不知道为什么 while 循环不循环

Question

I am trying to prompt the user to enter 5 integers but it won't loop more than once. I don't know why this is happening and couldn't resolve the error by myself

Code:

package com.company;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner s= new Scanner(System.in);

        int counter= 0;
        Boolean inputOK;
        int iInput;

        int data[]= new int[5];

       // while (counter<5);

     do {

         System.out.println(" Please enter an integer");

         while (!s.hasNextInt()) {
             System.out.println("Invalid input");
             System.out.println("Please Enter an integer value");
             s.next();}

            iInput=s.nextInt();

             if (iInput < -10 || iInput > 10) {
                 System.out.println("Not a valid integer. Please enter a integer between -10 and 10");
                 inputOK = false;
             } else {
                 inputOK = true;

             }

         System.out.println("before while loop"+ inputOK);
         } while (!inputOK);
        counter++;
        System.out.println("counter value is"+ counter);



     }
}

Answer 1

If you follow your code, you can see that when inputOK is true , there is no loop to get back to. It looks like you had some counter in mind, but you ended up not using it. The following code does what I think you intended with your code:

Scanner sc = new Scanner(System.in);
int[] data = new int[5];
for(int i = 0; i < data.length; i++) {
    System.out.println("Please enter an integer.");
    
    // Skip over non-integers.
    while(!sc.hasNextInt()) {
        System.out.println("Invalid input: " + sc.next());
    }
    
    // Read and store the integer if it is valid.
    int nextInt = sc.nextInt();
    if(nextInt < -10 || nextInt > 10) {
        
        // Make the for loop repeat this iteration.
        System.out.println("Not a valid integer. Please enter an integer between -10 and 10.");
        i--;
        continue;
    }
    data[i] = nextInt;
}
for(int i = 0; i < data.length; i++) {
    System.out.println("data[" + i + "] = " + data[i]);
}