How to count a number of words in given String in Java? [Solved]

Can you write a method in Java that accepts a String argument and returns a number of words in it? A word is a sequence of one or more non-space characters i.e. any character other than '' (empty String). This should be your method signature:

public int count(String word);

This method should return 1 if the input is "Java" and return 3 if the input is "Java, C++, Python". Similarly a call to wordCount("    ") should return 0. 

5 Best Udemy Courses to Learn Spring Framework in 2025

For all the Java developers landing on this blog, you are on the right page! For all who wanna transform, you too are also on the right page. Today we are gonna review a few of the best courses available in the market for the learning world's one of the most famous frameworks ever made, the Spring framework! The Spring Framework is a Java platform application framework and inversion of the control container. Any Java program may utilize the framework's fundamental capabilities, however, there are extensions for creating web apps on top of the Java EE platform.

5 Best Udemy Courses to Learn Hibernate in 2025

Hello there, if you're seeking the greatest Hibernate and JPA online courses in 2021, you've come to the correct spot. Hibernate ORM is a Java programming language object-relational mapping tool. It provides a framework for translating a relational database to an object-oriented domain model. It's an object-relational mapping (ORM) tool or platform that lets you deal just with objects while Hibernate takes care of your data. You may utilize the Hibernate framework in your project instead of developing classes using SQL to load, store, and update data using the DAO design pattern.


So, let's take a look at some f the best courses available in the market to learn Hibernate.

5 Best Hibernate courses on Udemy in 2025

Here are the best Udemy courses you can join to Learn Hibernate in depth. I highly recommend them to Java developers who want to upskill themselves in 2024 to 2205. 

1. Java Persistence: Hibernate and JPA Fundamentals[UDEMY]

rating: 4.5 out of 5

duration: 10 hours

instructor: Deshraj Singh Kiran

price: $42

This is the course for you if you're a Java programmer who wants to master Hibernate and JPA principles as well as some advanced subjects in Java Persistence with Hibernate.

Hibernate 4.3.5. Final (and applicable updates for Hibernate 5.0) will be covered in this course, as well as how to utilize Hibernate as a JPA provider.

You'll also study the principles of object/relational mapping, querying, cache performance, and concurrency, as well as some advanced JPA capabilities.

The principles of Object/Relational Mapping, Querying, Caching, Performance, and Concurrency, as well as certain advanced JPA capabilities.

The basics of First and Second Level Caching, N+1 Selects Problem & Batch Fetching, Optimistic Locking & Versioning, and Optimistic Locking & Versioning Entity Relationships, Inheritance Mapping, and Polymorphic Queries: The Basics

2. High-Performance Java Persistence - Mach 1[Vlad Mihalcea]

rating: 4.5 out of 5

duration: 4 hours

instructor: Vlad Mihalcea

price: $99

When you already know Hibernate and JPA and want to push your understanding of Hibernate and JPA to the next level, I recommend checking out @Vlad Mihalcea's High-Performance Java Persistence with Hibernate.

Vlad is a Java Champion and one of the most active Hibernate ORM project committers, whose goal is to better understand the inner workings of databases and frameworks in order to improve corporate system performance.

The following are some of the topics covered in this course:

Best practices for logging, testing, and schema management

Modeling of data (types, identifiers, entity mappings, inheritance)

Processing in batches (Persistence Context Management, batch updates, bulk updates)

Obtaining the finest techniques

Controlling transactions and concurrency

Best practices are being archived.

Finally, you'll learn about sophisticated features like caching and interceptors, which are essential for experienced Java programmers. I strongly advise experienced Java developers to take this advanced Hibernate course.

3. Hibernate and Java Persistence API (JPA) Fundamentals[UDEMY]

rating: 4.6 out of 5

duration: 7.5 hours

instructor: Infinite skills

price: $42

This is another excellent course for learning the fundamentals of Hibernate and JPA. Object-relational mapping and Hibernate concepts are covered in this online training course.

