private static final long serialVersionUID = 1L;

JLabel label;
JRadioButton radioButton[] = new JRadioButton[5];
JButton btnNext, btnBookmark;
ButtonGroup bg;
int count = 0, current = 0, x = 1, y = 1, now = 0;
int m[] = new int[10];

// create jFrame with radioButton and JButton
OnlineTest(String s) {
	super(s);
	label = new JLabel();
	add(label);
	bg = new ButtonGroup();
	for (int i = 0; i < 5; i++) {
		radioButton[i] = new JRadioButton();
		add(radioButton[i]);
		bg.add(radioButton[i]);
	}
	btnNext = new JButton("Next");
	btnBookmark = new JButton("Bookmark");
	btnNext.addActionListener(this);
	btnBookmark.addActionListener(this);
	add(btnNext);
	add(btnBookmark);
	set();
	label.setBounds(30, 40, 450, 20);
	//radioButton[0].setBounds(50, 80, 200, 20);
	radioButton[0].setBounds(50, 80, 450, 20);
	radioButton[1].setBounds(50, 110, 200, 20);
	radioButton[2].setBounds(50, 140, 200, 20);
	radioButton[3].setBounds(50, 170, 200, 20);
	btnNext.setBounds(100, 240, 100, 30);
	btnBookmark.setBounds(270, 240, 100, 30);
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	setLayout(null);
	setLocation(250, 100);
	setVisible(true);
	setSize(600, 350);
}

// handle all actions based on event
public void actionPerformed(ActionEvent e) {
	if (e.getSource() == btnNext) {
		if (check())
			count = count + 1;
		current++;
		set();
		if (current == 9) {
			btnNext.setEnabled(false);
			btnBookmark.setText("Result");
		}
	}
	if (e.getActionCommand().equals("Bookmark")) {
		JButton bk = new JButton("Bookmark" + x);
		bk.setBounds(480, 20 + 30 * x, 100, 30);
		add(bk);
		bk.addActionListener(this);
		m[x] = current;
		x++;
		current++;
		set();
		if (current == 9)
			btnBookmark.setText("Result");
		setVisible(false);
		setVisible(true);
	}
	for (int i = 0, y = 1; i < x; i++, y++) {
		if (e.getActionCommand().equals("Bookmark" + y)) {
			if (check())
				count = count + 1;
			now = current;
			current = m[y];
			set();
			((JButton) e.getSource()).setEnabled(false);
			current = now;
		}
	}

	if (e.getActionCommand().equals("Result")) {
		if (check())
			count = count + 1;
		current++;
		JOptionPane.showMessageDialog(this, "correct answers= " + count);
		System.exit(0);
	}
}

// SET Questions with options
void set() {
	radioButton[4].setSelected(true);
	if (current == 0) {
		label.setText("Que1:  Which of the following is not introduced with Java 8?");
		radioButton[0].setText("Stream API");
		radioButton[1].setText("Serialization");
		radioButton[2].setText("Spliterator");
		radioButton[3].setText("Lambda Expression");
	}
	if (current == 1) {
		label.setText("Que2:  Which feature of java 7 allows to not explicitly close IO resource?");
		radioButton[0].setText("try catch finally");
		radioButton[1].setText("IOException");
		radioButton[2].setText("AutoCloseable");
		radioButton[3].setText("Streams");
	}
	if (current == 2) {
		label.setText("Que3: SessionFactory is a thread-safe object.");
		radioButton[0].setText("true");
		radioButton[1].setText("false");
		radioButton[2].setText("don't know");
		radioButton[3].setText("false");
	}
	if (current == 3) {
		label.setText("Que4: Which is the new method introduced in java 8 to iterate over a collection?");
		radioButton[0].setText("for (String i : StringList)");
		radioButton[1].setText("foreach (String i : StringList)");
		radioButton[2].setText("StringList.forEach()");
		radioButton[3].setText("List.for()");
	}
	if (current == 4) {
		label.setText("Que5:  What is the substitute of Rhino javascript engine in Java 8?");
		radioButton[0].setText(" Nashorn");
		radioButton[1].setText("V8");
		radioButton[2].setText("Inscript");
		radioButton[3].setText("Narcissus");
	}
	if (current == 5) {
		label.setText("Que6: How to read entire file in one line using java 8?");
		radioButton[0].setText("Files.readAllLines()");
		radioButton[1].setText("Files.read()");
		radioButton[2].setText("Files.readFile()");
		radioButton[3].setText("Files.lines()");
	}
	if (current == 6) {
		label.setText("Que7:  Which feature of java 7 allows to not explicitly close IO resource?");
		radioButton[0].setText("try catch finally");
		radioButton[1].setText("IOException");
		radioButton[2].setText("AutoCloseable");
		radioButton[3].setText("Streams");
	}
	if (current == 7) {
		label.setText("Que8:  Which of the following is not a core interface of Hibernate?");
		radioButton[0].setText("Configuration");
		radioButton[1].setText("Criteria");
		radioButton[2].setText("SessionManagement");
		radioButton[3].setText("Session");
	}
	if (current == 8) {
		label.setText("Que9: SessionFactory is a thread-safe object.");
		radioButton[0].setText("true");
		radioButton[1].setText("false");
		radioButton[2].setText("don't know");
		radioButton[3].setText("false");
	}
	if (current == 9) {
		label.setText("Que10: Which of the following is not a state of object in Hibernate?");
		radioButton[0].setText("Attached()");
		radioButton[1].setText("Detached()");
		radioButton[2].setText("Persistent()");
		radioButton[3].setText("Transient()");
	}
	label.setBounds(30, 40, 450, 20);
	for (int i = 0, j = 0; i <= 90; i += 30, j++)
		radioButton[j].setBounds(50, 80 + i, 200, 20);
}

// declare right answers.
boolean check() {
	if (current == 0)
		return (radioButton[1].isSelected());
	if (current == 1)
		return (radioButton[1].isSelected());
	if (current == 2)
		return (radioButton[0].isSelected());
	if (current == 3)
		return (radioButton[2].isSelected());
	if (current == 4)
		return (radioButton[0].isSelected());
	if (current == 5)
		return (radioButton[0].isSelected());
	if (current == 6)
		return (radioButton[1].isSelected());
	if (current == 7)
		return (radioButton[2].isSelected());
	if (current == 8)
		return (radioButton[0].isSelected());
	if (current == 9)
		return (radioButton[0].isSelected());
	return false;
}

public static void main(String s[]) {
	new OnlineTest("Online Test App");
}