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Ans. An application layer is an abstraction layer that specifies the shared communications protocols and interface methods used by hosts in a communications network.
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Ans. We initialize two variables first and second to INT_MIN as,
first = second = INT_MIN
then Start traversing the array,
If the current element in array say arr[i] is greater
than first. Then update first and second as,
second = first
first = arr[i]
If the current element is in between first and second,
then update second to store the value of current variable as
second = arr[i]
then Return the value stored in second.
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Ans. Spring is a Framework where we have to Build the Configurations Manually but Springboot have default configurations that allow faster bootstrapping. Spring Framework requires a number of dependencies to create a web app. Spring Boot, on the other hand, can get an application working with just one dependency.
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Ans. A List is an child interface of collection interface in java where as Linked list is and implementation class of List interface which has doubly linked as a underlying data structure
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Ans. If there is a situation to remove duplicates values from an arrayList. Developer implemented using legacy for-loop where I suggested to use Linked hash set to remove duplicates from the list.
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Ans. As String is immutable so by maintaining pool area we can refer the object to same area if they are with same content. But when it comes to string buffer or builder then due to mutable property if we do so then all the objects referring to that area will from now has new content.. So as to avoid this pool is present only in string.
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Ans. we use serialization when we send response to client in JSON format.(the process of converting model object into json is nothing but serialization
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