Java Enumeration

Java Enumeration Before the versions of JDK 5, there lacked one feature that many programmers felt was needed, this is the Enumeration. It is a list of named constants. It is supported by most other programming languages. Though Java offers the similar type of features that provide somewhat similar...

Read More

Java Autoboxing and Annotation

Java Autoboxing and Annotation With the beginning of JDK 5, Java added two more important features; Autoboxing and Auto unboxing. These features are important and play a very important role in dealing with primitive data types. In this chapter you will learn about how to use these features within a Java source code. What is boxing in Java? The automatic adaptation of primitive data types...

Read More

Java Method Overriding

Java Method Overriding Declaring a method in subclass which already exists there in parent class is known as method overriding. When a class is inheriting a method from a super class of its own, then there is a option of overriding the method provided it is not declared as final. The advantage of using overriding is ability to classify a behavior that’s specific to the child class and the child...

Read More

Java Aggregation

Java Aggregation Aggregation can be said as a relation among two classes that is best described as a has-a and whole/part relationship. It is a more specialized version of the association relationship. Now what is association? In Java, when you think of a class having that has member of different type, then there an association can be formed. In a Java class, where there lies...

Read More

Java Packages

Java Packages It is repeatedly said that one of the main features of the Object Oriented Programming is the ability to reuse the code already written by the programmer. One way of achieving is by extending class and using the interface. It has a limitation. What will you have to do if you have to use a class from another program without physically copying them into the program at the...

Read More

Java Interface

Java Interface In the chapter of Inheritance, earlier you have learnt about classes and how they can be inherited by other classes. There, you have also learned about various types of inheritance and pointed out a odd thing that Java does not support multiple Inheritance. That is Java classes cannot have more than one super class, i.e. the technique shown below is not permitted by Java. Example: class...

Read More