Real Tech Hacks

String Manipulation in Java for competitive coding.

Replace methods in string class https://beginnersbook.com/2013/12/java-string-r…

Interface in java

Rules of interface * An interface is created by using a…

Abstract keyword

Abstract class 1. We need to declare the abstract class…

Polymorphism

There are two types of polymorphisms 1. Compile time polymorphism (Method Overl…

Overloading vs Overriding

Overloading Overloading occurs when two or more Methods in one class have same …

Inheritance

Hare class Dog and Cat have some common properties. S…

Java Naming Convention

Static Keyword

Example…

Call by Value vs Call by Reference

Constructors

Constructors The ma…

Set, HashSet and TreeSet

HashSet Syntax Set < Data type > setName = new H…

Dynamic Array

Update use import java.util.ArrayList to work properly The arrays…