Core java Archive

In this post ,we will try to understand hashcode() and equals() method in java. Java HashMap: HashMap in java How HashMap works in java hash and indexfor method in HashMap hashcode and equals method in …

In this post, we will see about Luhn Algorithm in java Introduction , also known as or algorithm, is a simple checksum process for validating various identification numbers such as credit card numbers, …

In this post, we will see about regex to find currency symbols in a text. You can use below regex to find currency symbols in any text. \\p{Sc} Each unicharacter belongs to certain category and …

In this post, we will see how to get and set fields using reflection in java. can be used to get/set fields(member variables) at runtime using reflection. Get all fields of the class All fields …

In this post, we will see how to invoke constructor using reflection in java. You can retrieve the constructors of the classes and instantiate object at run time using reflection. is used to instantiate …

In this post, we will see how to convert List to Map using Stream in java 8. Collectors’s can be used with Stream to convert List to Map in java. Consider a class Named …

In this post, we will see how to add character to String in java. There are multiple ways to add character to String. Add character to the start of String You can add character at …

Java 8 has introduced a lot of new features such as lambda expressions, stream, Method references etc. In this post, we will see what are Method references and how can we use it. I will …