Posted On: Apr 11, 2020
Collections in Java are a group of individual objects represented as a single unit. Java presents Collection Framework which describes several groups and interfaces to express a collection of things as a particular unit. Using collections you can achieve all the operations that you perform on data such as searching, sorting, insertion, manipulation, and deletion.
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OOP concepts in Java are the main ideas behind Java's Object-Oriented Programming. They are an abstraction, encapsulation, inheritance, and polymorphism. There are four main OOP concepts in Java. The...
A JOIN condition is applied to join rows from two or added tables, founded on a similar column connecting them. The various kinds of the JOINs in SQL:LEFT (OUTER) JOIN: Returns every record from ...
Abstract Class: An abstract class is a class that is declared abstract, it may or may not include abstract methods. When an abstract class is subclassed, the subclass usually provides implementations ...