Here’s the complete implementation of the RockPaperScissors game using the provided structure, along with the Randomizer class:<\/p>\n\n\n\n
java<\/p>\n\n\n\n
import java.util.Scanner;\n\npublic class RockPaperScissors {\n private static final String USER_PLAYER = \"User wins!\";\n private static final String COMPUTER_PLAYER = \"Computer wins!\";\n private static final String TIE = \"Tie\";\n\n public static String getWinner(String user, String computer) {\n if (user.equals(computer)) {\n return TIE;\n } else if ((user.equals(\"rock\") && computer.equals(\"scissors\")) ||\n (user.equals(\"paper\") && computer.equals(\"rock\")) ||\n (user.equals(\"scissors\") && computer.equals(\"paper\"))) {\n return USER_PLAYER;\n } else {\n return COMPUTER_PLAYER;\n }\n }\n\n public static void main(String[] args) {\n Scanner scanner = new Scanner(System.in);\n while (true) {\n System.out.print(\"Enter your choice (rock, paper, or scissors): \");\n String userChoice = scanner.nextLine().toLowerCase();\n if (userChoice.equals(\"\")) {\n System.out.println(\"Thanks for playing!\");\n break;\n }\n\n int computerNum = Randomizer.nextInt(1, 3);\n String computerChoice = \"\";\n if (computerNum == 1) {\n computerChoice = \"rock\";\n } else if (computerNum == 2) {\n computerChoice = \"paper\";\n } else {\n computerChoice = \"scissors\";\n }\n\n System.out.println(\"User: \" + userChoice);\n System.out.println(\"Computer: \" + computerChoice);\n System.out.println(getWinner(userChoice, computerChoice));\n }\n scanner.close();\n }\n}\n\nclass Randomizer {\n public static int nextInt() {\n return (int)(Math.random() * 10) + 1;\n }\n\n public static int nextInt(int min, int max) {\n return (int)(Math.random() * (max - min + 1)) + min;\n }\n}\n<\/code><\/pre>\n\n\n\n\ud83e\udde0 Explanation<\/strong><\/p>\n\n\n\nThis program simulates a rock-paper-scissors game between a user and the computer. The game continues in a loop until the user presses enter without typing a choice. The core logic is divided into two classes: RockPaperScissors<\/code> for the game mechanics and Randomizer<\/code> for generating random numbers.<\/p>\n\n\n\nThe getWinner<\/code> method determines the outcome of each round. It compares the user’s and computer’s choices. If both choices are the same, it returns “Tie”. If the user’s choice beats the computer’s according to the rules of the game, it returns “User wins!”. Otherwise, it returns “Computer wins!”. This method uses conditional logic to evaluate all possible outcomes.<\/p>\n\n\n\nIn the main<\/code> method, the program prompts the user for input. It reads the user’s choice and converts it to lowercase to ensure consistency. If the input is empty, the loop breaks and the game ends with a thank-you message.<\/p>\n\n\n\nThe computer’s choice is generated using the Randomizer.nextInt(1, 3)<\/code> method. This produces a random integer between 1 and 3, which is then mapped to “rock”, “paper”, or “scissors”. This ensures that the computer’s choice is unpredictable and fair.<\/p>\n\n\n\n
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