Rock Paper Scissors in Java

// Rock Paper Scissors
// Created in Java
// Written by Arman Shah
import java.util.*;

import javax.swing.JOptionPane;
public class RPS {

    public static void main(String[] args) {

        // User chooses rps

        String choice= JOptionPane.showInputDialog ("Choose rock, paper, or scissors:");

        // generate rps based off of random number
        // declare random

        Random r = new Random();

        // declare choice 1-3
        int compchoice = r.nextInt(2) +1;

        // computer chooses rps
        String rps;

        if (compchoice ==1) {
            rps = "rock";
        }
        else if (compchoice ==2) {
            rps = "paper";
        }
        else rps = "scissors";


        // compare user to computer

        if (choice.equals(rps)) {
            JOptionPane.showMessageDialog(null,  "You chose: " + choice + "\nComputer chose: "+rps+ "\nIt's a tie!");
        }
        else {
            if ((choice.equals("rock")) && (rps.equals("scissors"))); {
                JOptionPane.showMessageDialog(null,  "You chose: rock" + "\nComputer chose: scissors"+ "\nYou won!");
                System.exit(0);
                }
            if ((choice.equals("rock")) && (rps.equals("paper"))); {
                JOptionPane.showMessageDialog(null,  "You chose: rock" + "\nComputer chose: paper"+ "\nYou lost!");
                System.exit(0);
            }
            if ((choice.equals("paper")) && (rps.equals("scissors"))); {
                JOptionPane.showMessageDialog(null,  "You chose: paper" + "\nComputer chose: scissors"+ "You lost!");
            }   System.exit(0);
            if ((choice.equals("paper")) && (rps.equals("rock"))); {
                JOptionPane.showMessageDialog(null,  "You chose: paper" + "\nComputer chose: rock"+ "You won!");
            }   System.exit(0);
            if ((choice.equals("scissors")) && (rps.equals("rock"))); {
                JOptionPane.showMessageDialog(null,  "You chose: scissors" + "\nComputer chose: rock"+ "You lost!");
            }   System.exit(0);
            if ((choice.equals("scissors")) && (rps.equals("paper"))); {
                JOptionPane.showMessageDialog(null,  "You chose: scissors" + "\nComputer chose: paper"+ "You won!");
            }   System.exit(0);

        }



    }

}