What is the purpose of default constructor?
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Explain final, finalize() and finally?
What are the advantages and disadvantages of reference counting in garbage collection?
What are selection structures?
What is aggregation and composition ?
Is singleton class thread safe?
What do you mean by byte code?
What is externalizable interface?
When we will use an Interface and Abstract class?
Should a main method be compulsorily declared in all java classes?
What are the uses of java?
What is the difference between sleep and wait in java?
Is an array a vector?