Added Quiz app using swing gui

Quiz-app/Quiz.json

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+[
+  {
+    "question": "What does JVM stand for?",
+    "options": ["Java Variable Manager", "Java Virtual Machine", "Java Value Method", "Java Version Manager"],
+    "correctAnswer": "Java Virtual Machine"
+  },
+  {
+    "question": "Which of the following is a valid data type in Java?",
+    "options": ["int", "String", "boolean", "All of the above"],
+    "correctAnswer": "All of the above"
+  },
+  {
+    "question": "Which keyword is used to declare a constant in Java?",
+    "options": ["const", "final", "static", "constant"],
+    "correctAnswer": "final"
+  },
+  {
+    "question": "What is the default value of a boolean in Java?",
+    "options": ["true", "false", "0", "null"],
+    "correctAnswer": "false"
+  },
+  {
+    "question": "Which method starts a thread in Java?",
+    "options": ["run()", "start()", "execute()", "begin()"],
+    "correctAnswer": "start()"
+  },
+  {
+    "question": "Which package is used for input/output in Java?",
+    "options": ["java.io", "java.util", "java.net", "java.lang"],
+    "correctAnswer": "java.io"
+  },
+  {
+    "question": "What operator is used for object comparison?",
+    "options": ["==", "equals()", "compare()", "isEqual()"],
+    "correctAnswer": "equals()"
+  },
+  {
+    "question": "What is the size of a float in Java?",
+    "options": ["32 bits", "64 bits", "8 bits", "16 bits"],
+    "correctAnswer": "32 bits"
+  },
+  {
+    "question": "Which of these is not a Java keyword?",
+    "options": ["class", "interface", "method", "package"],
+    "correctAnswer": "method"
+  },
+  {
+    "question": "Which method is used to find the length of an array in Java?",
+    "options": ["length()", "size()", "getLength()", "arraySize()"],
+    "correctAnswer": "length()"
+  },
+  {
+    "question": "Which access modifier allows visibility within the same package?",
+    "options": ["public", "protected", "default", "private"],
+    "correctAnswer": "default"
+  },
+  {
+    "question": "Which class is the superclass of all classes in Java?",
+    "options": ["Object", "Class", "Main", "System"],
+    "correctAnswer": "Object"
+  },
+  {
+    "question": "What is the extension of a compiled Java file?",
+    "options": [".java", ".class", ".javac", ".exe"],
+    "correctAnswer": ".class"
+  },
+  {
+    "question": "Which keyword is used to inherit a class in Java?",
+    "options": ["extend", "extends", "inherit", "implements"],
+    "correctAnswer": "extends"
+  },
+  {
+    "question": "What is a collection of methods with no implementation called?",
+    "options": ["Class", "Abstract Class", "Interface", "Object"],
+    "correctAnswer": "Interface"
+  },
+  {
+    "question": "Which exception is thrown when a file is not found?",
+    "options": ["IOException", "FileNotFoundException", "Exception", "RuntimeException"],
+    "correctAnswer": "FileNotFoundException"
+  },
+  {
+    "question": "Which of these is used to perform all input and output operations in Java?",
+    "options": ["Streams", "Variables", "Data Types", "Classes"],
+    "correctAnswer": "Streams"
+  },
+  {
+    "question": "Which of the following is not a type of loop in Java?",
+    "options": ["for", "while", "do-while", "foreach"],
+    "correctAnswer": "foreach"
+  },
+  {
+    "question": "What does the `final` keyword do when applied to a class?",
+    "options": ["Allows inheritance", "Prevents inheritance", "Allows method overriding", "Prevents method overriding"],
+    "correctAnswer": "Prevents inheritance"
+  },
+  {
+    "question": "What is the default value of a String variable in Java?",
+    "options": ["empty string", "null", "undefined", "0"],
+    "correctAnswer": "null"
+  }
+]

