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Different types of inner classes October 2, 2006

Posted by Allu in JAVA.
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Nested top-level classes– If you declare a class within a class and specify the static modifier, the compiler treats the class just like any other top-level class. Any class outside the declaring class accesses the nested class with the declaring class name acting similarly to a package. e.g., outer. inner. Top-level inner classes implicitly have access only to static variables. There can also be inner interfaces. All of these are of the nested top-level variety.

Member classes – Member inner classes are just like other member methods and member variables and access to the member class is restricted, just like methods and variables. This means a public member class acts similarly to a nested top-level class. The primary difference between member classes and nested top-level classes is that member classes have access to the specific instance of the enclosing class.

Local classes – Local classes are like local variables, specific to a block of code. Their visibility is only within the block of their declaration. In order for the class to be useful beyond the declaration block, it would need to implement a more publicly available interface. Because local classes are not members, the modifiers public, protected, private, and static are not usable.

Anonymous classes – Anonymous inner classes extend local inner classes one level further. As anonymous classes have no name, you cannot provide a constructor.

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Comments»

1. ravi - October 9, 2008

was pretty much useful thanks man

2. rastogha - July 2, 2009

nice article .. another useful post for others could be http://java-questions.com/InnerClass_interview_questions.html

3. sdfsdfsd - December 12, 2009

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4. sdfsdfsd - December 12, 2009

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5. sdfsdfsd - December 12, 2009

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6. sdfsdfsd - December 12, 2009

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7. java beginner - April 7, 2011

Little confused. Good if provided example code and walk on it.

8. nikhil - May 23, 2012

Its too Good


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