Static is a keyword in Java used to represent the class members. It can be used with variables, methods, initializer blocks, and nested classes. Types of class members: Static data members. Static initializer block. Static method. Static nested class. 1. Static data members: Data members declared with static keywords are known as static data members. … Read more
Super is a keyword in Java that refers to the immediate superclass object. Use of super keyword in Java: super can be used to call the immediate super class constructor (constructor chaining). super can be used to call an immediate superclass method on a subclass object from a subclass method. super can be used to … Read more
Java Instance Initializer block is a mechanism provided by the Java compiler to define a group of statements common to all constructors in a single place. At the compilation time, the compiler moves these statements at the beginning of all constructors after super. It can also be used to initialize the instance variable. Java Instance … Read more
Java this keyword refers to the current instance of the class. Every constructor and all non-static methods in Java have this as an implicit parameter. Note: When n numbers of parameters are passed in a method then from the JRE point of view n+1 number of parameters are passed in the method. One additional parameter … Read more
Package class provides information about a package like a package name, implementation title, etc. Java Package class Example package com.w3schools; public class PackageClassTest { public static void main(String args[]) { Package package1 = Package.getPackage(“java.lang”); System.out.println(“package name: ” + package1.getName()); System.out.println(“Specification Title: ” + package1.getSpecificationTitle()); System.out.println(“Specification Vendor: ” + package1.getSpecificationVendor()); System.out.println(“Specification Version: ” + package1.getSpecificationVersion()); System.out.println(“Implementaion … Read more
Static import is a feature that provides the facility to access static members of a class directly without using a class name. Java Static import Example package com.w3schools.display; public class Display { public static void displayText(String text){ System.out.println(text); } } package test; import static com.w3schools.display.Display.*; public class Test { public static void main(String args[]){ displayText(“Hello … Read more
Access modifiers Access modifiers are keywords used for defining the accessibility of classes, methods, and data members. Types of access modifiers. Private. Default Protected Public Private: Data members, methods, and constructors that are declared with private access modifiers can be accessed into that class only. package com.w3schools; class Student { //private members of the class … Read more
The package is a namespace that is used to group logically related classes and interfaces. Advantages/Benefits of the package in Java A package provides a unique namespace. A package provides access protection. A Package provides a grouping of logically related classes and interfaces that are easy to maintain. How to create a package? A package … Read more
Constructor A constructor is a special member (method) of a class that is used to initialize the state of an object. It provides the values to the data members at the time of object creation which is why it is known as a constructor. Characteristics of the constructor A constructor has the same name as … Read more
The dictionary meaning of interface is “A point where two systems, subjects, organizations, etc., meet and interact.” Interface in the real world You can see a number of interface examples. Let us take the example of a TV. You press the change channel button of the TV remote and the channel is changed. Here remote … Read more