once user press 2 times y and the next time n, when enter n how to add item1 and item2 and display total price

once the user presses 2 times y and the next time n when they enter n how to display the total price of item1 and item2

import java.util.Scanner;
import javax.swing.JOptionPane;

public class ITPL_Coursework {
   
    public static void main(String[] args) {

        String itemStr ;
        String quantityStr;
       final double tax=0.03;
       double total = 0;
       int price;
      char choice;
      
       // System.out.print("\nEnter number of the hardware component you want: "); 
        System.out.println("\tHari's Hardware Company ");
        System.out.println("\t-----------------------");
        System.out.println("\nAvailable hardware components and its price are listed below: \n1:HYPERX FURY RAM \n2:Graphics Card");
        
                       do{
                itemStr=JOptionPane.showInputDialog("Enter number of the hardware component you want: ");
                int item=Integer.parseInt(itemStr);
                quantityStr=JOptionPane.showInputDialog("Enter the quanity of the hardware component you want:");
                int quantity=Integer.parseInt(quantityStr);
                
                if(item==1){
                    price=1500;
                    total=(tax*(price*quantity));
                    System.out.println("You choose to buy HYPERX FURY RAM for: " +total);
                }
                
               if(item==2){
                   price=1000;
            
                    total=(tax*(price*quantity));
                  
                   System.out.println("You choose to buy Graphics Card for: " +total);              
               }
         
               
                System.out.print("Do you want to continue y/n?:");
                  Scanner console = new Scanner(System.in);
                     choice=console.next().charAt(0);
                }
                     
                   while(choice=='y');
                       
                   
                   System.out.println(""+total);
                   
               
    }
}

total=(tax*(price*quantity));

This only assigns total to be the current cost. If you want to sum all costs, then you need to use +=:

total += (tax*(price*quantity));