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Posted by JBT
April 20, 2012

Interface in java

Defining a Contract means to create an Interface. This Contract states what a Class can do without forcing how it should do it. In this Java Interface Tutorial, we will talk about Interfaces. How to create one and rules applied to Interfaces.

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Posted by JBT
April 20, 2012

Local Variable in Java

Let's learn more about local variables in Java. Variables that are declared inside Methods in a Java program are called local variables.

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Posted by JBT
April 20, 2012

Instance Variable in Java

Instance variable in Java is used by Objects to store their states. Variables that are defined without the STATIC keyword and are Outside any method declaration are Object-specific and are known as instance variables. They are called so because their values are instance specific and are not shared among instances.

If a class has an instance variable, then a new instance variable is created and initialized to a default value as part of the object creation of class or subclass.

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Posted by JBT
April 20, 2012

Java Reference Variable

Reference variables are used to refer to an object. They are declared with a specific type that cannot be changed.

Types of reference variables

  • Static Variable
  • Instance Variable
  • Method Parameter
  • Local Variable

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Posted by JBT
April 19, 2012

Java String Tutorial

A string is one of those Object which is used heavily in Java. And this is the reason why String has unique handling in Java(String Pool).

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Posted by JBT
April 19, 2012

Java Static Keyword

What is Static

Static is a Non Access Modifier.

Applicable to

The Static keyword can be applied to
  • Method
  • Variable
  • Class nested within another Class
  • Initialization Block

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Posted by JBT
April 19, 2012

Java Array Tutorial

Java Array is a data structure type which is used to store multiple variables of the same type. Arrays can hold Primitives as well as Object. The variables in the array are ordered but not sorted. Each element in the array have an index and starting index for element in array is 0.

An array will always be an Object in Heap. No matter what it store, primitives or Object.

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Posted by JBT
April 18, 2012

Spring Security LDAP Authentication Tutorial

Here we will learn about spring security ldap authentication, authorisation and security related stuff with the help of LDAP Server. Active directory is an LDAP implementation by Microsoft for Windows. Current tutorial will use AD as LDAP server.

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