Hello guys, the Internet is full of useful resources, and no matter what you want to learn, there is something useful available for free. You just need to commit your time and effort. But at the same time, it's challenging to choose from the massive sea of free tutorials and courses on the internet. If you are not careful, you will spend most of your time browsing and changing classes without learning anything. That's where a curated list helps. Curation is my hobby and passion. I love to read books and courses which allows me to curate useful resources and share them with you guys.
3 ways to Learn Java Programming in 2025? Books, Courses, and Projects
Hello guys, if you want to learn Java and wondering what is the best way to learn Java in 2025 then you have come to the right place. In the past, I have shared many useful resources to learn Java programming and development like the 2025 Java Developer RoadMap, best Java courses, best Java books, and this list of best websites to learn Java for FREE, and in this article, I will tell you the best way to learn Java in 2025. Learning Java programming is quite rewarding and I can say that it was my best decision to learn Java 20 years ago. It opens doors to many opportunities in software development and lucrative jobs like Java developers on Investment banks like JP Morgan, UBS, Citibank, Barclays, and more.
Top 6 Docker Courses for Java and Microservices Developers in 2025 - Best of Lot
Hello Java programmer, if you want to learn Docker and looking for the best Docker Courses from Java and Spring Boot developer point of view, then you have come to the right place. Earlier, I shared free Spring Boot courses and Docker courses, and in this article, I will share the best Docker courses for Java and Spring developers. Java is one of the most popular and widely used programming languages. It is an evergreen programming language. For Java developers, Docker is a game-changer. Docker is emerging rapidly, and it's now one of the most essential tools for all kinds of programmers, and there are reasons for it like Docker makes both development and deployment easier.
Top 35 Java String Interview Questions with Answers for 2 to 5 Years Experienced Programmers
Hello Java Programmers, if you are preparing for a Java developer interview and want to refresh your knowledge about String class in Java then you have come to the right place. In the past, I have shared 130+ Core Java Interview Questions and 21 String Coding Problems for Interviews and in this article, I am going to share 35 Java String Questions for Interviews. The String class and concept is a very important class in Java. There is not a single Java program out there which is not use String objects and that's why it's very important from the interview point of view as well. In this article, I am going to share 35 String-based questions from different Java interviews.
Top 53 Java Programs for Coding and Programming Interviews
Hello guys, if you are learning to code and programming, or preparing for a programming job interview and looking for some practice material then you have come to the right place. Earlier, I have shared the best string, array, linked list, and binary tree coding problems and In this article, I am going to share some of the most common Java coding and programming problems for beginners. These are the problems, I have solved myself to learn to program and develop a coding sense and these are the ones that keep coming on Java coding interviews. By going through these coding problems you will not only learn Java but also prepare yourself for Java interviews.
10 Examples of Stream API in Java 8 - count + filter + map + distinct + collect() Examples
The Java 8 release of Java Programming language was a game-changer version. It not only provided some useful methods but totally changed the way you write programs in Java. The most significant change it brings in the mindset of Java developers was to think functional and supported that by providing critical features like lambda expression and Stream API, which takes advantage of parallel processing and functional operations like filter, map, flatMap, etc. Since then, a lot of Java developers are trying their hands to learn those significant changes like lambda expression, method reference, new Date and Time classes, and, more importantly, Stream API for bulk data operations.
How to debug Java 8 Stream Pipeline - peek() method Example Tutorial
Hello guys, I have been writing about some important methods from Java SE 8 like map(), flatMap(), collect(), etc for quite some time, and today I'll share my experience with another useful method peek() from java.utill.stream.Stream class. The peek() method of the Stream class can be very useful to debug and understand streams in Java 8. You can use the peek() method to see the elements as they flow from one step to another like when you use the filter() method for filtering, you can actually see how filtering is working like lazy evaluation as well as which elements are filtered.
How to convert ArrayList to HashMap and LinkedHashMap in Java 8 - Example Tutorial
One of the common tasks in Java is to convert a List of objects, like a List<T> into a Map, I mean Map<K, V>, where K is some property of the object and V is the actual object. For example, suppose you have a List<Order>, and you want to convert it into a Map, e.g. Map<OrderId, Order>, how do you that? Well, the simplest way to achieve this is iterating over List and add each element to the Map by extracting keys and using the actual element as an object. This is exactly what many of us do in the pre-Java 8 world, but JDK 8 has made it even simpler.
Java 8 Stream map() function Example with Explanation
The map is a well-known functional programming concept that is incorporated into Java 8. Map is a function defined in java.util.stream.Streams class, which is used to transform each element of the stream by applying a function to each element. Because of this property, you can use a map() in Java 8 to transform a Collection, List, Set, or Map. For example, if you have a list of String and you want to convert all of them into upper case, how will you do this? Prior to Java 8, there is no function to do this.
How to Convert a Comma Separated String to an ArrayList in Java - Example Tutorial
Suppose you have a comma-separated list of String e.g. "Samsung, Apple, Sony, Google, Microsoft, Amazon" and you want to convert it into an ArrayList containing all String elements e.g. Samsung, Apple, Google, etc. How do you do that? Well, Java doesn't provide any such constructor or factory method to create ArrayList from delimited String, but you can use String.split() method and Arrays.asList() method together to create an ArrayList from any delimited String, not just comma separated one.
