Use if, if else,for,while,do wile ad switch in same Java Class

import java.util.*;
import java.text.*;
class Shop{
public String item;
public int quantity;
public double price;
public double discount;
public double total;

public Shop(){}
public Shop(String item,int quantity, double price,double discount,double total) {
super();
this.item=item;
this.quantity= quantity;
this.price = price;
this.discount=discount;
this.total=total;
}
public String getItem() {
return item;
}
public int getQuantity() {
return quantity;
}
public double getPrice() {
return price;
}
public double getDiscount() {
return discount;
}
public double getTotal() {
return total;
}
public static void main(String[] args) throws Exception {
double sum=0.0;
DecimalFormat df = new DecimalFormat("##%");
List<Shop> list = new ArrayList<Shop>();
Scanner scan = new Scanner(System.in);
int menu = 0;
System.out.println("Cloth Showroom");
System.out.println();
System.out.println("1. T Shirt");
System.out.println("2. Silk sari");
System.out.println("3. Baba suit");
System.out.println("4. Trousers ");
System.out.println("5. Exit");

boolean quit = false;
do{
System.out.print("Please enter your choice: ");
menu = scan.nextInt();
System.out.println();
switch(menu) {
case 1:
System.out.print("Quantity: ");
int q1 = scan.nextInt();
System.out.print("Price: ");
double p1 = scan.nextDouble();
double d1=0.10;
double t1=(p1-(d1*p1))*q1;
list.add(new Shop("T Shirt",q1,p1,d1,t1));
break;
case 2:
System.out.print("Quantity: ");
int q2 = scan.nextInt();
System.out.print("Price: ");
double p2 = scan.nextDouble();
double d2=0.30;
double t2=(p2-(d2*p2))*q2;
list.add(new Shop("Silk sari",q2,p2,d2,t2));
break;
case 3:
System.out.print("Quantity: ");
int q3 = scan.nextInt();
System.out.print("Price: ");
double p3 = scan.nextDouble();
double d3=0.40;
double t3=(p3-(d3*p3))*q3;
list.add(new Shop("Baba suit",q3,p3,d3,t3));
break;
case 4:
System.out.print("Quantity: ");
int q4 = scan.nextInt();
System.out.print("Price: ");
double p4 = scan.nextDouble();
double d4=0.15;
double t4=(p4-(d4*p4))*q4;
list.add(new Shop("Trousers",q4,p4,d4,t4));break;
case 5:
quit = true;
System.out.println("Items Quantity Price T.Price Discount(%) Total");
for (Shop s : list){
System.out.println(s.getItem()+" " +s.getQuantity()+" "+s.getPrice()+" "+(s.getQuantity()*s.getPrice())+" "
+df.format((s.getDiscount()))+" " +s.getTotal());
sum+=s.getTotal();
}
System.out.println("Total= "+sum);

break;
default:
System.out.println("Invalid Entry!");
}
}
while (!quit);
}
}

Please visit the following link:

Calculator in java swing