Archives: Core Java

By Value or By Reference Primitive variables are passed by value in a method and their values don’t change in calling method. Changes in the reference variables which are done in the called method, are also seen by the calling method. Loading, Linking and Initialization Loading Loads the binary representation of class. Linking Verification Preparation … Read more

Static Members Static members are class level members. Creating Object These do not need an already existing object to be used. Used to distinguish class level variables from local vari Method Overloading Same method names in a class having different arguments. Useful in cases where the functionality desired is similar E.g. public double calculateTriangleArea(int base, … Read more

Encapsulation and Access Control Encapsulation Access Control Modifiers Public Private Protected Default The this Keyword We use “this” keyword from any method or constructor to refer to the current object Used to distinguish class level variables from local variables E.g. this.color, this.area etc Encapsulation Encapsulation is one of the four fundamental OOP concepts, along with … Read more

Overview Object Class System String Classes Arrays Boxing & Unboxing Varargs format & printfMethods Object java.lang.Object Represents a Java Object All classes are descendants of Object Class. Some methods protected Object clone() public Boolean equals() protected void finalize() Characteristics Identity: Each object has a unique identity. State: Objects have attributes that define their current state. … Read more