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正确？ 有人可以帮帮我吗？

导入 java.io.BufferedReader; 导入 java.io.IOException； 导入 java.io.InputStreamReader； 导入 java.util.Random;

公共类主{

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创建一个 DS，因为您的问题集较小且建议保留在内存中

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. !!");
} 

Answer 2

• 将问题保留在问题数组 question[][] = {aa,bb...};
• 将答案保存在答案数组arrays[][] = {e,f...};
• 生成介于 0 和 questions.length 之间的随机数

• questions[random] 和 answers[random] 应该匹配

  String[] aa = { "question aa" };
  String[] bb = { "question bb" };
  String[] cc = { "question cc" };
  String[] dd = { "question dd" };
  
  
  String[][] questions = { aa, bb, cc, 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" };
  
  
  String[][] answers = { e, f, g, h };
  
  
  int min = 0;
  int max = 5;
  int random= 0;
  
  
  random = min + (int) (Math.random() * max);
  
  
  questions[random];
  answers[random];