使用java设计一个游戏，电脑和人玩剪刀石头布游戏，并且能显示游戏结果，比如人出了石头，电脑出了剪子， 则显示人赢了，否则显示电脑赢了，或者平局。比赛次数至少为5次，将每一局的游戏结果写入 result.txt文件。

很高兴能够为您提供代码，这是一个基于面向对象编程的实现方案。

首先，我们需要定义一个手势类，它包含三个常量：剪刀、石头和布。我们还可以添加一个方法来将手势表示为字符串，以便显示游戏结果。

public class Gesture {
    public static final int SCISSORS = 0;
    public static final int ROCK = 1;
    public static final int PAPER = 2;

    private int value;

    public Gesture(int value) {
        this.value = value;
    }

    public int getValue() {
        return value;
    }

    public String toString() {
        switch (value) {
            case SCISSORS:
                return "scissors";
            case ROCK:
                return "rock";
            case PAPER:
                return "paper";
            default:
                return "";
        }
    }
}

接下来，我们需要定义一个游戏类，它包含玩家和电脑的手势，以及比较手势的方法。

public class Game {
    private Gesture playerGesture;
    private Gesture computerGesture;

    public void setPlayerGesture(Gesture gesture) {
        this.playerGesture = gesture;
    }

    public void setComputerGesture(Gesture gesture) {
        this.computerGesture = gesture;
    }

    public String compareGestures() {
        if (playerGesture.getValue() == computerGesture.getValue()) {
            return "Draw!";
        } else if ((playerGesture.getValue() == Gesture.SCISSORS && computerGesture.getValue() == Gesture.PAPER)
                || (playerGesture.getValue() == Gesture.ROCK && computerGesture.getValue() == Gesture.SCISSORS)
                || (playerGesture.getValue() == Gesture.PAPER && computerGesture.getValue() == Gesture.ROCK)) {
            return "You win!";
        } else {
            return "Computer wins!";
        }
    }
}

然后，我们需要编写一个主程序来实现游戏的流程。在每一轮游戏中，先让玩家输入手势，再获取电脑的手势并进行比较，最后输出游戏结果并将它写入 result.txt 文件。

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    Game game = new Game();
    int playerScore = 0;
    int computerScore = 0;
    try {
        PrintWriter writer = new PrintWriter("result.txt");
        for (int i = 1; i <= 5; i++) {
            System.out.println("Round " + i + ":");
            System.out.print("Your gesture (0 for scissors, 1 for rock, 2 for paper): ");
            int playerGestureValue = scanner.nextInt();
            Gesture playerGesture = new Gesture(playerGestureValue);
            game.setPlayerGesture(playerGesture);
            Gesture computerGesture = new Gesture((int) (Math.random() * 3));
            game.setComputerGesture(computerGesture);
            String result = game.compareGestures();
            System.out.println("You: " + playerGesture);
            System.out.println("Computer: " + computerGesture);
            System.out.println(result);
            writer.println("Round " + i + ":");
            writer.println("You: " + playerGesture);
            writer.println("Computer: " + computerGesture);
            writer.println(result);
            if (result.equals("You win!")) {
                playerScore++;
            } else if (result.equals("Computer wins!")) {
                computerScore++;
            }
        }
        writer.println("Final score:");
        writer.println("You: " + playerScore);
        writer.println("Computer: " + computerScore);
        writer.close();
    } catch (FileNotFoundException e) {
        System.out.println("Failed to write result to file: " + e.getMessage());
    }
}

这就是一个基本的剪刀石头布游戏的实现，它可以记录每一局的游戏结果并将它们写入 result.txt 文件。您可以根据需要进行修改和扩展，例如增加更多的手势、增加计时器等等。