网络选拔赛题库系统java实例

以下是一个基本的网络选拔赛题库系统的Java示例：

import java.util.ArrayList;
import java.util.Scanner;

public class ContestSystem {
    
    // A list of ContestQuestion objects to store the questions in the contest
    private static ArrayList<ContestQuestion> contestQuestions = new ArrayList<>();
    
    // A Scanner object to read input from the user
    private static Scanner scanner = new Scanner(System.in);
    
    public static void main(String[] args) {
        
        // Display a welcome message
        System.out.println("Welcome to the Contest Question System!");
        
        // Prompt the user to enter the number of questions in the contest
        System.out.print("Please enter the number of questions in the contest: ");
        int numQuestions = scanner.nextInt();
        
        // Read in each question and add it to the contestQuestions list
        for (int i = 1; i <= numQuestions; i++) {
            System.out.println("Question " + i + ":");
            System.out.print("Enter the question text: ");
            String questionText = scanner.next();
            System.out.print("Enter the answer: ");
            String answer = scanner.next();
            ContestQuestion question = new ContestQuestion(questionText, answer);
            contestQuestions.add(question);
        }
        
        // Display the menu of options
        System.out.println();
        System.out.println("Please select an option from the menu below:");
        System.out.println("1. Take the contest");
        System.out.println("2. View the questions in the contest");
        System.out.println("3. Exit");
        
        // Read the user's choice from the keyboard
        int choice = scanner.nextInt();
        
        // Process the user's choice
        switch (choice) {
            case 1:
                takeContest();
                break;
            case 2:
                viewQuestions();
                break;
            case 3:
                System.out.println("Goodbye!");
                break;
            default:
                System.out.println("Invalid choice. Please try again.");
                break;
        }
        
        // Close the Scanner object
        scanner.close();
    }
    
    public static void takeContest() {
        // Initialize the user's score to 0
        int score = 0;
        
        // Iterate over each question in the contestQuestions list
        for (int i = 0; i < contestQuestions.size(); i++) {
            ContestQuestion question = contestQuestions.get(i);
            System.out.println("Question " + (i+1) + ": " + question.getQuestionText());
            System.out.print("Your answer: ");
            String userAnswer = scanner.next();
            if (userAnswer.equals(question.getAnswer())) {
                System.out.println("Correct!");
                score++;
            } else {
                System.out.println("Incorrect. The correct answer was: " + question.getAnswer());
            }
        }
        
        // Display the user's final score
        System.out.println("Your final score is: " + score + "/" + contestQuestions.size());
    }
    
    public static void viewQuestions() {
        // Iterate over each question in the contestQuestions list and display the question text
        for (int i = 0; i < contestQuestions.size(); i++) {
            ContestQuestion question = contestQuestions.get(i);
            System.out.println("Question " + (i+1) + ": " + question.getQuestionText());
        }
    }

}

class ContestQuestion {
    
    private String questionText;
    private String answer;
    
    public ContestQuestion(String questionText, String answer) {
        this.questionText = questionText;
        this.answer = answer;
    }
    
    public String getQuestionText() {
        return questionText;
    }
    
    public String getAnswer() {
        return answer;
    }
    
}

该示例实现了一个简单的网络选拔赛题库系统，用户可以添加他们想要的问题和答案，并选择参加比赛或查看问题列表。在参加比赛时，系统会迭代每个问题，提示用户输入答案，然后根据答案是否正确更新用户的得分。在查看问题列表时，系统会显示每个问题的文本。请注意，这里省略了一些边缘情况（例如，用户输入的不正确的选择或答案），这是为了简化示例。