How to make a program restart if wrong input in java
<p>In java if the user puts in the wrong input how do you make the program restart at the question you asked them for example in the code that i posted below i got the question Pick a number between 0-9 how do i make it restart at that question if the user inputs a wrong input like 10 or higher or a string. I would greatly appreciate any tips or suggestions.</p>

<pre><code>import java.util.Scanner;

public class Project2 {

    public static void main(String[] args) {
        String PlayAgain = "Y";

        while (PlayAgain.equals("Y")) {
            // Generate a secret Numbers
            int number1 = (int) (Math.random() * 10);
            int number2 = (int) (Math.random() * 10);
            int number3 = (int) (Math.random() * 10);
            int arr[] = new int[3];
            arr[0] = number1;
            arr[1] = number2;
            arr[2] = number3;

            boolean g1;
            boolean g2;
            boolean g3;

            g1 = false;
            g2 = false;
            g3 = false;

            // Show secret numbers
            System.out.println(arr[0] + ", " + arr[1] + ", " + arr[2]);

            Scanner input = new Scanner(System.in);

            // Prompt the user to enter a guess

            System.out.print("Enter your lottery pick (0-9): ");
            int guess1 = input.nextInt();

            if (guess1 &gt; 9) {
                System.out
                        .println("Wrong input enter only 1 number between 0-9: ");
            } else {

            }

            System.out.print("Enter your lottery pick (0-9): ");
            int guess2 = input.nextInt();

            if (guess2 &gt; 9) {
                System.out
                        .println("Wrong input enter only 1 number between 0-9: ");
            } else {

            }

            System.out.print("Enter your lottery pick (0-9): ");
            int guess3 = input.nextInt();

            if (guess3 &gt; 9) {
                System.out
                        .println("Wrong input enter only 1 number between 0-9: ");
            } else {
                continue;

            }

            // Show secret numbers and your numbers
            System.out.println("The Secret Numbers are " + arr[0] + (", ")
                    + arr[1] + (", ") + arr[2]);
            System.out.println("Your Numbers are " + guess1 + (", ") + guess2
                    + (", ") + guess3);

            if (guess1 == arr[0] &amp;&amp; guess2 == arr[1] &amp;&amp; guess3 == arr[2]) {
                System.out
                        .println("Three Matching in Exact order, You Won $100,000 ");
            } else if ((

            (guess1 == arr[1] || guess1 == arr[2])
                    &amp;&amp; (guess2 == arr[0] || guess2 == arr[2]) &amp;&amp; (guess3 == arr[0] || guess3 == arr[1]))

                    ||

                    ((guess1 == arr[0])
                            &amp;&amp; (guess2 == arr[1] || guess2 == arr[2]) &amp;&amp; (guess3 == arr[1] || guess3 == arr[2]))

                    ||

                    ((guess2 == arr[1])
                            &amp;&amp; (guess3 == arr[0] || guess3 == arr[1]) &amp;&amp; (guess1 == arr[0] || guess1 == arr[2]))

                    ||

                    ((guess3 == arr[2])
                            &amp;&amp; (guess2 == arr[0] || guess2 == arr[2]) &amp;&amp; (guess1 == arr[1] || guess1 == arr[0])))

            {
                System.out
                        .println("Three Matching in Different order, You Won $10,000 ");
            } else if (

            ((guess1 == arr[0] || guess1 == arr[1] || guess1 == arr[2]) &amp;&amp; (guess2 == arr[0]
                    || guess2 == arr[1] || guess2 == arr[2]))
                    &amp;&amp; (guess3 != arr[0] || guess3 != arr[1] || guess3 != arr[2])

                    ||

                    ((guess1 == arr[0] || guess1 == arr[1] || guess1 == arr[2]) &amp;&amp; (guess3 == arr[0]
                            || guess3 == arr[1] || guess3 == arr[2]))
                    &amp;&amp; (guess2 != arr[0] || guess2 != arr[1] || guess2 != arr[2])

                    ||

                    ((guess2 == arr[0] || guess2 == arr[1] || guess2 == arr[2]) &amp;&amp; (guess3 == arr[0]
                            || guess3 == arr[1] || guess3 == arr[2]))
                    &amp;&amp; (guess1 != arr[0] || guess1 != arr[1] || guess1 != arr[2])

            ) {
                System.out.println("Any Two Numbers Matching, You Win $1,000 ");
            } else if ((guess1 == arr[0] || guess1 == arr[1] || guess1 == arr[2])
                    &amp;&amp; (guess2 != arr[0] || guess2 != arr[1] || guess2 != arr[2])
                    &amp;&amp; (guess3 != arr[0] || guess3 != arr[1] || guess3 != arr[2])

                    ||

                    (guess2 == arr[0] || guess2 == arr[1] || guess2 == arr[2])
                    &amp;&amp; (guess1 != arr[0] || guess1 != arr[1] || guess1 != arr[2])
                    &amp;&amp; (guess3 != arr[0] || guess3 != arr[1] || guess3 != arr[2])

                    ||

                    (guess3 == arr[0] || guess3 == arr[1] || guess3 == arr[2])
                    &amp;&amp; (guess1 != arr[0] || guess1 != arr[1] || guess1 != arr[2])
                    &amp;&amp; (guess2 != arr[0] || guess2 != arr[1] || guess2 != arr[2])

            )// close if
            {
                System.out.println("Any One Number Matching, You Win $10 ");
            } else {
                System.out.println("You Lose Sorry ");
            }

            System.out.println("Would you like to play again? Y/N ");
            PlayAgain = input.next();
            PlayAgain = PlayAgain.toUpperCase();

        }// end of while loop
    } // end of main

} // end of class
</code></pre>

<p>sorry if code is hard to read im a beginner at this stuff and i did use the ctrl + shift + f to format the code before posting.</p>
