Operator Selector Calculator Java Program

Operator Based Calculator Using Swing Package

import javax.swing.JOptionPane;
    class OperatorCalc{
        public static void main(String[]args){
            String operator = JOptionPane.showInputDialog("Enter any Operator" );
            String op = operator;
           
            String v1 = JOptionPane.showInputDialog("Enter First Value" );
            int value1 = Integer.parseInt(v1);
           
            String v2 = JOptionPane.showInputDialog("Enter Second Value" );
            int value2 = Integer.parseInt(v2);

   
    if (!(op == "+" || op == "-" || op == "*" || op == "/" || op == "%" ))
        JOptionPane.showMessageDialog(null, " Enter a valid Operator");
           
           
    if( op == "+" )
        JOptionPane.showMessageDialog(null, " Addition is " + (value1 + value2) );
           
    if( op == "-" )
        JOptionPane.showMessageDialog(null, " Subtraction " + (value1 - value2) );
           
    if( op == "*" )
        JOptionPane.showMessageDialog(null, " Multiplication is " + (value1 * value2) );
           
    if( op == "/" )
        JOptionPane.showMessageDialog(null, " Division is " + (value1 / value2) );
           
    if( op == "%" )
        JOptionPane.showMessageDialog(null, " Reminder is " + (value1 % value2) );
           
        }
    }