Explain wrapper classes in java?
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Is this valid in java ? Can we instantiate interface in java?
What is string buffer?
What is a concrete classes? Is Java object class is concrete class?
Explain about instanceof operator in java?
Ducking is automatic in checked exception?True or false
What is immutability in java?
Can each java object keep track of all the threads that want to exclusively access it?
Difference between String and StringBuffer.
In multi-threading how can we ensure that a resource isn't used by multiple threads simultaneously?
What are user defined exceptions?
What is static keyword?
What is the main purpose of java?