Basic Java Calculator using Methods

import java.util.Scanner;

public class calculator{
   
    private static final Scanner STDIN = new Scanner(System.in);
   
    public static void main(String[] args){
       
        int inpOpr;
        System.out.println("\n 1. Addition");
        System.out.println("\n 2. Substraction");
        System.out.println("\n 3. Multiplication");
        System.out.println("\n 4. Division");
        System.out.println("\n Enter your choice");