						
						d=0;
						c++;
					}
				}
				
				// increment value of a and b like we have done with c and d 
				c=0;
				d=0;
				b++;
				if(b>=arIndex){
					b=0;
					a++;
				}
				
				
		}
		
		if(yes==1){
			System.out.print("\n Yes it is a nasty number");
			yes=0;
		}
		else{
			System.out.print("\n No it is not a nasty number");
		}
	}// isNasty closed
}