What is an immutable object?
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What is the use of string and stringbuffer?
How to prevent a field from serialization ?
Can a top level class be private or protected?
what happens when a thread cannot acquire a lock on an object? : Java thread
What are the advantages of arraylist over arrays?
What is the difference(or similarity if there are some) between object and a variable?
What is difference between hash mapping and hash table?
Explain importance of inheritance in java?
What is a finally block? Is there a case when finally will not execute?
What is an object’s lock and which object’s have locks?
what is the difference between pagecontext and servletcontext?
How to instantiate static nested classes in java?