用java实现剪刀石头布

以下是Java实现剪刀石头布的示例代码：

import java.util.Scanner;

public class RockPaperScissors {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int playerScore = 0;
        int computerScore = 0;
        int numGames = 0;

        System.out.println("Let's play Rock-Paper-Scissors!");
        while (true) {
            System.out.print("Enter your move (rock, paper, or scissors): ");
            String playerMove = input.nextLine().toLowerCase();
            if (!playerMove.equals("rock") && !playerMove.equals("paper") && !playerMove.equals("scissors")) {
                System.out.println("Invalid move. Please try again.");
                continue;
            }

            int computerMove = (int) (Math.random() * 3); // 0 = rock, 1 = paper, 2 = scissors
            String computerMoveStr = "";
            if (computerMove == 0) {
                computerMoveStr = "rock";
            } else if (computerMove == 1) {
                computerMoveStr = "paper";
            } else {
                computerMoveStr = "scissors";
            }

            System.out.println("Computer chose " + computerMoveStr + ".");

            if (playerMove.equals(computerMoveStr)) {
                System.out.println("Tie!");
            } else if (playerMove.equals("rock") && computerMoveStr.equals("scissors")
                    || playerMove.equals("paper") && computerMoveStr.equals("rock")
                    || playerMove.equals("scissors") && computerMoveStr.equals("paper")) {
                System.out.println("You win!");
                playerScore++;
            } else {
                System.out.println("Computer wins!");
                computerScore++;
            }

            numGames++;
            System.out.println("Your score: " + playerScore + ", Computer score: " + computerScore);
            System.out.print("Play again? (y/n): ");
            String playAgain = input.nextLine().toLowerCase();
            if (!playAgain.equals("y")) {
                break;
            }
        }

        System.out.println("Thanks for playing! Final score - Your score: " + playerScore
                + ", Computer score: " + computerScore + ", Number of games played: " + numGames);
    }
}

这个程序通过使用 `Scanner` 来获取玩家输入，然后使用 `Math.random()` 生成计算机的随机选择。然后，它使用一系列 `if` 语句来比较玩家和计算机的选择，并输出结果。程序还跟踪每个玩家和计算机的得分，以及游戏的总次数。