How to Show Open Save File Dialog in Java Swing Application? JFileChooser Example
Hello guys, if you worked in Java GUI-based application then you may know that Swing provides class javax.swing.JFileChooser can be used to present a dialog for the user to choose a location and type a file name to be saved, using the showSaveDialog() method. Syntax of this method is as follows:
public int showSaveDialog(Component parent)
where the parent is the parent component of the dialog, such as a JFrame.
float and double data types in Java with Examples
Hello guys, float and double are two of the important data types in Java, but many developers don't pay enough attention to these two data types, resulting in writing poor code with subtle bugs. To be honest, they are not easy to use because of the complexity with floating-point calculation but knowing even simple things like the maximum and minimum limit of float and double data types and how to compare float and double variables can go a long way in eliminating bugs which are not obvious.
Java - Convert String to Short Example
In the last couple of examples, I have taught you how to convert String to Integer, Long, Double, Float, Boolean, and Byte in Java, and today I will show you how to convert String to Short in Java, but before that let's revise what is a short data type in Java. The short is an integral data type similar to the int but it only takes 2 bytes to store data as compared to 4 bytes required by an int variable. Since it takes only 2 bytes or 16 bits to store data, the range of short is also shorter than int. It ranges from -32,768 to 32767 (inclusive) or -2^15 to 2^15 -1. You might be wondering why the upper bound is 255 and the lower bound is -256 but that's because we have included zero in between.
How to Fix Access restriction: The type BASE64Decoder is not accessible due to restriction Error in Eclipse? [Solution]
Hello guys, if you have been using Eclipse for Java development then you might have seen this dreaded "Access restriction: The type BASE64Decoder is not accessible due to restriction Error" before. This error comes when you are trying to encode String into Base64 using BASE64Decoder in Eclipse because the class BASE64Decoder is not part of JDK's public API, it comes from sun.misc package which is non-public. Though this class is present in JDK and JRE and allows you to encode and decode String into base 64, any access to this class from Eclipse flags as an error in Eclipse IDE. If you compile and run the same program from the command line or NetBeans you will not get this error.
How to Fix javax.net.ssl.SSLHandshakeException: unable to find valid certification path to requested target in Java
Hello guys, this is one of the common errors in a client-server application. The big problem in solving this error is not the error but the knowledge of how client-server SSL handshake works. I have blogged about that before and if you have read that you know that in order to connect to any website or server (like LDAP Server) using SSL, you need to have certificates (public keys) to validate the certificates sends by the website you are connecting. If you don't have the root certificate or public key, which is required to validate the certificate presented by the server in your JRE truststore then Java will throw this error.
5 Difference between BufferedReader and Scanner class in Java? Example
Hello guys, welcome to my blog. Today, we'll discuss another interesting Java interview question, BufferedReader vs Scanner. It's not only important from an interview point of view but also to work efficiently with Java. Even though both BufferedReader and Scanner can read a file or user input from the command prompt in Java, there are some significant differences between them. One of the main differences between BufferedReader and Scanner class is that the former class is meant to just read String or text data while the Scanner class is meant to both read and parse text data into Java primitive types like int, short, float, double, and long.
11 Examples of LocalDate, LocalTime, and LocalDateTime in Java 8
Hello guys, if you are wondering how to use LocalDate, LocalTime, and LocalDateTime classes from Java's new Date and Time API then you have come to the right place. Earlier, I have shared best Java 8 courses, books, and Java 8 interview questions and in this article, I Am going to share common examples of LocalDateTime, LocalDate, and LocalTime class in Java. It's been many years since Java SE 8 was released and Java 8 adoption has come a long way. Java programmers around the world have accepted with both ends, many companies have switched their development on Java 8 and several others are migrating to Java 8 platform.
3 Examples to Convert Date to LocalDate in Java 8? Tutorial
One of the great features of Java 8 is the new Date and Time API which is intended to fix existing issues related to mutability and thread-safety with existing java.util.Date class. But given java.util.Date is used very heavily across all the Java applications, you will often end up with a situation where you need to convert java.uti.Date to java.time.LocalDate while working in Java 8. Unfortunately there is no toLocalDate() method in the java.util.Date class. Though, you can easily convert Date to LocalDate if you are familiar with how new and old API classes map to each other.
How to convert String to Date in Java? Example Tutorial
Hello guys, if you are wondering how to convert a String to Date object in Java then you have come to the right place. Data type conversion is one of the most common tasks in programming and every Java programmer must know how to convert one type to another type. There are many times when you will be required to convert a String to LocalDate or java.util.Date object mostly in a different format like dd-MM-yy or yyyy-MM-dd or simply yyyy MM dd. For example, clients pass dates as String to the Server or sometimes we read Date related data from CSV file. Java provides API for parsing String to date using DateFormat class, though Java's Date and Time API is severely criticized, it is also the most used Date and Time format solution.
How to convert Date to LocalDateTime in Java 8 - Example Tutorial
The LocalDateTime class has been introduced in Java 8 to represent both date and time values. It's local, so date and time are always in your local time zone. Since the java.util.Date has been widely used everywhere in many Java applications, you will often find yourself converting java.util.Date to LocalDate, LocalTime, and LocalDateTime classes of the java.time package. Earlier I have shown you how to convert Date to LocalDate and today, I am going to teach you how to convert Date to LocalDateTime in Java 8. The approach is the same. Since the equivalent class of java.util.Date in new Date and Time API in java.time.Instant, we first convert Date to Instance and then create LocalDateTime instance from that Instant using System's default timezone.
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