Java Core Classes and Threads

This method of ThreadGroup class is used to return the number of groups for which the invoking thread is a parent.

This method of Package class is used to return a true value if the invoking package is sealed, otherwise it returns false.

This object is used in java to plug around the network and have a standard way of delivering the payload.

This keyword is used in multithreaded programming to ensure that no two threads access the same object simultaneously.

This method is used to ensure that the buffer capacity is not less than the specified minimum.

This method returns the name of the invoking package.

The drawImage() method in the Graphics class is used to display images in Java applets. The other options are misspelled or incorrect.

Java has two main types of threads: user threads and daemon threads. User threads are created by the application and prevent the JVM from exiting until they complete. Daemon threads run in the background and don't prevent JVM exit - they terminate when all user threads finish. The question asks for 'types' rather than specific thread priorities or states.

This class in the java.net package makes object able to be manipulated as String objects.

This file generated by the command idltojava Stock.idl implements the type operations for the interface.

This class in the java.net.URL package takes a string of text and turns it into the MIME format.

This object in the java.util.EventObject is generated when components are added to or removed from a container.

This object in the java.util.EventObject is generated when a component is activated.

This object in the java.util.EventObject is generated when a component receives focus for input.

This object in the java.util.EventObject is generated when a key on the keyboard is pressed.