CODEWITHSUNDEEP
javanetbeans
Jarod Wood
Jarod Wood

Reputation: 1

Rerun Main method from Main Method

Basically the last thing I need to do for this Math Quiz I have to program, I have to ask the user if they would like to answer more problems, if yes, rerun everything in the Main Method. If no, print goodbye. The no is easy, but I'm unsure how to tell it to rerun the main method if they say yes. Here is the code in my main method. 

 public static void main(String[] args) {
    Scanner in = new Scanner(System.in);

    int digit = 0;

    String result1 = getUserChoice("");

    digit = getNumberofDigit1(digit);

    int numberOfProblems = amountOfProblems();

    for (int i = 0; i < numberOfProblems; i++) {
    int number1 = getRandomNumber1(digit);
    int number2 = getRandomNumber2(digit);

    System.out.println("Enter your answer to the following problem: \n" + 
            number1 + result1 + number2);
    int correctAnswer = getCorrectAnswer(number1, result1, number2);

    int userAnswer = getUserAnswer();

    CheckandDisplayResult(correctAnswer, userAnswer);
    }
        System.out.println("Would you like to solve more probelms(Y/N)? ");
        String moreProblems = in.next();

        if ("Y".equals(moreProblems)){
            digit = 0;

    result1 = getUserChoice("");

    digit = getNumberofDigit1(digit);

    numberOfProblems = amountOfProblems();

    for (int i = 0; i < numberOfProblems; i++) {
    int number1 = getRandomNumber1(digit);
    int number2 = getRandomNumber2(digit);

    System.out.println("Enter your answer to the following problem: \n" + 
            number1 + result1 + number2);
    int correctAnswer = getCorrectAnswer(number1, result1, number2);

    int userAnswer = getUserAnswer();

    CheckandDisplayResult(correctAnswer, userAnswer);
    }
        System.out.println("Would you like to solve more probelms(Y/N)? ");
        moreProblems = in.next();

          if ("Y".equals(moreProblems)){

        }
        System.out.println("Thank you for taking this quiz, Goodbye!");

}

Now I have tried something like,

if "Y".equals(moreProblems)){ copy and past the main method }

But that has the error of requiring an infinite loops as you'd have to have the more problems statement in every if of yes, meaning it would never end coding wise, you would keep copying and pasting forever.

Upvotes: 0

Views: 19118

Answers (5)

Vikram
Vikram

Reputation: 2072

I guess this prototype might help you

import java.util.Scanner;
 public class MathsClass {
    public static void main(String[] args){
        MathsClass object = new MathsClass();

        while(object.response())
            object.mathsQuiz();

    }

    public void mathsQuiz(){
        //your quiz functionalities
        System.out.println("Add two nos");
    }

    public boolean response(){
        System.out.println("Would u like to solve more problems? ");
        Scanner scanner = new Scanner(System.in);
        boolean response = scanner.nextBoolean();

        return response;
    }
}

Upvotes: 1

Radiodef
Radiodef

Reputation: 37845

Put all of it in a big do-while loop:

boolean more = false;

do {

    // all your code

    more = "Y".equals(moreProblems);

} while (more);

Or provided your Scanner is declared outside the loop you can just:

do {

    // all your code

} while ("Y".equals(in.next()));

Upvotes: 1

nhgrif
nhgrif

Reputation: 62052

Alternative to what others have suggested, this is the method I prefer:

while(true) {
    //do all your stuff
    if(/*some exit condition*/) { break; }
}

Upvotes: 2

Christian Tapia
Christian Tapia

Reputation: 34146

You could enclose all the code you want to "re-run" in a while loop:

boolean run = true;
while (run) {
    // Here your code
    // Here input if user want to re-run
    if (getUserChoice("").equals("NO"))
        run = false;
}

Upvotes: 3

Ernest Friedman-Hill
Ernest Friedman-Hill

Reputation: 81684

What you can do is move everything in main() into another static method, call it interact(). Then in main(), just have logic which calls interact() as long as the user wants to interact with your program. In other words, put the math quiz into one method, and the business of presenting the quiz into main(). Your program will be easier to read and easier to modify further, if needed.

Upvotes: 1

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