Thread: Trouble with a "do while loop."

(Apologies if this is in the wrong forum topic - is this post better for a different version of Java? If so, which one?) I'm struggling to learn Java, so I made myself an exercise to play around with in learning conditional statements. When I run this code, and it gets to line 70, it duplicates the part that asks if the user wants to take anymore fruits. I haven't been able to figure out what to do to make it only ask that once. How do I get this thing to stop asking that question twice before waiting for the user to give a "yes" or "no" answer?

Here's the entire code:

 
// Import the Scanner class for user input
import java.util.Scanner;
 
public class Main {
 
    public static void main(String[] args) {
        // Create a Scanner object for user input
        Scanner scanner = new Scanner(System.in);
 
        // Get the number of apples, oranges, and bananas
        System.out.println("Enter the number of apples in the basket: ");
        int appleCount = scanner.nextInt();
 
        System.out.println("Enter the number of oranges in the basket: ");
        int orangeCount = scanner.nextInt();
 
        System.out.println("Enter the number of bananas in the basket: ");
        int bananaCount = scanner.nextInt();
 
        // Check if there are enough apples
        if (appleCount > 0) {
            System.out.println("There are " + appleCount + " apples available.");
            System.out.println("How many apples do you want to take? ");
            int applesToTake = scanner.nextInt();
 
            if (applesToTake <= appleCount) {
                appleCount -= applesToTake;
                System.out.println("You took " + applesToTake + " apples.");
            } else {
                System.out.println("Not enough apples. You can only take " + appleCount + " apples.");
            }
        } else {
            System.out.println("There are no apples in the basket.");
        }
 
        // Check if there are enough oranges
        if (orangeCount > 0) {
            System.out.println("There are " + orangeCount + " oranges available.");
            System.out.println("How many oranges do you want to take? ");
            int orangesToTake = scanner.nextInt();
 
            if (orangesToTake <= orangeCount) {
                orangeCount -= orangesToTake;
                System.out.println("You took " + orangesToTake + " oranges.");
            } else {
                System.out.println("Not enough oranges. You can only take " + orangeCount + " oranges.");
            }
        } else {
            System.out.println("There are no oranges in the basket.");
        }
 
        // Check if there are enough bananas
        if (bananaCount > 0) {
            System.out.println("There are " + bananaCount + " bananas available.");
            System.out.println("How many bananas do you want to take? ");
            int bananasToTake = scanner.nextInt();
 
            if (bananasToTake <= bananaCount) {
                bananaCount -= bananasToTake;
                System.out.println("You took " + bananasToTake + " bananas.");
            } else {
                System.out.println("Not enough bananas. You can only take " + bananaCount + " bananas.");
            }
        } else {
            System.out.println("There are no bananas in the basket.");
        }
 
        // Ask if the user wants to take any more fruits
        String choice;
        do {
            System.out.println("Do you want to take any more fruits? (Enter 'yes' or 'no')");
            choice = scanner.nextLine();
        } while (!choice.equalsIgnoreCase("yes") && !choice.equalsIgnoreCase("no"));
 
        while (choice.equalsIgnoreCase("yes")) {
            // Check if there are any apples left
            if (appleCount > 0) {
                System.out.println("There are " + appleCount + " apples left.");
                System.out.println("Do you want to take any more apples? (Enter 'yes' or 'no')");
                choice = scanner.nextLine();
 
                if (choice.equalsIgnoreCase("yes")) {
                    System.out.println("How many more apples do you want to take? ");
                    int applesToTake = scanner.nextInt();
 
                    if (applesToTake <= appleCount) {
                        appleCount -= applesToTake;
                        System.out.println("You took " + applesToTake + " more apples.");
 
                        if (orangeCount > 0) {
                            System.out.println("There are " + orangeCount + " oranges left.");
                            System.out.println("Do you want to take any more oranges? (Enter 'yes' or 'no')");
                            choice = scanner.nextLine();
 
                            if (choice.equalsIgnoreCase("yes")) {
                                System.out.println("How many more oranges do you want to take? ");
                                int orangesToTake = scanner.nextInt();
 
                                if (orangesToTake <= orangeCount) {
                                    orangeCount -= orangesToTake;
                                    System.out.println("You took " + orangesToTake + " more oranges.");
                                } else {
                                    System.out.println("There are no more oranges left.");
                                }
 
                                if (bananaCount > 0) {
                                    System.out.println("There are " + bananaCount + " bananas left.");
                                    System.out.println("Do you want to take any more bananas? (Enter 'yes' or 'no')");
                                    choice = scanner.nextLine();
 
                                    if (choice.equalsIgnoreCase("yes")) {
                                        System.out.println("How many more bananas do you want to take? ");
                                        int bananasToTake = scanner.nextInt();
 
                                        if (bananasToTake <= bananaCount) {
                                            bananaCount -= bananasToTake;
                                            System.out.println("You took " + bananasToTake + " more bananas.");
                                        } else {
                                            System.out.println("There are no more bananas left.");
                                        }
 
                                    }
                                }
                            }
                        }
                    }
                }
                // Thank the user and close the scanner object
                System.out.println("Thank you and have a nice day!");
                scanner.close();
            }
        }
    }
}

The problem might be using the Scanner class's nextLine after using the nextInt method. nextInt leaves the line-end character in the Scanner's buffer and then the call to nextLine reads that line-end and gets an empty String. Call nextLine a second time to get the desired data.
See this link:
https://www.geeksforgeeks.org/why-is...ext-functions/

You posted correctly. This is the section for code with problems.

I don't know why the designers made the Scanner class work the way it does. It is a problem for everyone.

Java has made lots of changes over the years and continues to make changes by adding new features.
See this: https://docs.oracle.com/en/java/java...3-41031E5CD094