Top Java Projects you need to know in 2021
The demand for Java is never-ending and many top MNCs are looking for Java Developers. These days, having hands-on experience in java and trying out projects in java would be an added weight to your resume. In this article, we shall try out the top 5 projects that you need to know in 2021.
Online Examination
This particular project is designed to provide a user interface that asks multiple-choice questions and takes inputs from users as the answers and then, finally evaluates all the questions and gives back the output as the individuals result.
package Edureka;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class OnlineTest extends JFrame implements ActionListener {
JLabel l;
JRadioButton jb[] = new JRadioButton[5];
JButton b1, b2;
ButtonGroup bg;
int count = 0, current = 0, x = 1, y = 1, now = 0;
int m[] = new int[10];
OnlineTest(String s) {
super(s);
l = new JLabel();
add(l);
bg = new ButtonGroup();
for (int i = 0; i < 5; i++) {
jb[i] = new JRadioButton();
add(jb[i]);
bg.add(jb[i]);
}
b1 = new JButton("Next");
b2 = new JButton("Bookmark");
b1.addActionListener(this);
b2.addActionListener(this);
add(b1);
add(b2);
set();
l.setBounds(30, 40, 450, 20);
jb[0].setBounds(50, 80, 100, 20);
jb[1].setBounds(50, 110, 100, 20);
jb[2].setBounds(50, 140, 100, 20);
jb[3].setBounds(50, 170, 100, 20);
b1.setBounds(100, 240, 100, 30);
b2.setBounds(270, 240, 100, 30);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(null);
setLocation(250, 100);
setVisible(true);
setSize(600, 350);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == b1) {
if (check())
count = count + 1;
current++;
set();
if (current == 9) {
b1.setEnabled(false);
b2.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)
b2.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 ans=" + count);
System.exit(0);
}
}
void set() {
jb[4].setSelected(true);
if (current == 0) {
l.setText("Que1: Which one among these is not a primitive datatype?");
jb[0].setText("int");
jb[1].setText("Float");
jb[2].setText("boolean");
jb[3].setText("char");
}
if (current == 1) {
l.setText("Que2: Which class is available to all the class automatically?");
jb[0].setText("Swing");
jb[1].setText("Applet");
jb[2].setText("Object");
jb[3].setText("ActionEvent");
}
if (current == 2) {
l.setText("Que3: Which package is directly available to our class without importing it?");
jb[0].setText("swing");
jb[1].setText("applet");
jb[2].setText("net");
jb[3].setText("lang");
}
if (current == 3) {
l.setText("Que4: String class is defined in which package?");
jb[0].setText("lang");
jb[1].setText("Swing");
jb[2].setText("Applet");
jb[3].setText("awt");
}
if (current == 4) {
l.setText("Que5: Which institute is best for java coaching?");
jb[0].setText("Utek");
jb[1].setText("Aptech");
jb[2].setText("SSS IT");
jb[3].setText("jtek");
}
if (current == 5) {
l.setText("Que6: Which one among these is not a keyword?");
jb[0].setText("class");
jb[1].setText("int");
jb[2].setText("get");
jb[3].setText("if");
}
if (current == 6) {
l.setText("Que7: Which one among these is not a class? ");
jb[0].setText("Swing");
jb[1].setText("Actionperformed");
jb[2].setText("ActionEvent");
jb[3].setText("Button");
}
if (current == 7) {
l.setText("Que8: which one among these is not a function of Object class?");
jb[0].setText("toString");
jb[1].setText("finalize");
jb[2].setText("equals");
jb[3].setText("getDocumentBase");
}
if (current == 8) {
l.setText("Que9: which function is not present in Applet class?");
jb[0].setText("init");
jb[1].setText("main");
jb[2].setText("start");
jb[3].setText("destroy");
}
if (current == 9) {
l.setText("Que10: Which one among these is not a valid component?");
jb[0].setText("JButton");
jb[1].setText("JList");
jb[2].setText("JButtonGroup");
jb[3].setText("JTextArea");
}
l.setBounds(30, 40, 450, 20);
for (int i = 0, j = 0; i <= 90; i += 30, j++)
jb[j].setBounds(50, 80 + i, 200, 20);
}
boolean check() {
if (current == 0)
return (jb[1].isSelected());
if (current == 1)
return (jb[2].isSelected());
if (current == 2)
return (jb[3].isSelected());
if (current == 3)
return (jb[0].isSelected());
if (current == 4)
return (jb[2].isSelected());
if (current == 5)
return (jb[2].isSelected());
if (current == 6)
return (jb[1].isSelected());
if (current == 7)
return (jb[3].isSelected());
if (current == 8)
return (jb[1].isSelected());
if (current == 9)
return (jb[2].isSelected());
return false;
}
public static void main(String s[]) {
new OnlineTest("Online Test Of Java");
}
}Output
//Final Output after answering all questions
The next project is the Group Conversation.
