What is a flag and how does it work?
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what is the difference b/w static and final methods?
What will happen if non-synchronized method calls a static synchronized method and what kind of lock it acquires?
Difference between JVM and JRE?
What is class array in java?
What is an eror in java?
Every class extends object but why it is not possible for every object to invoke clone() method. ideally protected methods should be accessible from sub classes. isn't it?
How many ways can we create singleton class?
What is hash table in java?
What is thread life cycle?
What are the basic control structures?
7) Suppose there is Student class like class student { int age; string name; } We want to store these objects in a HashMap. Do we need to override any methods in Student class? If any which ones and why? what if i just override equals or just hashcode? what will be the results in both the cases?
Explain the JDB in depth & command line.