Java Core Classes and Threads

It creates an RSA PKCS#1 version 1.5 signature.

This class in the java.net package is used to read a stream of data that is generated by a network connection and produce an object.

This class from java.net.URL package transforms a URL string into an object that can then be manipulated using associated methods.

The Scanner class is in java.util package, which is imported with import java.util.*. Option A incorrectly imports java.lang (auto-imported), Option B imports java.io for I/O operations, and Option D imports java.awt for GUI components. Scanner is specifically a utility class for text parsing.

Math.random() is the standard Java method that returns a double between 0.0 and 1.0. Option B (getRandom) doesn't exist in Java API. Option C (setRandom) is not a standard method. Option D (random) alone isn't valid without Math. prefix.

In this .NET cryptographic class, the exception that is thrown when an error occurs during a cryptographic operation.

This method is used in multithreaded programming to determine if a thread is still running.

This type of exception class is used to deal with assignment to an array element of an incompatible type.

This method of Thread class is used to obtain the priority of a thread.

This stream class is an input stream that contains methods for reading the java standard data types.

This method of Float class is used to return a true value if the invoking object contains an infinite value.

This value in compareTo() method of String class is used to state that the invoking string is greater than the string passed as argument.

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