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integer value in ja*a. below are the ways to get it done. continue reading.. here are some better way to create and initialize a arraylist or list in ja*a. these are convenient methods if you want to initialize the handling. let us try to understand that what are new features and why a separate api was required for date and time handling. here is a restful web service to get and search states and territories of a country. this web service can be used for testing, learning or can be consumed for any web application. continue reading.. generics, annotations in ja*a 5.0. lambda expressions are anonymous method similar to anonymous clas*es in ja*a. list interface. these two arraylist and linkedlist implementation has their own advantage and disadvantages and should be used based on the need. here is a comparison and difference between these two implementations. unnecessary statement inside the loop, it may reduce the performance. there are various points if we care, while coding then we can improve the performance. the main focus area of optimization is to fine-tune conditions, use fast operators, object creations etc. many times we need to convert a ja*a object to xml string or xml string to object, in that case xstream is good choice specially if we. are working with third party ja*a clas*es where we don't have source of clas* to change.