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OnlineTest.java
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OnlineTest.java
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package com.gainjava.knowledge;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JRadioButton;
class OnlineTest extends JFrame implements ActionListener {
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, "Total Correct Answer = " + count);
System.exit(0);
}
}
// SET Questions with options
void set() {
radioButton[4].setSelected(true);
if (current == 0) {
label.setText("Q1: Which of the following doesn't have a superclass?");
radioButton[0].setText("System");
radioButton[1].setText("Object");
radioButton[2].setText("Lang");
radioButton[3].setText("Exception");
}
if (current == 1) {
label.setText("Q2: Which provides runtime environment for java byte code to excute?");
radioButton[0].setText("JDK");
radioButton[1].setText("JVM");
radioButton[2].setText("JRE");
radioButton[3].setText("JAVAC");
}
if (current == 2) {
label.setText("Q3: Which of the following is not a Java features.");
radioButton[0].setText("Dynamic");
radioButton[1].setText("Architecture Neutral");
radioButton[2].setText("Use of pointers");
radioButton[3].setText("Object-oriented");
}
if (current == 3) {
label.setText("Q4: What is the return type of the hashCode() method in the Object class?");
radioButton[0].setText("Object");
radioButton[1].setText("int");
radioButton[2].setText("long");
radioButton[3].setText("void");
}
if (current == 4) {
label.setText("Q5: In which process, a local variable has the same name as one of the instance variables?");
radioButton[0].setText("Serialization");
radioButton[1].setText("Variable Shadowing");
radioButton[2].setText("Abstraction");
radioButton[3].setText("Multi-threading");
}
if (current == 5) {
label.setText("Q6: Which package contains the Random class?");
radioButton[0].setText("java.util package");
radioButton[1].setText("java.lang package");
radioButton[2].setText("java.awt package");
radioButton[3].setText("java.io package");
}
if (current == 6) {
label.setText("Q7: In java, jar stands for_____?");
radioButton[0].setText("Java Archive Runner");
radioButton[1].setText("Java Application Resource");
radioButton[2].setText("Java Application Runner");
radioButton[3].setText("None of the above");
}
if (current == 7) {
label.setText("Q8: Which one is a template for creating different objects?");
radioButton[0].setText("An Array");
radioButton[1].setText("A class");
radioButton[2].setText("Interface");
radioButton[3].setText("Method");
}
if (current == 8) {
label.setText("Q9: Which of the following are not Java keywords.");
radioButton[0].setText("double");
radioButton[1].setText("switch");
radioButton[2].setText("then");
radioButton[3].setText("instanceof");
}
if (current == 9) {
label.setText("Q10: Which of these is returned by operator '&'?");
radioButton[0].setText("Integer");
radioButton[1].setText("Character");
radioButton[2].setText("Boolean");
radioButton[3].setText("Float");
}
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[2].isSelected());
if (current == 3)
return (radioButton[1].isSelected());
if (current == 4)
return (radioButton[1].isSelected());
if (current == 5)
return (radioButton[0].isSelected());
if (current == 6)
return (radioButton[3].isSelected());
if (current == 7)
return (radioButton[1].isSelected());
if (current == 8)
return (radioButton[2].isSelected());
if (current == 9)
return (radioButton[1].isSelected());
return false;
}
public static void main(String s[]) {new OnlineTest("Online Quiz");
}
}