About Calculate... Repost

import java.util.Scanner;
public class Calculate
{
    static Scanner in = new Scanner(System.in);

    public static void main(String [] args)
    {
        String sign;
        int num1;
        int num2;
        int num3;
        int ans;
        System.out.print("Enter your Calculations => \n");
        sign = in.nextLine();

        if(args.Length == 3)
        {
            num1 = Integer.parseInt(args[0]);
            sign = (args [1].equal("1"));
            num2 = Integer.parseInt(args[2]);
            num3 = Integer.parseInt(args[3]);
            ans = num1 + num2;
            ans = num1 - num2;
            ans = num1 / num2;
            System.out.println("Answer = "+ ans);
        }
        else if(args[1].equal("+")) 
        {
            ans = num1 + num2;
            System.out.println("num1 "+ "num2 " = ans);
        }
        else if(args[2].equal("-")) 
        {
            ans = num1 - num2;
            System.out.println("num1 "- "num2 "= ans);
        }
        else if(args[3].equal("/")) 
        {
            ans = num1 / num2;
            System.out.println("num1 "/ "num "= ans);
        }
        else if("Do it again => Calculate arg1, arg2, arg3");
    }
}
}