Java Thread Quiz

The start() method causes this thread to begin execution; the Java Virtual Machine calls the run method of this thread.

notify() - wakes up a single thread that is waiting on this object's monitor.

Calling wait() causes the current thread to cease execution and enter a waiting state until another thread invokes notify() or notifyAll(). While it doesn't 'terminate' the thread permanently, it directly stops its current execution flow. The other options either wake threads up or manage monitor locks.

The java.lang.Runnable interface defines exactly one method: public void run(). While option 176 has the correct signature, interface methods are implicitly public, and the implementing class must explicitly declare the method as public to match the interface's visibility requirements.

In Java, the thread's execution logic is defined by overriding the run() method of the Runnable interface or the Thread class. The start() method is called to begin execution, which then invokes run(), but the body itself resides in run().

The start() method is responsible for registering the thread with the thread scheduler and invoking the run() method. The run() method contains the code to be executed but calling it directly executes it in the current thread rather than a new one. There is no register() or construct() method in the Thread API for this purpose.

The notify() method is used to wake up a thread that is waiting on an object's monitor, but it does not cause the current thread to stop or terminate. In contrast, wait() blocks the thread, sleep() pauses it, and blocking I/O operations like InputStream access can also stop thread progress until data is available.

The wait(), notify(), and notifyAll() methods are defined in the java.lang.Object class. Since these methods deal with the monitor/lock status of a specific object, they are made available to all objects through the root Object class rather than being specific to Thread or Runnable.