Hello, in my code I'm trying to implement my scanner into my if statement so that if the user responds with "add" then it will cause my addition method to run. However I keep getting this runtime error. "Exception in thread "main" java.lang.NullPointerException at ArithmeticOperators.main(ArithmeticOperators.java:14)

I have no idea what causing this exception and was wondering if someone could tell me. Below is a copy of my code.

import java.util.*;

public class ArithmeticOperators{

private static Scanner userChoice;

public static void main(String[]args){

System.out.println("Please choose to add, subtract,"); System.out.println("multiply, or divide!"); if(userChoice.equals("add")){ Addition(result);} else{ System.out.println("thanks for trying"); }

} public static int result; public static int Addition(int list){ userChoice = new Scanner(System.in); LinkedList aL = new LinkedList(); int a = userChoice.nextInt(); int b = userChoice.nextInt(); int c = userChoice.nextInt(); aL.add(a); aL.add(b); aL.add(c); result = a + b + c; System.out.println("The elements of your list are:" ); System.out.println(result); return result; }

}

e eclipse ava Arithmeticop java Pse erators/src/Arithmeticoperators File Edit Source Refactor Navigate Search Project Run Window Help project eticoperators java Package Exp 19 20 public static int result; AminoAcids 21 ArithmeticOperators 22 public static int Addition (int list) 23 v deraul package 24 user Choice new Scanner (System. in 25 etioope LinkedList Ari ava Apylialion] CAPI e 18.0 121M avaw.exe (Feb 22, 2017 4:3449 PM) Please choose to add, subtract, multiply, or divide Exception in thread "main" ava lan NullPointerException at Arithmeticoperators .main (Arithmeticoperators iava-14) Ask me anything Quick Access 4:4. 2/22/2017