I am having issues with a repeating while loop in a switch statement, the loop continues to repeat - while-loop

Question

I'm a newbie coder and for a class I was required to make a vending machine-like code. However, I used a switch statement as part of it. An issue I faced is that in those if statements I added a check. The check was to ask if the user would like to continue or not, but for some reason it repeats even after an input. I wasn't entirely sure if this question was asked before, but a lot of my friends share the issue.
import java.util.Scanner;
public class hw52 {
public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
String choice;
String answer = "";
int cr = 0;
int wb = 0;
int ch = 0;
int k = 0;
int j = 0;
boolean check = true;
double cost2;
double discount;
double change = 0;
double cost = 0;
double money = 0;
int counter = 0;
do {
answer = "";
System.out.println("Select an option in the vending machine. \n
Crunch:$1.50 \n Water bottle:$2.00 \n Chips:$1.00 \n Ketchup:$4.00 \n
Juice:$2.50");
choice = keyboard.nextLine();
switch(choice.toUpperCase()){
case "CRUNCH":
cost += 1.5;
cr ++;
counter ++;
System.out.println("Cost: " + cost);
while(check = true) {
System.out.println("Do you want to continue? Yes or no?");
answer = keyboard.nextLine();
if (answer.equalsIgnoreCase("Yes")) {
check = false;
}else if(answer.equalsIgnoreCase("Yes")) {
check = false;
}else {
System.out.println("Bad input.");
}
}
case "WATER BOTTLE":
cost += 2.00;
wb++;
counter ++;
System.out.println("Cost: " + cost);
while(check = true) {
System.out.println("Do you want to continue? Yes or no?");
answer = keyboard.nextLine();
if (answer.equalsIgnoreCase("Yes")) {
check = false;
}else if(answer.equalsIgnoreCase("Yes")) {
check = false;
}else {
System.out.println("Bad input.");
}
}
case "CHIPS":
cost += 1.00;
ch++;
counter ++;
System.out.println("Cost: " + cost);
System.out.println("Cost: " + cost);
while(check = true) {
System.out.println("Do you want to continue? Yes or no?");
answer = keyboard.nextLine();
if (answer.equalsIgnoreCase("Yes")) {
check = false;
}else if(answer.equalsIgnoreCase("Yes")) {
check = false;
}else {
System.out.println("Bad input.");
}
}
case "KETCHUP":
cost += 5.00;
k++;
counter ++;
System.out.println("Cost: " + cost);
while(check = true) {
System.out.println("Do you want to continue? Yes or no?");
answer = keyboard.nextLine();
if (answer.equalsIgnoreCase("Yes")) {
check = false;
}else if(answer.equalsIgnoreCase("Yes")) {
check = false;
}else {
System.out.println("Bad input.");
}
}
case "JUICE":
cost += 2.50;
j++;
counter ++;
System.out.println("Cost: " + cost);
while(check = true) {
System.out.println("Do you want to continue? Yes or no?");
answer = keyboard.nextLine();
if (answer.equalsIgnoreCase("Yes")) {
check = false;
}else if(answer.equalsIgnoreCase("Yes")) {
check = false;
}else {
System.out.println("Bad input.");
}
}
default:
System.out.println("Not a choice! Use exact names.");
answer = "yes";
}
}while(!answer.equalsIgnoreCase("no"));
counter /= 3;
for (int i = 0; i < counter;i++) {
discount = (double)(Math.random()*.1)+.1;
cost2 = cost * discount;
cost -= cost2;
}
while(money < cost) {
System.out.println("How much money would you like to use to pay?");
money = keyboard.nextDouble();
if (money < cost) {
System.out.println("That's not enough money.");
}
}
double Q = cost / .25;
double D = (cost % .25) / .10;
double N = ((cost % .25) % .10) / .05 ;
double P = (((cost % .25) % .10) %.05) /.01;
System.out.println("The items you bought are: \n Crunch Bars: " + cr +
"\n Water Bottles: " + wb + "\n Chips: " + ch + "\n Ketchup: " + k + "\n
Juice: " + j);
System.out.println("Your change is: $" + ((Q * .25) + (D * .1) + (N *
.05) + (P*.01)));
}
}
Please excuse my messy coding style. I personally like it better, but I know a lot of people find it strange.

Answer 1

Your code never allows the user to input "no" into the answer variable. So your code always forces the user to intput "yes" or it shows the message "Bad Input".
You have this if statement in each one of your while loops. Both if and else if check the exact same condition. I assume you were probably wanting one of them to check for the answer "no" and the check variable never gets assigned to false unless "yes" is chosen:
answer = keyboard.nextLine();
if (answer.equalsIgnoreCase("Yes")) { //this is same condition as next if line.
check = false;
}else if(answer.equalsIgnoreCase("Yes")) { //this is same condition as prior if line.
check = false;
}else {
System.out.println("Bad input.");
}
Also, this is your main issue. You are ALWAYS assigning check to true in the while loop condition. you want to use the == operator.
This assigns true to the check variable in your code:
while(check = true) {
You actually want to do this:
while(check == true) {
I recommend using an IDE with a debugger that allows you to systematically step through your code and see what is happening with each line of code as it executes. It will help you find logic problems like this one.