I've clearly declared my variable, what's the issue?

I'm trying to build a Rock, Paper, Scissor program: And this is the error I get when it's running:

Lab03.java:38: error: variable ComputerInput might not have been initialized
  System.out.println("The Computer plays: " + ComputerInput); //Prints computer's selection. 

So how do I properly make this work? Also any tips and advice would be appreciated. Thank you!

import java.util.Scanner;
import java.util.Random;
import java.util.*;

public class Lab03
{
 public static void main (String [] args)
{
  Scanner scan = new Scanner(System.in); //Prepares for Keyboard input

  String HumanInput;
  String ComputerInput; // Vars that will carry the rock, paper, scissor selection.
  int ComputerChoice, HumanChoice; //

  System.out.println("ROCK, PAPER, SCISSORS!n" + 
                  "R = Rock, P = Paper, and S = Scissors n" + "Please enter your move:"); //Prompts user for a selection.

  HumanInput = scan.nextLine(); //Stores input
  HumanInput = HumanInput.toUpperCase(); //Transform input to upperclass for standardization

  Random generator = new Random();
  ComputerChoice = generator.nextInt(3); // Range of choice are 0, 1, and 3.

  if (ComputerChoice == 0) //Nested if statement to convert randomly generated number to a rock, paper, scissor selection.
     ComputerInput = "R";
  else if (ComputerChoice == 1)
     ComputerInput = "P";
  else if (ComputerChoice == 2)
     ComputerInput = "S";      

  System.out.println("The Computer plays: " + ComputerInput); //Prints computer's selection. 

  System.out.println("Coded by Benny Villegas");
   }
}