在循环中多次使用扫描仪 Java

Question

I'm new in this, i'm trying to write a code which stores user input in a array of n length (the length is also decided by the user). So I decided to use a while loop to use Scanner n times, so that each time the user could store an String in that location as the loop advances.

But when I run the code, it just prints the statements don't letting me (or the user) to input the String .

    public static void main(String[] args) {

        String[] contadores;

        Scanner cont= new Scanner(System.in);
        System.out.println("Input the length of the array + 1: ");
        int cuenta = cont.nextInt();
     // Thread.sleep(4000);
        contadores = new String[cuenta];

        Scanner d = new Scanner(System.in);

        int i=0;
        while (i<= (contadores.length-1)) {
            System.out.println("Input the word in the space: "+(i));
            String libro = d.toString();

            contadores[i] = libro;
            i++;
        }

When I run it, the output is:

Input the length of the array + 1: 
3
Input the word in the space: 0
Input the word in the space: 1
Input the word in the space: 2

As you see it doesn't give me enough time to input something, I don't know if it JDK (I think not), or it is because is inside the main , I tried using Thread.sleep(4000); but the output is an error Unhandled exception type InterruptedException .

Answer 1

The problem is that you are not scanning inside the while loop. You need to scan the words the way you have scanned the integer. Instead of using d.next() , you've used d.toString() .

Do it as follows:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        String[] contadores;

        Scanner cont = new Scanner(System.in);
        System.out.print("Input the length of the array: ");
        int cuenta = cont.nextInt();
        contadores = new String[cuenta];

        int i = 0;
        while (i < contadores.length) {
            System.out.print("Input the word for the index " + (i) + ": ");
            String libro = cont.next();
            contadores[i] = libro;
            i++;
        }

        // Display the array
        for (String s : contadores) {
            System.out.println(s);
        }
    }
}

A sample run:

Input the length of the array: 4
Input the word for the index 0: Hello
Input the word for the index 1: World
Input the word for the index 2: Good
Input the word for the index 3: Morning
Hello
World
Good
Morning

Also, note that I've used only one instance of Scanner . You do not need two instances of Scanner . You can reuse the same instance of Scanner everywhere in your program.