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-60c76870985eb108175164-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 […]

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 […]

In this post, we will see how to find and count occurrences of substring in string in java. Using the indexOf() method The indexOf() method in java is a specialized function to find the index of the first occurrence of a substring in a string. This method has 4 overloads. [crayon-60c76870996ee092648770/] We will use the […]

💡 Outline You can print double quotes in java by escape double quotes using backslash character(\). [crayon-60c768709997a054701269/] When you print on console using System.out.println, you use double quotes and whatever value inside double quotes is printed. But what if you want to actually print double quotes on console. In this tutorial, we will see different […]

Learn about Question mark operator in java. It is also know as ternary operator.

Learn about how to convert BigDecimal to Double in java

Learn about how to split String in java in different ways.

Learn about how to print ArrayList in java in different ways.

Learn about how to split String by newline in java

Learn about how to print different star pattern in java.