The basics of mapping annotations, mapping composite, and collection types, and entity relationships will be covered after that. Hibernate API, JPA API, complex mapping and settings, and criteria API are all covered in this video tutorial.

The Hibernate query language and Java Persistence query language will also be covered, which allow you to express SQL in a database vendor-independent manner.

4. Master Hibernate and JPA with Spring Boot in 100 Steps[UDEMY]

rating: 4.5 out of 5

duration: 13 hours

instructor: In28Minutes

price: $45

This is a hands-on course that uses Spring and Spring Boot to teach the principles of the Java Persistence API (JPA) and the Hibernate framework. Entities, Relationships, Inheritance Mappings, and Annotations are the fundamentals of JPA and Hibernate.

It also delves into JPA and Hibernates Relationships — One to One, Many to One, and Many to Many — as well as several techniques of querying data with JPA and Hibernate, including JPQL, Criteria API, and Native Queries.

You'll also learn about caching and how to use Hibernate to tune the speed of your JPA application — Solve N+1 Queries Issues.

5. Hibernate Fundamentals: Hands-On Primer With Java EE & JPA[UDEMY]

rating: 3.8 out of 5

duration: 3 hours

instructor: Syez raza

price: $45

Another good online Hibernate training course is this one, which gives a thorough introduction to Hibernate and the notion of Object Relational Mapping (ORM).

You'll also learn how to develop Java apps that link to a relational database using Hibernate.

The course also covers the most important JPA annotations for mapping classes to relational models. In a nutshell, you'll learn how to use Hibernate to install, set up, and develop Java apps.

You will learn some of the best things in hibernate and the list is as follows:

Learn all there is to know about Hibernate and why it is so important.

Create a Java application from the ground up in the Hibernate environment.

Hibernate and SQL tools must be installed and configured.

Create a Java class for persistence.

The Hibernate XML Mapping File must be created.

Create an XML configuration file for Hibernate.

Access to the MyPHPadmin back-end database and test the application.

Conclusion:

That's all about the best Udemy courses to learn Hibernate in 2025. I highly recommend them for Java developers. So we have reviewed some of the best Hibernate courses available in the market. Decide on your own will and jump into the ocean of Hibernate and Java!

3 ways to Find Duplicate Elements in a given Array in Java [Solved]

Hello guys, if you are wondering how to find duplicates from a given array in Java then you have come to the right place. This is one of the most popular coding problems from interviews and there are multiple ways to solve this problem. In this article, I will show you three ways to solve this problem. First, you will learn how to solve the problem using brute force way and then you will see how you can optimize and simplify the solution by using additional memory and using an appropriate data structure like a HashSet or Hash table. In the real interview, you may need to solve this problem in some constraints like you cannot use additional memory or additional data structure that's where knowing multiple ways to find duplicate in Java array really help.

How to Perform Union of Two Linked Lists Using Priority Queue in Java? Example Tutorial

Firstly, The Linked list shall be introduced, then how priority queue in java is been used, Then after that, we shall carry on on the main task.  What is LinkedList? A linked list is a data structure in which each node(element) holds the reference to the next node. You don’t need to go through the struggle of searching the exact node in the link list, all you have to do is go through the previous node because it holds the reference to the next node, then you can easily access it.

3 ways to Count words in Java String - Google Interview Questions with Solution

Today, I am going to share with you Java interview questions from Google, which were asked to one of my readers during the telephonic round. How do you count the number of words in a given String in Java? You can count words in Java String by using the split() method of String. A word is nothing but a non-space character in String, which is separated by one or multiple spaces. By using a regular expression to find spaces and split on them will give you an array of all words in a given String. This was the easy way to solve this problem as shown here, but if you have been asked to write a program to count a number of words in a given String in Java without using any of String utility methods like String.split() or StringTokenizer then it's a little bit challenging for a beginner programmer.

