Create number for sum , divide , subtract , multiplied , residue that use in Boxes and No Boxes in Java

//For Boxes

import javax.swing.JOptionPane;

   public class LAB2 {     
    public static void main(String[] args) {
       
        String firstnumber , secondnumber  ;
        int a , b , sum , divide , subtract , multiplied , residue;
                                             
        firstnumber  = JOptionPane.showInputDialog(null,"Enter firstnumber:");
        secondnumber = JOptionPane.showInputDialog(null,"Enter secondnumber:");
        a = Integer.parseInt(firstnumber);
        b = Integer.parseInt(secondnumber);
       
sum = a + b;
divide = a / b;
subtract = a - b;
multiplied = a * b;
 residue = a % b;
JOptionPane.showMessageDialog(null, "\t Sum =" +sum+ "\n divide =" +divide+ "\n subtract =" +subtract+ "\n multiplied =" +multiplied+ "\n residue =" +residue);
       
    
    }
   
}

//For No Boxes

/*
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package teedculculator;
/**   @author HOANG LIHUO     */
import java.util.Scanner;
public class TeedCulculator {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
      // 2.create variable A and B
        double a , b , sum , divide , subtract , multiplied , remainder;
        Scanner input = new Scanner(System.in);
        System.out.print("a = ");
                 a = input.nextDouble();
        System.out.print("b = "); 
                 b = input.nextDouble();
      // 3. Do the following Operations     
           // a. Sum A + B
          
                sum = a + b;
        System.out.println("a. A + B =" +sum);
       
           // b. Divide A / B
          
                divide = a / b;
        System.out.println("b. A / B =" +divide);
       
           // c. Subtract A - B
          
                subtract = a - b;
        System.out.println("c. A - B =" +subtract);
       
           // d. Multiplied A*B
          
                multiplied= a * b;
        System.out.println("d. A * B =" +multiplied);
       
           // e. Remainder A % B
          
                remainder = a % b;
        System.out.println("e. A % B =" +remainder);
       
      //
     
    } 
}