function to multiply two numbers x and y java programming :

class GFG {
    /* function to multiply two numbers x and y*/
    static int multiply(int x, int y) {        
        /* 0 multiplied with anything gives 0 */
        if (y == 0)
            return 0;
        /* Add x one by one */
        if (y > 0)
            return (x + multiply(x, y - 1));    
        /* the case where y is negative */
        if (y < 0)
            return -multiply(x, -y);          
        return -1;
    }    
    // Driver code
    public static void main(String[] args) {         
        System.out.print("\n" + multiply(5, -11));
    }
}
// This code is contributed by Anant Agarwal.