Java

To reverse a list in Java, use the “Collections.reverse()” or “add() and remove()” methods or Recursion, ListIterator, Iteration, and Stream API approaches.

To return an array in Java, use the “return” keyword before the array name after the array declaration and initialization and use the “for” loop to select the array elements.

To check if a file or directory exists in Java, use the “exists()” method provided by two utilities “java.nio.file.Files” or “java.io.File”.

Dates in Java can be compared using the “compareTo()” method, the “Date” class, the “Calendar” class, or via the “LocalDate” class.

Java contains the “Collection” framework which includes multiple classes and interfaces for representing a group of objects. This collection enables storing the group of objects as a single unit. This interface contains the “List” interface and the “ArrayList” class which can be used to perform multiple operations such as sorting, insertion, deletion, and manipulation of …

A static method in Java refers to a method that is related to a class rather than a class instance and can be accessed without creating an object of the class.

StringBuilder “append()” method appends string representation of passed argument to sequence and appends boolean, int, float, double, char, string, etc values.

Java Multithreading enables concurrent execution of two or more code parts to use maximum CPU and can be done by extending Thread class or Runnable interface.