Core java

Most common interview questions are <code>How HashMap works in java</code>, “How get and put method of HashMap work internally”. Here I am trying to explain internal functionality with an easy example. [crayon-613b3c4d213d3892949312-i/]  is one of the most used Collections in java.Rather than going through theory, we will start with example first, so that you will […]

In Python, there are a lot of libraries that are used for data visualization. One of the libraries is the Matplotlib library. The Matplotlib library is a very good library when it comes to data visualisation in python. With the help of this library, many types of graphs and visual representations of the data can […]

There are various data structures in Python that can store multiple items of multiple data types like string, float, integer, list, set, etc. at once. In a list, items can be changed, modified, deleted, and called at any time. All these operations can be performed on a list because all the elements in a list […]

In this post, we will see how to get current year in Java. Using Date and SimpleDateFormat The Date class was introduced in Java 1.0 and provided different approaches to work with time. The SimpleDateFormat inherits from DateFormat and is mainly used to parse a date to text. You can provide your custom pattern to […]

In this post, we will see how to remove substring from String in java. There are multiple ways to remove substring from String in java. Using String’s replace method to remove substring from String in Java This method belongs to the Java String class and is overloaded to provide two different implementations of the same […]

In this post, we will see how to break out of nested loops in Java. Using break (will break inner loop) It is very important to understand how nested loops work to ensure that applying break will output the desired result. If you are a novice with nested loops, I am going to make the […]

Java inbuilt LinkedList Java inbuilt LinkedList class uses doubly linked list as internal data structure to store its elements. It is subclass of AbstractList and implements List and Deque interfaces. Insertion and deletion of elements is faster than ArrayList as it interally uses double LinkedList. Print LinkedList using a for loop The most common method […]

In this article, we will see how to print HashMap in java using different method. Print from the HashMap Reference This is the most basic and easiest method to print out HashMap in java. Pass the HashMap reference to the System.out.println, and the HashMap will output the key-value of the elements enclosed in curly brackets. […]

We often have to check if a string contains a substring or not in a case-insensitive manner. There are multiple ways to do so. In this article, we will take a look at these methods for java String contains Ignore Case checks. Next, we will look at each method in detail. Using String.toLowerCase() One of […]

If you have worked with Java programs before, you know that all Java programs start by running the main() method(public static void main(String[] args)). The main() method is the entry point. The signature of the main method is fixed, and each portion of the statement has significance. Why is the main method so important? The […]