gcd in java

1public class GCD {
2
3    public static void main(String[] args) {
4
5        int n1 = 81, n2 = 153, gcd = 1;
6
7        for(int i = 1; i <= n1 && i <= n2; ++i)
8        {
9            // Checks if i is factor of both integers
10            if(n1 % i==0 && n2 % i==0)
11                gcd = i;
12        }
13
14        System.out.printf("G.C.D of %d and %d is %d", n1, n2, gcd);
15    }
16}

1import java.util.Scanner;
2public class GCDExample3 {
3
4    public static void main(String[] args) {
5
6        int num1, num2;
7        
8        //Reading the input numbers
9        Scanner scanner = new Scanner(System.in);
10        System.out.print("Enter first number:");
11        num1 = (int)scanner.nextInt();
12        
13        System.out.print("Enter second number:");
14        num2 = (int)scanner.nextInt();
15        
16        //closing the scanner to avoid memory leaks
17        scanner.close();
18        while (num1 != num2) {
19        	if(num1 > num2)
20                num1 = num1 - num2;
21            else
22                num2 = num2 - num1;
23        }
24
25        //displaying the result
26        System.out.printf("GCD of given numbers is: %d", num2);
27    }