CODEWITHSUNDEEP
javarandomarraylist
james13
james13

Reputation: 45

Printing a randomly removed element from an array list, then printing out the updated array list

So I'm having problem printing out a randomly chosen element from an arraylist and then printing the updated arraylist without that random element in it. Every time I print the updated list, it gives me the arraylist minus the randomly chosen element and minus another element. 

import java.util.ArrayList;
import java.util.Scanner;
import java.util.Random;

public class LabPartyGuests   {
   public static void main(String[] args) {
      int numberOfGuests = 4;
      Scanner input = new Scanner(System.in);
      Random rand = new Random();
      ArrayList<String> guestList = new ArrayList<String>();

      System.out.println("Please enter 4 guests: ");
      System.out.print("guest1: ");
      String guest1 = input.nextLine();
      System.out.print("guest2: ");
      String guest2 = input.nextLine();
      System.out.print("guest3: ");
      String guest3 = input.nextLine();
      System.out.print("guest4: ");
      String guest4 = input.nextLine();

      for (int i = 0; i <= 0; i++)   {
         guestList.add(guest1);
         guestList.add(guest2);
         guestList.add(guest3);
         guestList.add(guest4);
      }
      System.out.println();
      System.out.print("Guest list: " + guestList);
      System.out.println();

      guestList.remove(rand.nextInt(4));
      System.out.printf("%s can't come %n", guestList.remove(rand.nextInt(4)));
      for (int i = 0; i < guestList.size(); i++)   {
         guestList.size();
      }  
      System.out.print(guestList);
   }
}

Upvotes: 0

Views: 955

Answers (1)

Eran
Eran

Reputation: 394126

You are removing two elements :

  guestList.remove(rand.nextInt(4)); // one
  System.out.printf("%s can't come %n", guestList.remove(rand.nextInt(4))); // two

If you want to print the removed element, store the output of the first remove instead of calling remove twice :

  String removed = guestList.remove(rand.nextInt(4));
  System.out.println("removed element " + removed);

Upvotes: 1

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