Currency Converter.java

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10 Best Java Projects for Beginners 2022 [With Source Code]




Posted in Java
Java Projects

Simran Kaur Arora
Last Updated 27 Jun, 2022
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Table of Contents

Java is one of the most commonly used programming languages in the world, and it is particularly prevalent in mobile applications. However, it is also commonly found in everything from desktop applications, web servers and application servers, games, and database connections.





Java has a long history and several advantages. If you’re looking to become a Java developer, you’ll need to actually start coding, like every other programming language. Here, we list the 10 best Java projects for beginners in 2022.

What is Java?
Developed and created by John Gosling in1995 in Sun Microsystems, Java is a general-purpose, object-oriented programming language. It was developed and intended to follow the WORA concept which means Write Once Run Anywhere i.e. compiled Java code can run on all platforms that support Java without the need for recompilation. 

It is popular among developers because of its following characteristics:

Object-Oriented
Portable
Platform independent
Secured
Robust
Architecture neutral
Interpreted
High Performance
Multithreaded
Distributed
Dynamic

Java IDEs to Start Building Projects
There are plenty of Java IDEs and online editors for you to begin developing Java projects. The following list covers some of the most popular editors and IDEs.



IDEs:

MyEclipse
IntelliJ IDEA
NetBeans
Dr. Java
Blue J
JDeveloper
Online Editors:

Codiva
JDoodle
Rextester
Online GDB
Browxy
IDE One
For detailed information about IDEs and editors, you may want to read Java IDEs.

Best Java Projects for Beginners
The following are simple Java projects for beginners and should do a good job of covering all the essential fundamental concepts of Java. 



In some instances, the code is too long to include the source code in text, so we’ve provided links instead.

1. Smart City Project
This Smart City project tells individuals visiting the city about hotels, transportation facilities, air ticket booking, shopping details, city news, etc. It is a web-based software developed in Java Programming language that solves most of the problems that any new visitor faces when coming to a new city like pathfinding, hotel searching, and ticket booking, among other things.


2. Currency Converter
This currency converter is a mini-Java project that provides a web-based interface for exchanging/converting money from one currency to another. It is developed using Ajax, Java servlets web features. Such applications have been used in the business industry.



/*

* To change this template, choose Tools | Templates

* and open the template in the editor.

*/

package com.exchange;

import java.io.*;

import java.net.*;

import java.util.*;

import javax.servlet.*;

import javax.servlet.http.*;

import java.io.InputStream;

import java.net.*;

import com.google.gson.*;

/**

*

* @author pakallis

*/

classRecv

{

private String lhs;

private String rhs;

private String error;

private String icc;

public Recv(

{

}

public String getLhs()

{

return lhs;

}

public String getRhs()

{

return rhs;

}

}

public classConvertextendsHttpServlet {

/**

* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.

* @param request servlet request

* @param response servlet response

* @throws ServletException if a servlet-specific error occurs

* @throws IOException if an I/O error occurs

*/

protected void processRequest(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

String query = "";

String amount = "";

String curTo = "";

String curFrom = "";

String submit = "";

String res = "";

HttpSession session;

resp.setContentType("text/html;charset=UTF-8");

PrintWriter out = resp.getWriter();

/*Read request parameters*/

amount = req.getParameter("amount");

curTo = req.getParameter("to");

curFrom = req.getParameter("from");

/*Open a connection to google and read the result*/

try {

query = "http://www.google.com/ig/calculator?hl=en&q=" + amount + curFrom + "=?" + curTo;

URL url = new URL(query);

InputStreamReader stream = new InputStreamReader(url.openStream());

BufferedReader in = new BufferedReader(stream);

String str = "";

String temp = "";

while ((temp = in.readLine()) != null) {

str = str + temp;

}

/*Parse the result which is in json format*/

Gson gson = new Gson();

Recv st = gson.fromJson(str, Recv.class);

String rhs = st.getRhs();

rhs = rhs.replaceAll("�", "");

/*we do the check in order to print the additional word(millions,billions etc)*/

StringTokenizer strto = new StringTokenizer(rhs);

String nextToken;

out.write(strto.nextToken());

nextToken = strto.nextToken();

if( nextToken.equals("million") || nextToken.equals("billion") || nextToken.equals("trillion"))

{

out.println(" "+nextToken);

}

} catch (NumberFormatException e) {

out.println("The given amount is not a valid number");

}

}

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">

/**

* Handles the HTTP <code>GET</code> method.

* @param request servlet request

* @param response servlet response

* @throws ServletException if a servlet-specific error occurs

* @throws IOException if an I/O error occurs

*/

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

processRequest(request, response);

}

/**

* Handles the HTTP <code>POST</code> method.

* @param request servlet request

* @param response servlet response

* @throws ServletException if a servlet-specific error occurs

* @throws IOException if an I/O error occurs

*/

@Override

protected void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

processRequest(request, response);

}

/**

* Returns a short description of the servlet.

* @return a String containing servlet description

*/

@Override

public String getServletInfo() {

return "Short description";

}// </editor-fold>

}