Java Collection

Read Only Collections

I do build crazy buildings using my collection of Lego blocks. My 11 months old kid Ben curiously stares at me build it. He always wishes to get hold of it. After I complete the building when I give that to his hand, you know what the first thing he does. Modify the building blocks. Though [...]

Difference between Vector and ArrayList in java?

java.util.Vector came along with the first version of java development kit (JDK). java.util.ArrayList was introduced in java version1.2, as part of java collections framework. As per java API, in Java 2 platform v1.2,vector has been retrofitted to implement List and vector also became a part of java collection framework. All the methods of Vector is synchronized. [...]

Explain the methods used for session tracking.

Following answer is applicable irrespective of the language and platform used. Before we enter into session tracking, following things should be understood. What is a session? A session is a conversion between the server and a client. A conversion consists series of continuous request and response. Why should a session be maintained? When there is a series of continuous [...]