What is tree in java?
What is a double?
what are upcasting and downcasting?
what is abstract method with example?
Name few java 8 annotations ?
When do I need to use reflection feature in java?
What is math floor in java?
What is serialization in java?
Are constructors methods?
Why do we need main method to execute a java program?
Give me some null interfaces in java?
What is class forname used for?
What is the purpose of a statement block?