Top 6 Courses to Learn Time Series Analysis in 2025

Time Series is a mathematical concept that consists of data points indexed according to a timed order. A Time-Series can also be defined as a sequence of events taken at successive equally spaced points in time. In Time Series Analysis, we analyze a sequence of data points collected over an interval of time. You should be able to record data points at consistent intervals over a set period. This is different from just recording data points at random intervals. A Time Series Analysis can show how different variables change over time. It provides an additional source of information and a set order of dependencies between the data. Time Series data can also be used for forecasting and predicting future data based on historical data.

3 ways to check if a String contains SubString in Java? IndexOf, contains, and lastIndexOf Example

You have given a String and a subString or a character and you need to find out whether given String contains the given character or substring, how would you do that? Well, there are three main ways to search String in Java, the contains() method, the indexOf() method and the lastIndexOf() method, all from java.lang.String class. First method, contains() accepts a CharSequence, superclass of String and return true if that CharSequence appear on the String you have called. The indexOf() and lastIndexOf() are similar method and both return the index (zero based) from where the given subString or character appear in the String you have called. Only difference between indexOf() and lastIndexOf() is that if given substring appear multiple time then they will return difference index, otherwise both will return the same index. Similarly if given sub-string is not present in the String, both will return -1 and contains() will return false.

How to make Immutable class in Java? Mutable vs Immutable Objects

How I make immutable objects in Java? I've always thought that all objects are immutable, because if you change the content of an String example, it will always create you an new String object and point to that. However later I found that String is a special class and its specially designed as an Immutable class because its often cached. Obviously you cannot cache anything which is not constant and that make sense why String is Immutable in Java. But this encouraged me to learn more about Mutable and Immutable class in Java and how to create a custom Immutable class in Java.

Difference between StringTokenizer and Split method in Java? Example

There are multiple ways to split a String in Java, but two of the most common ways are by using StringTokenizer and the split method of String class. You can use either one of them, but when to use which one? This short article will give you some details about StringTokenizer and Split method in Java to decide which one to use.

1) The StringTokenizer is legacy, Prefer split() as more chances of its performance getting improved as happens in Java 7.

2) The StringTokenizer doesn't support regular expression, while spilt() does. However, you need to be careful, because every time you call split, it creates a new Pattern object and compiles expression into a pattern. This means if you are using the same pattern with different input, then consider using Pattern.split() method, because compiling a pattern takes more time later to check whether a given string matches a pattern or not.

5 ways to Compare String Objects in Java - Example Tutorial

here are many ways to compare String in Java e.g. you can use equals() and equalsIgnoreCase() for equality check and compare() and compareTo() for ordering comparison. You can even use the equality operator == to perform reference-based comparison e.g. to check both the String reference variable points to the same object. In general, equals() is used to check whether the value of a given String is the same i.e. they contain the same characters in the same sequence or not e.g. "Groovy".equals("Groovy") will be true if you compare them using equals() method. You can also use equalsIgnoreCase() to check if they are equal irrespective of case e.g. "Apple" and "apple" will be the same if you compare them using equalsIgnoreCase() method.

Top 5 Courses For SAT Test in 2025 - Best of Lot

Hello guys, if you are preparing for SAT test and looking for best online courses for SAT then you have come to the right place. In this article, I am going to share best SAT online courses. But, Before we get to the 5 best courses that will help you pass the SAT exam with flying colors, let me tell you a little bit more about what this exam really is. 

SAT, also known as the Scholastic Aptitude Test, is basically an entrance exam that is conducted by the college board. You have to give this exam if you want to pursue undergraduate studies in the United States of America. 

5 Best Courses for SAT Test in 2025

The SAT is actually a multiple-choice exam that is conducted over the paper and pencil method. The registration for SAT will be processed almost 5 weeks before the actual exam. You will need to pay almost $109 in SAT exam fees. 

The College Board conducts SAT 7 times a year. This may vary depending on your region. 

SAT is made up of two key sections: evidence-based reading and writing, math, and a writing section that is optional. You will need to answer 154 questions in 3 hours. The SAT score is widely used for gaining admission to undergraduate programs abroad. 

