Adding User Input to ArrayList

You only add one String to the ArrayList. If you want it to display many Strings, first you need to add multiple Strings, probably in some sort of loop such as a for loop or while loop. Then after adding all text, create another for loop to display it all.

e.g. since this sounds like homework, much better to show what I mean in pseudo code (and shame to anyone who cheats you out of the experience of trying to code this yourself by spoon-feeding you a solution):

create array list
entry String equals ""
do this loop
   get input from user
   put it into entry String
   add entry String into array list
while entry String doesn't equal "quit"
for each item in array list
   println each item
end for loop

private static List<String> getAndPrintInputFromUser() {

    Set<String> ids = new TreeSet<String>(); //used set for making list as unique
    Scanner input = new Scanner(System.in);
    System.out.println("\nEnter each value\n" +
            "and Put an extra ENTER .");
    do{

        String x = input.nextLine();

        if(x==null || StringUtils.isEmpty(x.trim())){
            break;
        }else {
            ids.add(x);
        }

    }while(true);

    for(String id : ids)
        System.out.println(id);

    return new ArrayList<String>(ids);
}

Output:

Enter each value
and Put an extra ENTER.
TP6100010
TP6100015
TP6100019


TP6100010
TP6100015
TP6100019

Try the following to display the list and keep adding new letters:

Scanner input = new Scanner(System.in); 

ArrayList arrayListOne;
arrayListOne = new ArrayList();
ArrayList<String> letterArray = new ArrayList<String>();

while(true) {
  System.out.println("Type a string:");
  letterArray.add(input.nextLine());
  System.out.println("Number of string in array: " + letterArray.size());
  // Display eveything in the list
  displayList(letterArray);
}


// Somewhere in your class add this method
public void displayList(ArrayList letterArray) {
  for(int i = 0; i < letterArray.size(); i++) 
    System.out.println(letterArray.get(i));
}

full code:

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

public class Practice {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in); 

    ArrayList arrayListOne;
    arrayListOne = new ArrayList();
    ArrayList<String> letterArray = new ArrayList<String>();

    while(true) {
      System.out.println("Type a string:");
      letterArray.add(input.nextLine());
      System.out.println("Number of string in array: " + letterArray.size());
      // Display eveything in the list
      displayList(letterArray);
    }
  }


  public static void displayList(ArrayList letterArray) {
    for(int i = 0; i < letterArray.size(); i++) 
      System.out.println(letterArray.get(i));
  }
}