What is constructor chaining and how is it achieved in java?
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what is difference between Action messages and Action errors?
Can a private method be declared as static?
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if a java file without any source code is valid java file?
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Can we change the scope of the overridden method in the subclass?
Write a program in java to calculate the difference between the sum of the odd level and even level nodes of a binary tree.
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Why spring singleton is not thread safe?