Quiz-app/src/QuizApp.java

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+import javax.swing.*;
+import java.awt.*;
+import java.nio.file.*;
+import java.sql.Array;
+import java.util.*;
+import com.google.gson.*;
+import java.util.List;
+
+class QuizApp extends JFrame {
+    private int i= 0;
+    private int j = 0;
+    private int count = 0;
+    private List<Questions> questionList;
+    private JLabel questionLabel;
+    private JLabel questionText;
+    private JRadioButton option1, option2, option3, option4;
+    public ButtonGroup optionsGroup;
+    private JButton nextButton;
+
+    QuizApp() {
+        loadJson();
+
+        Font questionFont = new Font("Futura", Font.BOLD, 32);
+        Font optionsFont = new Font("Calibri", Font.PLAIN, 28);
+
+        questionLabel = new JLabel("Question", JLabel.CENTER);
+        questionLabel.setFont(questionFont);
+        questionLabel.setForeground(new Color(255, 255, 240));
+
+        questionText = new JLabel("", JLabel.CENTER);
+        questionText.setFont(optionsFont);
+        questionText.setForeground(new Color(255, 255, 240));
+
+        option1 = new JRadioButton();
+        option2 = new JRadioButton();
+        option3 = new JRadioButton();
+        option4 = new JRadioButton();
+
+        option1.setFont(optionsFont);
+        option2.setFont(optionsFont);
+        option3.setFont(optionsFont);
+        option4.setFont(optionsFont);
+
+        option1.setBackground(new Color(100, 180, 250));
+        option2.setBackground(new Color(65, 105, 225));
+        option3.setBackground(new Color(100, 180, 250));
+        option4.setBackground(new Color(65, 105, 225));
+
+        option1.setForeground(Color.WHITE);
+        option2.setForeground(Color.WHITE);
+        option3.setForeground(Color.WHITE);
+        option4.setForeground(Color.WHITE);
+
+        optionsGroup = new ButtonGroup();
+        optionsGroup.add(option1);
+        optionsGroup.add(option2);
+        optionsGroup.add(option3);
+        optionsGroup.add(option4);
+
+        nextButton = new JButton("Next");
+        nextButton.setFont(optionsFont);
+        nextButton.setBackground(new Color(50, 205, 50));
+        nextButton.setForeground(Color.WHITE);
+        nextButton.setFocusPainted(false);
+        nextButton.setBorder(BorderFactory.createLineBorder(new Color(34, 139, 34)));
+
+
+
+        Container c = getContentPane();
+        c.setLayout(null);
+        c.setBackground(new Color(25, 40, 112));
+
+        questionLabel.setBounds(110, 30, 600, 50);
+        questionText.setBounds(110, 80, 600, 50);
+        option1.setBounds(150, 160, 500, 50);
+        option2.setBounds(150, 220, 500, 50);
+        option3.setBounds(150, 280, 500, 50);
+        option4.setBounds(150, 340, 500, 50);
+        nextButton.setBounds(250, 420, 300, 50);
+
+        c.add(questionLabel);
+        c.add(questionText);
+        c.add(option1);
+        c.add(option2);
+        c.add(option3);
+        c.add(option4);
+        c.add(nextButton);
+
+        nextButton.addActionListener(
+                a->
+                {
+                    checkAnswer();
+                    loadnextquestion();
+
+                }
+        );
+
+        loadnextquestion();
+
+        setVisible(true);
+        setSize(800, 600);
+        setLocationRelativeTo(null);
+        setDefaultCloseOperation(EXIT_ON_CLOSE);
+        setTitle("Quiz Application");
+
+
+    }
+
+    void loadJson()
+    {
+        String filename = "Quiz.json";
+        Path p = Paths.get(filename);
+        try {
+            if (Files.exists(p))
+            {
+                String result = new String(Files.readAllBytes(p));
+                Gson gson = new Gson();
+                Questions[] obj1 = gson.fromJson(result,Questions[].class);
+                questionList = new ArrayList<>(Arrays.asList(obj1));
+
+            } else
+            {
+                JOptionPane.showMessageDialog(null, "File doesn't exist");
+            }
+
+        }
+        catch(Exception e)
+        {
+            JOptionPane.showMessageDialog(null,e.getMessage());
+        }
+    }
+
+    void loadnextquestion()
+    {
+
+        if(i<questionList.size())
+        {
+
+
+            Questions obj = questionList.get(i);
+
+            questionLabel.setText("Question : "+(i+1));
+            questionText.setText(obj.question);
+            option1.setText(obj.options[0]);
+            option2.setText(obj.options[1]);
+            option3.setText(obj.options[2]);
+            option4.setText(obj.options[3]);
+
+        }
+        else
+        {
+            JOptionPane.showMessageDialog(null,"Your score is "+ count );
+            System.exit(0);
+        }
+        i++;
+    }
+
+    void checkAnswer()
+    {
+        if(j<questionList.size())
+        {
+            String correctAnswer;
+            Questions obj = questionList.get(j);
+
+            correctAnswer = obj.correctAnswer;
+            if (option1.isSelected() && option1.getText().equals(correctAnswer))
+            {
+                option1.setBackground(Color.green);
+                JOptionPane.showMessageDialog(null,"correct");
+                count++;
+                option1.setBackground(new Color(100, 180, 250));
+
+            }
+            else if (option2.isSelected() && option2.getText().equals(correctAnswer))
+            {
+                option2.setBackground(Color.green);
+                JOptionPane.showMessageDialog(null,"correct");
+                count++;
+                option2.setBackground(new Color(65, 105, 225));
+
+            }
+            else if (option3.isSelected() && option3.getText().equals(correctAnswer))
+            {
+                option3.setBackground(Color.green);
+                JOptionPane.showMessageDialog(null,"correct");
+                count++;
+                option3.setBackground(new Color(100, 180, 250));
+
+            }
+            else if (option4.isSelected() && option4.getText().equals(correctAnswer))
+            {
+                option4.setBackground(Color.green);
+                JOptionPane.showMessageDialog(null,"correct");
+                count++;
+                option4.setBackground(new Color(65, 105, 225));
+            }
+            else
+            {
+                JOptionPane.showMessageDialog(null,"Incorrect");
+
+            }
+
+            j++;
+        }
+    }
+
+    public static void main(String[] args) {
+        new QuizApp();
+    }
+}
+
+class Questions {
+    String question;
+    String[] options;
+    String correctAnswer;
+}
+