Java Core Classes and Threads

IOException is not a subclass of RuntimeException class, this class is a Subclass of Exception class.This exception is thrown when invalid input/output are given.So this is the correct answer as this is not a subclass of RuntimeException class.

There is no function defined in Scanner class to take character input. So there is no function named nextChar().So this is the correct answer.

This option is correct because there is no method defined fillCircle() in Graphics class.So this option is correct.

This is false choice because JList doesn’t generate an ActionEvent. When we click an item in JList ListSelectionEvent is generated.So this is the true choice according to the question.

This is correct answer because all of the given methods are valid in java event handling.

This is not a JVM exception. It is a programmatic exception.

This method of the BufferedReader class is used to read a character from the console.

This is a false statement as it is not an exception. It is an error.

Yes, this method is used to return the primitive value of the boolean object.

Yes, this method is used to return the value to which the key is mapped in the dictionary.

This class belongs to java.io package.

it is derived from the Object class and not a part of collection interface.

Explicit pointers cannot be declared in JAVA.

System.gc() kindly asks the sytem to perform a garbage collection. Javadoc says:Runs the garbage collector

This method of InetAddress class returns a string that represents the host address associated with the InetAddress object.