Thread: Help me please with this

So, hello guys, i am trying to make something, and i want to request input from user and it shoud look like this

1. xxx -> press 1 to choose this
2. xxx -> press 2 to choose this

So if they enter 3 or string or whatever i want to restart method and show again

1. xxx -> press 1 to choose this
2. xxx -> press 2 to choose this

So here is method that i am trying to restart

public static void askUser(){
        System.out.println("xxx");
        System.out.println("1. xxx");
        System.out.println("2. xxx");
        System.out.println("3. xxx");
 
 
        if(userInput.hasNextInt()){
            int numEntered = userInput.nextInt();
 
                if(numEntered == 1){
                    xx= new xx();
                } else if(numEntered == 2){
                    gs = new xx();
                } else if(numEntered == 3){
                    System.exit(0);
                } 
        } else{
            askUser();
        }
 
 
    }

So this function i'am calling into main method later, so if anyone could help me that would be cool
If i try to make it public void than it say can't call non-static methods inside static(main)
if i try to put it into new class and then call it after i fail input it goes into infinite loop

Help please.
Thanks in advance!

Using a recursive method to accomplish this is an interesting approach, and I'd like to see you get it working, but you won't (I think). Instead, use a while or do/while loop in main() that calls the method until the correct response is obtained.

Hello thanks for reply, so i made this into main method

do {
            askUser();
        } while (userInput.hasNextInt());

But i cant make it work(i am beginner keep that in mind), so it would be nice if you give me some more guidance.

Ok so, basically i am trying to make text based game.
So this should be first menu and then.
If user type 1 it opens up(GameEnglish) if type 2(GameSerbian) if type 3 Game Exits.
So i just wanted to check if user type something stupid like string or 4 or whatever number than i want to show this again
But i can not make it work. Thats my problem. So yeah, i hope you undrestand now.
I made alot more of this game but i just can make this stupid thing to work.

So here is code of class:

 
package com.textgame.Game;
 
import java.util.Scanner;
 
public class LanguageChooser {
 
    static Scanner userInput = new Scanner(System.in);
 
    private static GameEnglish ge;
    private static GameSerbian gs;
 
    public static void drawLines() {
        int k = 1;
        while (k < 200) {
            System.out.print("-");
            k++;
        }
    }
 
    public static void askUser() {
 
        System.out.println("Choose Language"); /*  SHOW THIS AGAIN  */
        System.out.println("1. English");/*  SHOW THIS AGAIN  */
        System.out.println("2. Serbian");/*  SHOW THIS AGAIN  */
        System.out.println("3. Exit Game");/*  SHOW THIS AGAIN  */
 
        if(userInput.hasNextInt()){
            int numEnter = userInput.nextInt();
 
            if (numEnter == 1) {
                ge = new GameEnglish();
            } else if (numEnter == 2) {
                gs = new GameSerbian();
            } else if (numEnter == 3) {
                System.exit(0);
            }
        }
    }
 
    public static void main(String[] args) {
        drawLines();
        do {
            askUser();
        } while (userInput.hasNextInt() != true);
 
    }
}

Ok so with code i posted above when i type something random, it just sat into infinite loop.

Again, thank you for answering, and for sharing knowledge with other for free, i really appreciate it.

The basic form of what you need to do is

boolean userResponseIsWrong = true;
 
while( userResponseIsWrong )
{
    // get user response
 
    // evaluate user response, set:
    //     userResponseIsWrong = false if response valid
}

The "get user response" part of the code can be in the while() loop or in another method that returns the response, or a couple other variations I can think of. Stick with the most basic approach you can think of and post that when you get it roughed out and need help or show us when it's working and we'll cheer you on.

Ok man, i am sorry i am bit tired and all of that so i comed out with this code:

package com.textgame.Game;
 
import java.util.Scanner;
 
public class LanguageChooser {
 
    static Scanner userInput = new Scanner(System.in);
 
    static int numEnter; 
 
    static boolean isWrong = true;
 
    private static GameEnglish ge;
    private static GameSerbian gs;
    private static int numEntered;
 
