java随机数组

Question

我想让问题随机，当我给出答案时比较它们是否是正确答案？有人可以给我一点帮助吗？

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.util.Random;
public class Main {
public static void main(String[] args) {


      String[] aa = { "question aa" };
      String[] bb = { "question bb"};
      String[] cc = { "question cc"};
      String[] dd = { "question dd"};

      String[] e = { "answer to question aa" };
      String[] f = { "answer to question bb"};
      String[] g = { "answer to question cc"};
      String[] h = { "answer to question dd"};



     // should be here the random question

      System.out.print("Enter your answer: ");

      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

  String userAnswer = null;

  try {
     userAnswer = br.readLine();
  } catch (IOException ioe) {
     System.out.println("IO error trying to read your answer!");
     System.exit(1);
  }

  System.out.println("Thanks for the answer, " + userAnswer);

}

Answer 1

class QuestionAnswer{
String q;
String a;
//getters/setters and const.
}

1 创建 DS，因为您的问题集较小，建议保留在内存中

List<QuestionAnswer> lst = new ArrayList<QuestionAnswer>();
lst.add(new QuestionAnswer("Question1","Answer1")); 
lst.add(new QuestionAnswer("Question2","Answer2")); 
lst.add(new QuestionAnswer("Question3","Answer3")); 

2 生成 0 到 list.size() 之间的随机整数

Random r = new Random();
int index = r.nextInt(lst.size());

3获取问题并打印并接受用户的回答

System.out.println(lst.get(index).getQ());
Scanner in = new Scanner(System.in);
// Reads a single line from the console 
String answer = in.nextLine();

4将用户的答案与列表进行比较

if(answer.equalsIgnoreCase(lst.get(index).getA())){
   System.out.println("You are correct. !!");
}