Group Conversation
This project is designed to provide a group conversation amongst multiple terminals. the code for the same is as follows. the users must take care of the port numbers and IP addresses. The code for the same is as follows.
package groupchat;
import java.net.*;
import java.io.*;
import java.util.*;
public class GroupConversation {
private static final String TERMINATE = "Exit";
static String name;
static volatile boolean finished = false;
public static void main(String[] args) {
if (args.length != 2)
System.out.println("Two arguments required: <multicast-host> <port-number>");
else {
try {
InetAddress group = InetAddress.getByName(args[0]);
int port = Integer.parseInt(args[1]);
Scanner sc = new Scanner(System.in);
System.out.print("Enter your name: ");
name = sc.nextLine();
MulticastSocket socket = new MulticastSocket(port);
socket.setTimeToLive(0);
socket.joinGroup(group);
Thread t = new Thread(new ReadThread(socket, group, port));
t.start();
System.out.println("Start typing messages...n");
while (true) {
String message;
message = sc.nextLine();
if (message.equalsIgnoreCase(GroupConversation.TERMINATE)) {
finished = true;
socket.leaveGroup(group);
socket.close();
break;
}
message = name + ": " + message;
byte[] buffer = message.getBytes();
DatagramPacket datagram = new DatagramPacket(buffer, buffer.length, group, port);
socket.send(datagram);
}
}
catch (SocketException se) {
System.out.println("Error creating socket");
se.printStackTrace();
}
catch (IOException ie) {
System.out.println("Error reading/writing from/to socket");
ie.printStackTrace();
}
}
}
}
class ReadThread implements Runnable {
private MulticastSocket socket;
private InetAddress group;
private int port;
private static final int MAX_LEN = 1000;
ReadThread(MulticastSocket socket, InetAddress group, int port) {
this.socket = socket;
this.group = group;
this.port = port;
}
@Override
public void run() {
while (!GroupConversation.finished) {
byte[] buffer = new byte[ReadThread.MAX_LEN];
DatagramPacket datagram = new DatagramPacket(buffer, buffer.length, group, port);
String message;
try {
socket.receive(datagram);
message = new String(buffer, 0, datagram.getLength(), "UTF-8");
if (!message.startsWith(GroupConversation.name))
System.out.println(message);
}
catch (IOException e) {
System.out.println("Socket closed!");
}
}
}
}//Output
The next project is the OTP Generator
OTP Generator
This project is designed to generate OTP in the realtime using the random function. the code for the same is as follows.
package otp;
import java.util.*;
public class Edureka {
static char[] OTP(int len) {
System.out.println("Generating OTP using random() : ");
System.out.print("Your OTP is : ");
String numbers = "0123456789";
Random rndm_method = new Random();
char[] otp = new char[len];
for (int i = 0; i < len; i++) {
otp[i] = numbers.charAt(rndm_method.nextInt(numbers.length()));
}
return otp;
}
public static void main(String[] args) {
int length = 4;
System.out.println(OTP(length));
}
}//Output
Generating OTP using random() :
Your OTP is : 7892
The next project is the Password Generator
Password Generator
This project is designed to generate Password in the realtime using the random function. the code for the same is as follows.
package OTP_Generator;
import java.util.*;
public class Edureka {
public static void main(String[] args) {
int length = 10;
System.out.println(geek_Password(length));
}
static char[] geek_Password(int len) {
System.out.println("Generating password using random() : ");
System.out.print("Your new password is : ");
String Capital_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
String Small_chars = "abcdefghijklmnopqrstuvwxyz";
String numbers = "0123456789";
String symbols = "!@#$%^&*_=+-/.?<>)";
String values = Capital_chars + Small_chars + numbers + symbols;
Random rndm_method = new Random();
char[] password = new char[len];
for (int i = 0; i < len; i++) {
password[i] = values.charAt(rndm_method.nextInt(values.length()));
}
return password;
}
}//Output
Generating password using random() :
Your new password is : /vZr_QsZNm
With this, we come to an end of this Java Projects Tutorial. I hope you have understood these Java Projects and their implementation.
If you wish to check out more articles on the market’s most trending technologies like Artificial Intelligence, DevOps, Ethical Hacking, then you can refer to Edureka’s official site.
Do look out for other articles in this series which will explain the various other aspects of Java.
1. Object Oriented Programming
5. Java String
6. Java Array
8. Java Threads
9. Introduction to Java Servlets
11. Exception Handling in Java
14. Java Programs
15. Kotlin vs Java
16. Dependency Injection Using Spring Boot
22. Socket Programming In Java
25. Library Management System Project in Java
26. Trees in Java
28. Top Data Structures & Algorithms in Java
30. Top 55 Servlet Interview Questions
31. Java Tutorial
34. Java Collections Interview Questions and Answers
35. How to Handle Deadlock in Java?
36. Top 50 Java Collections Interview Questions You Need to Know
37. What is the concept of String Pool in Java?
38. What is the difference between C, C++, and Java?
39. Palindrome in Java- How to check a number or string?
40. Top MVC Interview Questions and Answers You Need to Know
41. Top 10 Applications of Java Programming Language
42. Deadlock in Java
43. Square and Square Root in Java
Originally published at https://www.edureka.co on September 30, 2019.
