Java Programming - Threads
- Threads - General Questions
- Threads - Finding the output
- Threads - Pointing out the correct statements
Option B is Correct. The start() method causes this thread to begin execution; the Java Virtual Machine calls the run method of this thread.
Option A is wrong. There is no init() method in the Thread class.
Option C is wrong. The run() method of a thread is like the main() method to an application. Starting the thread causes the object's run method to be called in that separately executing thread.
Option D is wrong. The resume() method is deprecated. It resumes a suspended thread.
- Thread(Runnable r, String name)
- Thread()
- Thread(int priority)
- Thread(Runnable r, ThreadGroup g)
- Thread(Runnable r, int priority)
(1) and (2) are both valid constructors for Thread.
(3), (4), and (5) are not legal Thread constructors, although (4) is close. If you reverse the arguments in (4), you'd have a valid constructor.
- notify();
- notifyAll();
- isInterrupted();
- synchronized();
- interrupt();
- wait(long msecs);
- sleep(long msecs);
- yield();
(1), (2), and (6) are correct. They are all related to the list of threads waiting on the specified object.
(3), (5), (7), and (8) are incorrect answers. The methods isInterrupted() and interrupt() are instance methods of Thread.
The methods sleep() and yield() are static methods of Thread.
D is incorrect because synchronized is a keyword and the synchronized() construct is part of the Java language.
class X implements Runnable
{
public static void main(String args[])
{
/* Missing code? */
}
public void run() {}
}
Option C is suitable to start a thread.
Option C is correct. notify() - wakes up a single thread that is waiting on this object's monitor.