Rock Paper Scissors JAVA Not doing what I want [duplicate]

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Can anyone tell me why this does not work? I keep getting the else statement returned. import java.util.Scanner;

public class RockPaperScissors {
public static void main(String[] args) {

    Scanner input = new Scanner(System.in);

    String userChoice;
    int rock = 1, paper = 2, scissors = 3, userChoiceNum = 0;
    double compChoice;

    System.out.println("Rock, paper, or scissors?");
        userChoice = input.nextLine();

    compChoice = Math.random() * 3 + 1;

    compChoice = (int)(compChoice * 10)/10;

    if (userChoice == "rock" || userChoice == "Rock") {
        userChoiceNum = userChoiceNum + 1;
    }
    else if (userChoice == "Paper" || userChoice == "paper") {
        userChoiceNum = userChoiceNum + 2;
    }
    else if (userChoice == "Scissors" || userChoice == "scissors") {
        userChoiceNum = userChoiceNum + 3;
    }
    else {
        System.out.println("That doesn't exist in this game!");
    }

}

}

I just want it so that when the user inputs rock or any other one, it assigns an int value with the corresponding number for the one the user entered. I do not have any idea why it is not working. Please help.