系统随机生成一个1-100之间的数，然后让玩家猜该数。若玩家猜对该数，游戏则结束；若玩家猜得不对，则计算机告知玩家，数字猜大了还是小了；并提示玩家是否继续游戏，玩家点击确定则继续游戏，否则退出游戏。

要实现这个简单的猜数字游戏，你可以使用Java编写控制台应用程序。以下是一个基本的伪代码步骤：

1. 导入必要的库（如果需要）：

import java.util.Random;
import java.util.Scanner;

2. 创建`Random`对象来生成随机数：

Random random = new Random();
int secretNumber = random.nextInt(100) + 1; // 生成1到100的随机整数

3. 使用`Scanner`获取用户的输入：

Scanner scanner = new Scanner(System.in);

4. 游戏循环，直到猜对或玩家选择退出：

boolean continueGame = true;

while (continueGame) {
    System.out.println("Guess a number between 1 and 100:");
    int guess = scanner.nextInt();

    if (guess == secretNumber) {
        System.out.println("Congratulations, you guessed the number!");
        continueGame = false;
    } else if (guess < secretNumber) {
        System.out.println("Too low! Guess again.");
    } else {
        System.out.println("Too high! Guess again.");
    }

    System.out.print("Do you want to continue? (yes/no): ");
    String choice = scanner.next();
    continueGame &= choice.equalsIgnoreCase("yes");
}

5. 游戏结束后关闭`Scanner`：

scanner.close();

6. 最后，确保在适当的地方处理异常。

完整的代码示例（简化版）：

public class GuessingGame {
    public static void main(String[] args) {
        Random random = new Random();
        int secretNumber = random.nextInt(100) + 1;
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("Guess a number between 1 and 100:");
            int guess = scanner.nextInt();

            if (guess == secretNumber) {
                System.out.println("Congratulations, you guessed the number!");
                break;
            } else if (guess < secretNumber) {
                System.out.println("Too low! Guess again.");
            } else {
                System.out.println("Too high! Guess again.");
            }

            System.out.print("Do you want to continue? (yes/no): ");
            String choice = scanner.next().toLowerCase();
            if (!choice.equals("yes")) {
                break;
            }
        }

        scanner.close();
    }
}