1. The Complete SAT Course [Udemy]

In this fantastic course, you will learn about all the core features of different mathematical equations and the SAT exam. You will also become very good at different math principles. You will be able to master SAT by the end of this course.

This amazing course will also help you polish your skills for the SAT. 

Course Duration: 2 hours

Course Rating: 4.6 stars 

Course Instructor: Robert Hubbard

Course Price: $25

2. The New SAT Video Series [Udemy]

This is a great course that will help you take your skills in logical reasoning to another level. You will be able to do this by making use of things like marathon questions. The course will teach you how to increase your skills for clearing the SAT.  

This course will act as a great brief introduction to the amazing world of SAT. It is perfect for beginners as you will learn about the exam from absolute scratch. You will learn exactly what it is and what you can do with it. 

Course Duration: 2 hours

Course Rating: 4.4 stars out of 5

Course Instructor: Jesse Patrick

Course Price: $25

3. New SAT Reading 800 [Udemy]

This is an exciting course that will teach you everything you need to know about the basics of the SAT in the shortest time possible. The course will also teach you everything you need to know about the different questions that you will see in the exam. 

In this course, you will learn about all the core features of the SAT.  You will be able to master almost all the subjects in the exam syllabus. 

Course Duration: 1 hour

Course Rating: 4.6 stars out of 5

Course Instructor: Phillip Lee

Course Price: $25

4. How To Get A Perfect SAT Score [Udemy]

This course will act as a great brief introduction to the amazing world of the SAT. It is perfect for beginners as you will learn about the exam from absolute scratch. You will learn exactly what it is and why you should attempt it. The course will also teach you everything you need to know about the core features of the SAT exam. 

Using this exciting course, you will be able to learn the fundamentals of SAT from a current student who cleared the same exam. You will also be able to start your amazing journey by making use of this fantastic course. 

Course Duration: 2 hours

Course Rating: 4.5 stars out of 5

Course Instructor: PrepExpert

Course Price: $20

5. Beat The SAT Math [Udemy]

This is a fantastic course that will teach you everything you need to know about the SAT along with the different types of questions you will face from absolute scratch. In this way, it is absolutely perfect for complete beginners.  

In this wonderful course, you will also learn everything you need to know about the different components of the MCAT exam. You will start the course by learning about the basics of psychological reasoning. Then you will move on to understand what exactly is the MCAT exam.  

Course Duration: 3 hours

Course Rating: 4.6 stars out of 5

Course Instructor: Mourad Kattan

Course Price: $20

Frequently Asked Questions

1. What is the SAT?

SAT, also known as the Scholastic Aptitude Test, is basically an entrance exam that is conducted by the college board. You have to give this exam if you want to pursue undergraduate studies in the United States of America. 

2. Is SAT multiple-choice?

The SAT is actually a multiple-choice exam that is conducted over the paper and pencil method. The registration for SAT will be processed almost 5 weeks before the actual exam. You will need to pay almost $109 in SAT exam fees. The College Board conducts SAT 7 times a year. This may vary depending on your region. 

3. What is the syllabus for SAT?

SAT is made up of two key sections: evidence-based reading and writing, math, and a writing section that is optional. You will need to answer 154 questions in 3 hours. The SAT score is widely used for gaining admission to undergraduate programs abroad. 

Conclusion

If you liked this list of the 5 best courses to learn about the SAT, feel free to share it with your friends and family. I have no doubt that the courses in this list will transform you from a complete beginner to an SAT expert within a matter of weeks or months. There are a wide variety of courses in this list that will be beneficial to both absolute beginners as well as intermediate-level learners. 

You can also drop a comment if you have any doubts about the SAT, and we will get back to you as soon as possible. 

4 ways to read String from File in Java - Example

Just like there are many ways for writing String to text file, there are multiple ways to read String form File in Java. You can use FileReader, BufferedReader, Scanner, and FileInputStream to read text from file. One thing to keep in mind is character encoding. You must use correct character encoding to read text file in Java, failing to do so will result in logically incorrect value, where you don't see any exception but content you have read is completely different than file's original content. Many of the method which is used to read String by default uses platform's default character encoding but they do have overloaded version which accepts character encoding. 

