How to end a while Loop via user input

问题

package cst150zzhw4_worst;

import java.util.Scanner;

public class CST150zzHW4_worst {

    public static void main(String[] args) {
    //Initialize Variables
    double length; // length of room
    double width; // Width of room
    double price_per_sqyd; // Total carpet needed price
    double price_for_padding; // Price for padding
    double price_for_installation; // Price for installation
        String input; // User's input to stop or reset program
    double final_price; // The actual final price
        boolean repeat = true;

    // Create a Scanner object for keyboard input.
    Scanner keyboard = new Scanner(System.in);

        while (repeat)
        {   
        //User Input

    System.out.println("\n" +"What is the length of the room?: ");
    length = keyboard.nextInt();

    System.out.println("What is the width of the room?: ");
    width = keyboard.nextInt();

    System.out.println("What is the price of the carpet per square yard?: ");
    price_per_sqyd = keyboard.nextDouble();

        System.out.println("What is the price for the padding?: ");
        price_for_padding = keyboard.nextDouble();

        System.out.println("What is the price of the installation?: ");
        price_for_installation = keyboard.nextDouble();

        final_price = (price_for_padding + price_for_installation + price_per_sqyd)*((width*length)/9);

        keyboard.nextLine(); //Skip the newline

        System.out.println("The possible total price to install the carpet will be $" + final_price + "\n" + "Type 'yes' or 'no' if this is correct: ");
        input = keyboard.nextLine();

        } 
    }
}

How would I make it so when the user says yes the program stop and if the user says no then the program just repeats? I don't know why I'm having so much trouble. I've searched for well over 4 hours. I am only supposed to use a while loop, I think.

回答1:

You have to assign repeat in your while-loop so it becomes false if the user says yes:

repeat = !input.equalsIgnoreCase("yes");

回答2:

You just need to set repeat to true or false based on user input. So in the end, compare input with yes or no. Something like this would work for you :

if ("yes".equals(input)) 
 repeat = true; // This would continue the loop
else 
 repeat = false; // This would break the infinite while loop

回答3:

    boolean repeat = true;

   // Create a Scanner object for keyboard input.
     Scanner keyboard = new Scanner(System.in);

    while (repeat)
    {   
       -----------------------
       -------------------------
       System.out.println("Do you want to continue:");
       repeat = keyboard.nextBoolean();
    }

回答4:

you also if you want your code to be more systematic , go and search about the interrupt , specially thread interrupt , these answers above is correct , find the more organic code and implement it

回答5:

You can use a break statement to exit a while loop.

while (...) {

   input = ...;
   if (input.equals("Y")) {
     break;
   }
}

来源：https://stackoverflow.com/questions/18975208/how-to-end-a-while-loop-via-user-input

标签

java

if-statement

while-loop