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Inner classes help  RSS feed

mani learn
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Can some one explain me the usage of inner class ? Why are they needed and in what scenarios they are needed.? What is there usage(i read they can access variable and members of outer class is that all)
I have read the article on javaranch and other website about inner classes but could not get much .Any help with exmample would be appreciated

Thanx in advance
It is sorta covered in the JavaRanch Style Guide.
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