BAEL-5379-create-simple-rock-paper-scissors-game (#11846)

Co-authored-by: tienvn4 <tienvn4@ghtk.co>

core-java-modules/core-java-8-2/src/main/java/com/baeldung/game/RockPaperScissorsGame.java

@@ -0,0 +1,66 @@
+package com.baeldung.game;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Random;
+import java.util.Scanner;
+
+class RockPaperScissorsGame {
+
+    private static Map<Integer, String> movesMap = new HashMap<Integer, String>() {{
+        put(0, "rock");
+        put(1, "paper");
+        put(2, "scissors");
+    }};
+
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+        int wins = 0;
+        int losses = 0;
+
+        System.out.println("Welcome to Rock-Paper-Scissors! Please enter \"rock\", \"paper\", \"scissors\", or \"quit\" to exit.");
+
+        while (true) {
+            System.out.println("-------------------------");
+            System.out.print("Enter your move: ");
+            String playerMove = scanner.nextLine();
+
+            if (playerMove.equals("quit")) {
+                System.out.println("You won " + wins + " times and lost " + losses + " times.");
+                System.out.println("Thanks for playing! See you again.");
+                break;
+            }
+
+            if (!movesMap.containsValue(playerMove)) {
+                System.out.println("Your move isn't valid!");
+                continue;
+            }
+
+            String computerMove = getComputerMove();
+
+            if (playerMove.equals(computerMove)) {
+                System.out.println("It's a tie!");
+            } else if (isPlayerWin(playerMove, computerMove)) {
+                System.out.println("You won!");
+                wins++;
+            } else {
+                System.out.println("You lost!");
+                losses++;
+            }
+        }
+    }
+
+    private static boolean isPlayerWin(String playerMove, String computerMove) {
+        return playerMove.equals("rock") && computerMove.equals("scissors")
+                || (playerMove.equals("scissors") && computerMove.equals("paper"))
+                || (playerMove.equals("paper") && computerMove.equals("rock"));
+    }
+
+    private static String getComputerMove() {
+        Random random = new Random();
+        int randomNumber = random.nextInt(3);
+        String computerMove = movesMap.get(randomNumber);
+        System.out.println("Computer move: " + computerMove);
+        return computerMove;
+    }
+}