[Q#2622725][A#2623292] how to take user input in Array using java?

https://stackoverflow.com/q/2622725

how to take user input in Array using Java? i.e we are not initializing it by ourself in our program but the user is going to give its value.. please guide!!

Answer

https://stackoverflow.com/a/2623292

Here's a simple code that reads strings from stdin, adds them into List<String>, and then uses toArray to convert it to String[] (if you really need to work with arrays).

APIzation

import java.util.*;

public class UserInput {
    public static void main(String[] args) {
        List<String> list = new ArrayList<String>();
        Scanner stdin = new Scanner(System.in);

        do {
            System.out.println("Current list is " + list);
            System.out.println("Add more? (y/n)");
            if (stdin.next().startsWith("y")) {
                System.out.println("Enter : ");
                list.add(stdin.next());
            } else {
                break;
            }
        } while (true);
        stdin.close();
        System.out.println("List is " + list);
        String[] arr = list.toArray(new String[0]);
        System.out.println("Array is " + Arrays.toString(arr));
    }
}

package com.stackoverflow.api;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class Human2623292 {

  public static String[] readStandardInput() {
    List<String> list = new ArrayList<>();
    Scanner stdin = new Scanner(System.in);

    do {
      System.out.println("Current list is " + list);
      System.out.println("Add more? (y/n)");
      if (stdin.next().startsWith("y")) {
        System.out.println("Enter : ");
        list.add(stdin.next());
      } else {
        break;
      }
    } while (true);
    stdin.close();
    System.out.println("List is " + list);
    String[] arr = list.toArray(new String[0]);
    //System.out.println("Array is " + Arrays.toString(arr));
    return arr;
  }
}

package com.stackoverflow.api;

import java.util.*;

/**
 * how to take user input in Array using java?
 *
 * @author APIzator
 * @see <a href="https://stackoverflow.com/a/2623292">https://stackoverflow.com/a/2623292</a>
 */
public class APIzator2623292 {

  public static String[] takeInput() {
    List<String> list = new ArrayList<String>();
    Scanner stdin = new Scanner(System.in);
    do {
      System.out.println("Current list is " + list);
      System.out.println("Add more? (y/n)");
      if (stdin.next().startsWith("y")) {
        System.out.println("Enter : ");
        list.add(stdin.next());
      } else {
        break;
      }
    } while (true);
    stdin.close();
    System.out.println("List is " + list);
    String[] arr = list.toArray(new String[0]);
    return arr;
  }
}