Yes / No with boolean or if / else?

Question

I am having problems creating I / O in my program. I want the user to be able to enter y / n after the last print statement, but I'm not quite sure how to implement it. I know that this will most likely include a boolean or if / else expression, but I'm not quite sure. Any help?

import java.util.*;
import java.io.*; 
import java.util.Scanner;

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

    int age;
    String name;

    Scanner scan = new Scanner(System.in);

    System.out.println("Enter in your age.");
    age = scan.nextInt();

        if (age >= 10 && age < 18) 
        {
            System.out.println("So you're a kid, huh?");
        } 

        else if (age < 10)
        {
            System.out.println("Nice try.");
            System.exit(0);
        }
        else if (age >= 18 && age <= 100)
        {
            System.out.println("So you're an adult, huh?");
        }
        else if (age > 100)
        {
            System.out.println("Nice try.");
            System.exit(0);
        }

        Scanner in = new Scanner(System.in);
        System.out.println("Enter in your name");
        name = in.nextLine();

        System.out.println("So you're " + age + " years old and your name is " + name + "?");

        System.out.println("y/n");
        }
}

Answer 1

String answer;
boolean yn;

System.out.println("y/n");
while (true) {
  answer = in.nextLine().trim().toLowerCase();
  if (answer.equals("y")) {
    yn = true;
    break;
  } else if (answer.equals("n")) {
    yn = false;
    break;
  } else {
     System.out.println("Sorry, I didn't catch that. Please answer y/n");
  }
}

Answer 2

This is what you need?

String answer = in.nextLine()
Boolean yn = (answer.equalsIgnoreCase("Y") ? true : false);

Or you can use a shorter form:

Boolean yn = (answer.equalsIgnoreCase("Y"));

If you meant anything else, send an explanation.

Answer 3

boolean answer = in.nextLine().toLowerCase().startsWith("y");

, answer true, , y. false .

Answer 4

"y". .

, , "y" "n", , , , "" "".

.

Answer 5

,

boolean answer = "y".equalsIgnoreCase(in.nextLine());

Answer 6

do while loop :

import java.util.Scanner;

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

        int age;
        String name;
        String input = "y";
        do {
            Scanner scan = new Scanner(System.in);

            System.out.println("Enter in your age.");
            age = scan.nextInt();

            if (age >= 10 && age < 18) {
                System.out.println("So you're a kid, huh?");
            }

            else if (age < 10) {
                System.out.println("Nice try.");
                System.exit(0);
            } else if (age >= 18 && age <= 100) {
                System.out.println("So you're an adult, huh?");
            } else if (age > 100) {
                System.out.println("Nice try.");
                System.exit(0);
            }

            Scanner in = new Scanner(System.in);
            System.out.println("Enter in your name");
            name = in.nextLine();

            System.out.println("So you're " + age
                    + " years old and your name is " + name + "?");

            Scanner sc = new Scanner(System.in);
            System.out.println("y/n");
            input = sc.nextLine();
        } while (input.equalsIgnoreCase("y"));
    }
}

Answer 7

.

import java.util.Scanner;

public class MuseumHours2 {
    public static void main(String[] args) {
        String day;
        boolean yn = true;
        boolean userContinue;
        String answer;

        Scanner stdIn = new Scanner(System.in);


        do {
            System.out.println("Hello, thank you for visiting the Museum 
    website. For what day would you like to check our hours of operation?");
            day = stdIn.nextLine();

            System.out.println("Is today a holiday? Enter y or n.");
            answer = stdIn.nextLine();
                if (answer.equals("y")) {
                    yn = true;
                } else if (answer.equals("n")) {
                    yn = false;
                } else { 
                    System.out.println("Sorry, I didn't understand. Please reply y or n.");
                }

            switch (day) {
            case "Monday":
                System.out.println("Closed.");
                break;

            case "Tuesday":
                if (yn) {
                    System.out.println("We are open from 1:00 to 4:00.");
                } else {
                    System.out.println("We are open from 12:00 to 5:00.");
                }
                break;
            case "Wednesday":
                if (yn) {
                    System.out.println("We are open from 2:00 to 5:00.");
                } else { 
                    System.out.println("We are open from 1:00 to 6:00.");
                    break;
                }
            case "Thursday":
                System.out.println("Closed.");
                break;
                }
            System.out.println("Do you want to re-run the program? Type y or n.");
        } while (userContinue = "y".equalsIgnoreCase(stdIn.nextLine()));
    }
}