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What happens to child thread when you delete main thread during run-time?
In Java, if the main thread somehow exits then all other threads will stop executing. This generally does not happen, as the main thread will wait for all child threads to terminate before the main thread itself finishes. Interrupting this process is hard to do short of an un-handled exception or a call to System.exit. If the child thread is also a daemon thread, then the child thread will continue to execute. If the child thread is a normal thread then, the moment System.exit is called, the child thread also terminates If you call the join() method from the child thread, then the main thread will wait until the child is over before executing the System.exit
Can the run method be called directly to start a thread?
No. If you want to start a new thread of execution, you need to call the start() method of the thread. Also, the run() is like any other java method and you can invoke it directly but if you do so, it would be called as part of the current programs thread and not as a new thread. When the start() method is invoked, the JVM creates a new thread and automatically calls the run() method and that is why a new thread gets started and not by calling run() directly.
Can you use two or more run methods for a single thread in same method?
No. Each thread can have only one run method. You can overload the run method because it is just another java method but only the default run method with void return type will get called when you start the thread
How do you call repaint using thread in java applet?
You call the repaint method the same way you'd call any other method from a thread. final Applet appletToRepaint; new Thread() { public void run() { appletToRepaint.repaint(); } }.start();
How do you terminate a thread which is continuously executing?
A thread that is continuously executing has an infinite loop. To terminate that thread you must break that loop by providing a suitable terminating condition. If the thread is a "worker" thread, the main thread should signal all worker threads to terminate when the main thread terminates. The main thread should remain active until all worker threads have successfully terminated.
What happens to child thread when you delete main thread during run-time?
In Java, if the main thread somehow exits then all other threads will stop executing. This generally does not happen, as the main thread will wait for all child threads to terminate before the main thread itself finishes. Interrupting this process is hard to do short of an un-handled exception or a call to System.exit. If the child thread is also a daemon thread, then the child thread will continue to execute. If the child thread is a normal thread then, the moment System.exit is called, the child thread also terminates If you call the join() method from the child thread, then the main thread will wait until the child is over before executing the System.exit
Can the run method be called directly to start a thread?
No. If you want to start a new thread of execution, you need to call the start() method of the thread. Also, the run() is like any other java method and you can invoke it directly but if you do so, it would be called as part of the current programs thread and not as a new thread. When the start() method is invoked, the JVM creates a new thread and automatically calls the run() method and that is why a new thread gets started and not by calling run() directly.
Can you use two or more run methods for a single thread in same method?
No. Each thread can have only one run method. You can overload the run method because it is just another java method but only the default run method with void return type will get called when you start the thread
How do you call repaint using thread in java applet?
You call the repaint method the same way you'd call any other method from a thread. final Applet appletToRepaint; new Thread() { public void run() { appletToRepaint.repaint(); } }.start();
How start method call the run method?
I think you're referring to the Thread class, and how calling Thread.start() simply appears to call the Thread.run() method. What happens is that the start() method tells the Java Virtual Machine to actually create and run a new thread. If you manually call the run() method, then your Thread object will execute its code, but it will run like a normal method - that is to say it will not spawn a new thread in the JVM.
How do you suspend thread?
Once a thread begins executing its run() method, it continues execution until the run() method completes. If you're familiar with other thread models, you may know of a concept called thread suspension, where a thread is told to pause its execution. Later, the thread is resumed, which is to say that it is told to continue its execution. The Thread class contains suspend() and resume() methods, but they suffer from the same race condition problem as the stop() method, and they, too, are deprecated. It is possible for a thread to suspend its own execution for a specific period of time by calling the sleep() method. When a thread executes the sleep() method, it pauses for a given number of milliseconds, during which it is said to be asleep. When the pause time has elapsed, the thread wakes up and continues execution with the statements immediately following the sleep() method.
What is main thread in java program?
the main thread is the first thread that creates when the JVM starts executing your program. All subsequent threads that you may create in your program would be child threads to the main thread. It is important to note that if the main thread exits, all other threads that were spawned by it will also get killed.
How do you terminate a thread which is continuously executing?
A thread that is continuously executing has an infinite loop. To terminate that thread you must break that loop by providing a suitable terminating condition. If the thread is a "worker" thread, the main thread should signal all worker threads to terminate when the main thread terminates. The main thread should remain active until all worker threads have successfully terminated.
What do you mean by multithreaded program Explain the life cycle of a thread?
Thread exists in several states. A thread just created is in the born state. When the threads start method is called, it enters the runnable (ready) state. Then the system assigns a processor to the thread. A thread enters the dead state when its run method completes or terminates for any reason. When a sleep method is called in a running thread, that thread becomes ready after the designated sleep time expires. Even if a processor is available, sleeping thread can not use it. A running thread can enter a blocked state.
Which method to tapping the nut thread is better?
Auto.
How do you call start method into run method?
In Java a Thread object has two methods that the programmer needs to know: start and run.run is where we put the code that we want to execute when the Thread begins.The start method is what tells the Java Virtual Machine that it should create a new thread and tell it to execute its run method.While you can make a call to thread.run() in order to execute the code in the run method, this will not actually make a new thread in the JVM, but will execute just like any normal method call.
Which keyword when applied on a method indicates that only one thread should execute the method at a time?
synchronized
