Question Program

 import java.lang.*;

import java.io.*;

class Questions {

    public String[][] qpa; // Questions and possible answers

    public String[][] qca; // Correct answers

    Questions() throws IOException {

        qpa = new String[10][5]; // Initialize the question and answers array

        /* Questions and Objectives */

        qpa[0][0] = "What is the size of an int in Java?"; 

        qpa[0][1] = "1. 2 bytes"; 

        qpa[0][2] = "2. 4 bytes"; 

        qpa[0][3] = "3. 8 bytes"; 

        qpa[0][4] = "4. Depends on the system";

        qpa[1][0] = "Which of these is a valid declaration of a char?"; 

        qpa[1][1] = "1. char ch = 'ab';"; 

        qpa[1][2] = "2. char ch = '\\u0022';"; 

        qpa[1][3] = "3. char ch = 23;"; 

        qpa[1][4] = "4. char ch = '\\n';";

        qpa[2][0] = "What is the output of the following code? System.out.println(10 + 20 + \"30\");"; 

        qpa[2][1] = "1. 3030"; 

        qpa[2][2] = "2. 102030"; 

        qpa[2][3] = "3. 1030"; 

        qpa[2][4] = "4. 3030";

        qpa[3][0] = "Which of the following is not a Java keyword?"; 

        qpa[3][1] = "1. static"; 

        qpa[3][2] = "2. Boolean"; 

        qpa[3][3] = "3. void"; 

        qpa[3][4] = "4. private";

        qca = new String[10][2];

        /* Questions and Correct Answers */

        qca[0][0] = "What is the size of an int in Java?"; 

        qca[0][1] = "2. 4 bytes";

        qca[1][0] = "Which of these is a valid declaration of a char?"; 

        qca[1][1] = "2. char ch = '\\u0022';";

        qca[2][0] = "What is the output of the following code? System.out.println(10 + 20 + \"30\");"; 

        qca[2][1] = "1. 3030";

        qca[3][0] = "Which of the following is not a Java keyword?"; 

        qca[3][1] = "2. Boolean";

    }

}

public class qu {

    public static void main(String[] args) throws IOException {

        DataInputStream in = new DataInputStream(System.in);

        int x, correct = 0, wrong = 0, i, j;

        String ans[] = new String[10];

        Questions q = new Questions();

        System.out.println("JAVA QUIZ");

        System.out.println(" ");

        /* For loop to display questions and read the answer from the user */

        for (i = 0; i < 4; i++) {

            for (j = 0; j < 5; j++) {

                System.out.println(q.qpa[i][j]);

            }

            System.out.println("Your answer:");

            x = Integer.parseInt(in.readLine());

            ans[i] = q.qpa[i][x];

        }

        /* Calculate correct answers */

        for (i = 0; i < 4; i++) {

            if (q.qca[i][1].equals(ans[i])) {

                correct++;

            } else {

                wrong++;

            }

        }

        /* Printing the correct answers and user-selected answers */

        System.out.println("CORRECT ANSWERS");

        for (i = 0; i < 4; i++) {

            System.out.println();

            System.out.println(q.qpa[i][0]);

            System.out.println("Correct answer: " + q.qca[i][1]);

            System.out.println("Your answer: " + ans[i]);

      }

        System.out.println("Correct = " + correct + "\tWrong = " + wrong);

    }

}