 
 
    public static void drawLines() {
        int k = 1;
        while (k < 200) {
            System.out.print("-");
            k++;
        }
    }
 
    public static void askUser() {
 
        System.out.println("\nChoose the language you want game to run");
        System.out.println("1. English");
        System.out.println("2. Serbian");
        System.out.println("3. Exit game");   
    }
 
    public static void getResponse(){
        if (userInput.hasNextInt()) {
            numEnter = userInput.nextInt();
 
            if (numEnter == 1) {
                ge = new GameEnglish();
            } else if (numEnter == 2) {
                gs = new GameSerbian();
            } else if (numEnter == 3) {
                System.exit(0);
            }
        }
    }
 
    public static void main(String[] args) {
        drawLines();
 
        while(isWrong){
            askUser();
            getResponse();
 
            if(userInput.hasNextInt() == true){
                    getResponse();
            } else {
                System.out.println("Enter number: ");
 
                askUser();
                getResponse();
                numEntered = userInput.nextInt();
            } 
        }
        isWrong = false;
 
 
 
 
    }
}

So i made it display again but i get java.util.InputMismatchException
Where i made mistake?

Thanks and sorry for so much bothering.

I did not run this program but something stood out. Check out my comments below in main and the getResponse method.

package com.textgame.Game;
 
import java.util.Scanner;
 
public class LanguageChooser {
 
    static Scanner userInput = new Scanner(System.in);
 
    static int numEnter; 
 
    static boolean isWrong = true;
 
    private static GameEnglish ge;
    private static GameSerbian gs;
    private static int numEntered;
 
 
 
    public static void drawLines() {
        int k = 1;
        while (k < 200) {
            System.out.print("-");
            k++;
        }
    }
 
    public static void askUser() {
 
        System.out.println("\nChoose the language you want game to run");
        System.out.println("1. English");
        System.out.println("2. Serbian");
        System.out.println("3. Exit game");   
    }
 
    public static void getResponse(){
 //does the below line ever get called? Where is it getting input from?
        if (userInput.hasNextInt()) {         
            numEnter = userInput.nextInt();
 
            if (numEnter == 1) {
                ge = new GameEnglish();
            } else if (numEnter == 2) {
                gs = new GameSerbian();
            } else if (numEnter == 3) {
                System.exit(0);
            }
        }
    }
 
    public static void main(String[] args) {
        drawLines();
 
        while(isWrong){
            askUser();
            getResponse();
 
            if(userInput.hasNextInt() == true){
                    getResponse();
            } else {
                /*I did not run this program but I think this line one should run
                 but where is it getting its input from?*/
                System.out.println("Enter number: ");   
 
                askUser();
                getResponse();
                numEntered = userInput.nextInt();
            } 
        }
        isWrong = false;
 
 
 
 
    }
}

An InputMismatchException will occur while running your code when an uncooperative users enters an incorrect response. The program is expecting numeric input, 1 - 3, so typing non-numeric (non-integer) input will generate the error you've reported. Your program should account for incorrect input of this type if it's part of the assignment.

Once I make your program runnable by removing classes I don't have and adding print statements to reflect the user's choice, I get a "symbol not found" error for numEntered in the main() method. That's the error a cooperative user should be getting. I believe numEntered is a typo, but I'm going to eliminate it anyway.

Your main() method can be improved:

- isWrong is only needed as a local variable to main().
- askUser() could be named more appropriately, like "presentMenu()".
- getResponse() should return a response that is used by main().
- getResponse() should return a VALID response that is used by main().
- if getResponse() is required to return a VALID response, it should contain the while() statement and error messages that collects the user's response until it is correct.
- if getResponse() does as described above, the while() loop condition in main() will repeat until the user selects '3' for exit. A while( true ) loop would work fine for that.
- if getResponse() does as described above, the if()/else in main() branches based on the user's response.
- in main(), the askUser()/getResponse() pair should only occur once.
- the Scanner object, userInput, should not be used in main().

and, finally:

- finer point: if ( aBoolean == true ) is unnecessary. simply if ( aBoolean ) will do.

Picking and choosing from the above options, I crafted the main() method:

    // a main() method to get the user's menu choice and
    // branch accordingly
    public static void main(String[] args)
    {
        drawLines();
 
        // a loop to present the menu, get user's response, and
        // branch on the user's choice until exit (or any other
        // response) is chosen
        while( true )
        {
            presentMenu();
            int response = getResponse();
 
            // this portion could be another method
            // (note how this code is written so that anyone
            // can run it - no external classes required.)
            if (response == 1) {
                System.out.println( "Game English" );
            } else if (response == 2) {
                System.out.println( "Game Serbian" );
            } else {
                System.exit(0);
            }
        }
 
    } // end method main()

Good luck! Keep coding.