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Ans. Yes we can have a main method with string[] argument in every class of an application. When we execute an app we specify the starting point i.e the class that will get the control first and hence main method of that class gets executed.
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Ans. No, Java doesn't have a sizeOf operator. In C / C++ , its required to determine how much memory allocation is required which is not the case with Java. Java handles memory allocation and deallocation intrinsically.
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Ans. We try to look for errors in the last n minutes when the issue occurred. If the issue is still occurring intermittently, We tail the logs for different application server instances to see the error snippets coming in the live logs.
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Ans. Yes we have created System as well as Log monitoring scripts to keep track of exceptions. We are also using a tool that will inform the stake holders if an exceptional event occurs with the system.
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Ans. We can follow the same design which we follow in singleton Classes. We can have a static counter that will keep the count of number of objects already created, We can keep the constructor private and being called through the static method. We can keep incrementing the counter before calling the constructor and put a check to call only if it's lesser than n.
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Ans. Yes its useless if we are not going to use its objects within Hash collection, For example - HashSet , HashMap. HashCode is used internally by these collections for Search.
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Ans. filter tag speficies the filter name and respective class for handling filter action whereas filter mapping maps the filter to the url patterns ( specifying the url that needs to be intercepted )
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Ans. Similarities - Both and Object Oriented and Statically typed languages that runs on JVM.
Difference - Unlike Java, Scala is a Pure Object Oriented language as it doesn't use primitives and static variables.Unlike Java 8 which supports some functional programming concepts, Scala provides support for all functional programming concepts. Java 8 does not support Pattern Matching, Function Currying etc
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Ans. Scala is a general purpose programming language that runs on JVM. Its completely inter operable with Java, purely object oriented and has full support for functional programming and a strong static type system.
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Sample Code for inner class
In Case a method is declared to throw an exception , We can only use a call to that method if ...
