The extend keyword in Java inherits one class from another class. All the functions and the properties of the base class are also part of the derived class
The join() method of string in Java connects the declared string with a specified delimiter. It can also be used to join the elements of ArrayList, HashMaps, etc.
The ArrayList contains() method in Java searches for the required element and returns a boolean value of “true” if the element is present otherwise “false”
Various ways to remove the whitespaces from the declared string in Java are the String class, the Character class, the String Buffer, and the replace() method
Array copy in Java copies the elements of the original array in the new array. To do so, different methods are used such as copyOfRange(), array.copy() etc.
The replace() method of Strings in Java is used to replace the character present in the string and the other way is to replace the entire string.
The Stream map() method of Java uses the mapper function on all the elements of the stream and returns a transformed stream.
Null is a keyword in Java that refers to the absence of something. This keyword is implemented in different scenarios according to the needs of the program