Interview Questions - Core Java

The read() method returns -1 when it has reached the end of a file.

No, an object cannot be cast to a primitive value.

A non-static inner class may have object instances that are associated with instances of the class's outer class. A static inner class does not have any object instances.

An object's lock is a mechanism that is used by multiple threads to obtain synchronized access to the object. A thread may execute a synchronized method of an object only after it has acquired the object's lock. All objects and classes have locks. A class's lock is acquired on the class's Class object.