In this example, you will find the details and concept of Local and class variables, initialization and their scope. /* * local variable must be initialized before attempt to use them. * Java will initialize instance variable for you !!! * Java does not give local variable a default value. */
In this Example, you can find the Cloneable interface and Clone method usage in java. and also various ways to create object in java. /* * Object cloning is a way to create exact copy of an object. * To use clone() method of java.lang.Cloneable interface, class must implement it else CloneNotSupportException will be thrown.… Read More »
In this example you will find Anonymous Inner class concepts, Inner class concepts in java, and also some tricks about Interface. /* * TestAnonymousInnerClass.java * * This Example includes… * 1. Method inside Interface with body. * 2. Inner Class inside Interface. * 3.… Read More »
In this example, you will find the concept of Inner class in java, how to declare and access the inner class properties. Access modifiers and their effect on inner class properties. Java doc for Inner class in given Here : Inner class in java
This article covers basics of static keyword, static methods and static variables. /* * STATIC METHODS : * 1. Static method can not access non-static (Instance) variable or method. * 2. Static method can not be overridden they are redefined. */
Constructor Demo code… /* * 1. Constructor can use any return type. * 2. Constructor name must match the name of class. * 3. constructor must not have a return type. * 4. If you see a method with return type having same name as class than it is just a method. * 5. if… Read More »
Overloading v/s Overriding methods… class Operator { public int operation(int x, int y) { System.out.println(“First method invoked from parent class.”); return x + y; }… Read More »
Use of access modifiers and class properties… /* * Question : value of rightFirst will be always one third of leftFirst or not ? * NO because both are public, no need to use setLeft() method for that * those are directly accessible…:p * but it is true in case of class ValueSecond */ class… Read More »
Visibility of the properties of class for different access modifiers ——————————————————————————————————————– 1) From the same class Public , Protected, Private and Default 2) From any class in same package Public, Protected and Default 3) From a subclass in same package … Read More »
Testing of equals() method and overriding equals() method of Object class. // Overriding equals() method will make an object identical // to use a object as a key, one has to override equals() method of Object class public class EqualsTest { public static void main(String[] args) { … Read More »