测验-如何使问题保存在数组中，以便使用方法中的循环进行回答？

Question

I want to place the array questions in a loop in a method.

  class QuizMethods{
    String [] questions = new String [20];
    String [] answers   = new String [20];
    String [] correctAnswers = new String [20];
    int score; 
    void fillArrays(){   

   questions[0] = " Who is the lead guitarist of Led Zeppelin?";  
   correctAnswers[0] = "Jimmy Page";

   questions[1] = " Who is the lead singer of Led Zeppelin?"; 
   correctAnswers[1]= "Robert Plant";

   questions[2] = " Who is the lead guitarist of Pink Floyd?";  
   correctAnswers[2] = "David Gilmour";

   questions[3] = " Who is the bassist and main lyricist of Pink Floyd?"; 
   correctAnswers[3]= "Roger Waters";

   questions[4] = " Under which category of music are Pink Floyd entitled too?";  
   correctAnswers[4] = "Soft Rock";

   questions[5] = " Under which category of music are Metallica entitled too?"; 
   correctAnswers[5]= "Trash Metal";

   questions[6] = " Who is the lead guitarist of Metallica?";  
   correctAnswers[6] = "Kirk Hammet";

   questions[7] = " Who is the lead singer and rhythm guitarist of Metallica?"; 
   correctAnswers[7]= "James Hetfield";

   questions[8] = " Who is the lead guitarist of Guns n Roses?";  
   correctAnswers[8] = "Slash";

   questions[9] = " Who is the lead singer of Guns n Roses?"; 
   correctAnswers[9]= "Axl Rose";

   questions[13] = " Under which category of music are Guns n Roses entitled too?"; 
   correctAnswers[13]= "Hard Rock";

   questions[11] = " Who is the bassist of Guns n Roses?"; 
   correctAnswers[11]= "Duff McKagan";

   questions[12] = " Name the biggest and most sold album of Pink Floyd";  
   correctAnswers[12] = "The Wall";

   questions[13] = " Under which category of music are ZZ Top entitled too?"; 
   correctAnswers[13]= "Blues Rock";

   questions[14] = " Who is the lead guitarist and vocalist of ZZ Top?";  
   correctAnswers[14] = "Billy Gibbons";

   questions[15] = " Who is considered as the king of blues?"; 
   correctAnswers[15]= "BB King";

   questions[16] = " Who was the lead singer for the popular band Queen?";  
   correctAnswers[16] = "Freddie Mercury";

   questions[17] = " Who was the lead singer for the Heavy Metal band Black Sabbath?"; 
   correctAnswers[17]= "Ozzy Osbourne";

   questions[18] = " Who is the lead guitarist of Dire Straits?";  
   correctAnswers[18] = "Mark Knopfler";

   questions[19] = " Complete the sentence.Alphaville released the song named _______ _______ in September 1984."; 
   correctAnswers[19]= "Forever Young";
}
 void takeQuiz(){
    // loop using arrays in this method.
}
void menu(){
    System.out.println("1. Take Quiz");
    System.out.println("2. Quiz Results");
    System.out.println("3. Performance Comment");
    System.out.println("4. Exit");
    System.out.println("Choose from the above");
    byte menu = Keyboard.readByte();
    switch(menu){

        case 1 : 
        takeQuiz();

        case 2 :
        quizResults();

        case 3 :
        performanceComment();

        case 4 : 
        exit();

        }
    }
}

I used the menu for the user to choose what he wants to do. All I need to know is how can I place the array in a loop in the method. Any help is appreciated.

Answer 1

You can loop over an array using while or for-loop. Here I have used the for-loop to print the quiz question and store the user response in answers array.

Also it will be good if you use List interface implementations for your program.

void takeQuiz(){

    Scanner keyboard = new Scanner(System.in);

    for(int i=0;i<questions.length;i++)
    {
        System.out.println(questions[i]);
        answers[i]= keyboard.nextLine();
    }
}

Answer 2

You need a for loop . Because the index is important, you cannot use enhanced for loops.

void takeQuiz()
{
     Scanner in = new Scanner(System.in);
     String answer;

     for(int i = 0; i < questions.size(); i++)
     {
         System.out.print(questions[i] + "\nAnswer: ");
         answer = in.next();
         answers[i] = answer;

         if(answer.equalsIgnoreCase(correctAnswers[i])
         {
             score++;
         }
         else
         {
            score--;
         }
     }
}

Your switch statement also needs breaks to get out of the switch

switch(menu)
{
    case 1 : 
        takeQuiz();
        break;
    case 2 :
        quizResults();
        break;
    case 3 :
        performanceComment();
        break;
    case 4 : 
        exit(); 
        break; // Do not need break if exit() used `System.exit(0)`
    case default: // Switch statements should include a `default` declaration for what to do when no cases are valid
        exit();
        break;
}