Category: Blog

Interfaces provide more sophisticated ways to organize and control the objects in your system. The interface keyword takes the abstract concept one step further. You could think of it as a “pure” abstract class....

Below are the advantages of OOP: 1. Simplicity: software objects model real world objects, so the complexity is reduced and the program structure is very clear; 2. Modularity: each object forms a separate entity...

Several things happen in a particular order to ensure the object is constructed exactly: 1. First, Memory is allocated from heap to hold all instance variables and implementation-specific data of the object and its...

How to search a word inside a string? Here is the example that can search a word within a String object using indexOf() method which returns a position index of a word within the...

The Oracle Certification Program certifies candidates on skills and knowledge related to Oracle products and technologies. Credentials are granted based on a combination of passing exams, training and performance-based assignments, depending on the level...

What is Enum in Java? Version prior to JDK 5 lacked on feature that many programmers felt was needed : “Enumeration”. An enumeration is a list of named constants. In language such as c++,...

What is Generics? J2SE 5.0 provides compile-time type safety with the Java Collections framework through generics Generics allows you to specify, at compile-time, the types of objects you want to store in a Collection....

Synchronized blocks place locks for shorter periods than synchronized methods.

We cannot inherit a constructor. That is, you cannot create a instance of a subclass using a constructor of one of it’s superclasses. One of the main reasons is because you probably don’t want...

Java’s interface can be used to implement multiple inheritance, with one important difference from c++ way of doing multiple inheritance: the inherited interfaces must be abstract. This obviates the need to choose between different...