How to download a file using HTTP in Java? Example

Hello guys, if you are looking for tutorial to understand about how to download a  file using http in Java to have deep knowledge of java basics then you will definitely learn from this article. uploading and downloading files are common task but many Java developer are not aware about how to complete that. They don't know about HTTP and how to send and receive data using HTTP. Many of them also doesn't know about HttpClient which was added in JDK 11 as well as third party libraries like Apache HttpClient which you can use before JDK 11. Anyway, don't worry, we are again here with new article that is on download file using http will give all basics about the topic to our viewers or readers.  Let's start with an example first.

How to read CSV file in Java without using a third-party library? FileReader Example Tutorial

Hello guys, as you learn Java, one thing that comes up early and often is reading from/ writing to files, and doing something useful with that data. This is also one thing which you will keep doing and also forgetting very soon, if you are not then you have good memory as I always forget it and then I do google search to find my own articles. If you read this blog then you know that in the past, I have shared how to load CSV file using OpenCSV library as well how to load a CSV file with header using Jackson but a lot of you asked me how to do this without using any third party library like Jackson or OpenCSV. So, I thought to write about this article and I actually written but forgot to publish it for a long time. But I today I found it and publishing it now, it still works well. 

How to write to a File with try-with-resource in Java? Example Tutorial

Hello Java programmers and all people learning Java, if you are familiar with try-wit-resource statement then you know that its a great language functionality and tool to open files, sockets, streams, and network connections or any resource which are require closing. Before try-with-resource was introduce in Java 7, Java developers have to manually write try catch finally block to close the connections for both success and failure cases to prevent resource leak but it was also tricky and many programmer make mistakes which actually resulted in resource leaks. One common example of that is running out of file descriptors which is used for both opening file and socket in Java.  

How to recursive copy directory in Java with sub-directories and files? Example

Hello guys, it's a common requirement in Java to copy a whole directory with sub-directories and files but it's not that straightforward, especially not until Java 7. JDK 7 introduced some new file utility methods as part of Java NIO 2 which we will use in this article to show you how to recursively copy a whole directory with sub-directories and files in Java. I'll also show you how you can use Apache Commons if you are not running on Java 7 or higher versions. Basically, You can copy a file or directory by using the copy(Path, Path, CopyOption...) method. The copy fails if the target file exists unless the REPLACE_EXISTING option is specified.

How to check if a File exists in Java with Example

Hello guys,  if you are working in Java for a couple of years, then you have come across a scenario where you need to check if a file exists or not. This is often required while writing defensive code that writes or reads from a file. While there is a method to check if a file exists in Java or not, it's not straightforward to use because it returns true if a given path represents a file or a directory. Yes, I am talking about the File. Exists () method of the java.io package. This method is the key method to solve this problem, but you need to keep in mind that it returns true if a given path exists and it's either file or directory. 

How to append text to file in Java? Example Tutorial

Hello guys, In this article, I'll teach you how to append text to a file in Java. Earlier, I have taught you guys how to create a file and write text into it, but, append is totally different than creating a new file and writing data into it. In the case of append, the file already exists and you just add text at the end of the file. One popular example of appending text into a file is a log file that is constantly updated because your application continuously appends log details into it. While you don't need to create a logging framework here, just knowing how to append text into an existing file in Java is useful for Java programmers of all kinds of experience.

How to work with Files and Directories in Java? Example Tutorial

The File API is one of the important parts of any programming language or API and even though Java's file API both new and old, is powerful, they are not intuitive enough compared to other languages like Python. Apart from knowing the essential classes and abstractions e.g. File, InputStream, OutputStream, Reader, Writer, Channel, etc, you also need to know and remember some nitty-gritty detail to avoid subtle issues. There are many articles out there on the internet which can teach you how to read and write data from the file but there are very few which will tell you to do it in the right way.