Can we call run method twice?

The run method is called twice. One call is by calling start() in the MyRunnable constructor; this is executed in the separate thread. That prints "MyRunnable". However, you also call run directly in main , which is executed in the main thread.

Can we call run method multiple times?

No. After starting a thread, it can never be started again. If you does so, an IllegalThreadStateException is thrown. In such case, thread will run once but for second time, it will throw exception.

Can we call run method twice in Java?

No, we cannot start Thread again, doing so will throw runtimeException java. lang. IllegalThreadStateException. > The reason is once run() method is executed by Thread, it goes into dead state.

Can we overload run method?

Yes , it possible to overload run ( ) method while using Threads in java .

Can we call run method instead of start?

No, you can not directly call run method to start a thread. You need to call start method to create a new thread. If you call run method directly , it won't create a new thread and it will be in same stack as main.

can we call start method twice on same thread

What happens if we call run method directly?

The run method is just another method. If you call it directly, then it will execute not in another thread, but in the current thread. If start isn't called, then the Thread created will never run. The main thread will finish and the Thread will be garbage collected.

How run method is called in thread?

The run() method of thread class is called if the thread was constructed using a separate Runnable object otherwise this method does nothing and returns. When the run() method calls, the code specified in the run() method is executed. You can call the run() method multiple times.

Why do we override the run method?

It is highly recommended to override run() method because it improves the performance of the system. If we don't override Thread class run() method in our defined thread then Thread class run() method will be executed and we will not get any output because Thread class run() is with an empty implementation.

How does run () method is invoked?

When a Thread object's run() method is invoked directly, the statements in the run() method are executed by the current thread rather than by the newly created thread.

What is the difference between thread Start () & thread run () method?

start method of thread class is implemented as when it is called a new Thread is created and code inside run() method is executed in that new Thread. While if run method is executed directly than no new Thread is created and code inside run() will execute on current Thread and no multi-threading will take place.

Can two threads run at the same time?

Within a process or program, we can run multiple threads concurrently to improve the performance. Threads, unlike heavyweight process, are lightweight and run inside a single process – they share the same address space, the resources allocated and the environment of that process.

Can we restart a thread?

Once a thread enters dead state it cannot be restarted.

Is run method is abstract in thread class?

run() is not abstract, as users need to override it, and why Thread.

Can Run method have parameters?

No you can't pass parameters to the run() method.

Can we override Run method in Java?

Can we override a start() method in Java? Yes, we can override the start() method of a Thread class in Java. We must call the super. start() method to create a new thread and need to call run() method in that newly created thread.

What is the return type of run () method?

The run method of Runnable has return type void and cannot return a value.

Can Run method return value in Java?

Return value : Return type of Runnable run() method is void , so it can not return any value. while Callable can return the Future object, which represents the life cycle of a task and provides methods to check if the task has been completed or canceled.

What are wait () notify () and notifyAll () methods?

The wait() method causes the current thread to wait until another thread invokes the notify() or notifyAll() methods for that object. The notify() method wakes up a single thread that is waiting on that object's monitor. The notifyAll() method wakes up all threads that are waiting on that object's monitor.

What happens if we override start method?

Whenever we override start() method then our start() method will be executed just like a normal method call and new thread wont be created. We can override start/run method of Thread class because it is not final. But it is not recommended to override start() method, otherwise it ruins multi-threading concept.

Can I implement my own start () method?

Answer: Yes, we can override start() method of thread in Java, the same way we override any other methods. for example, In below, custom thread class MyThread, both start() method and run() method have been overridden.

What is multiple threading?

Multithreading is a model of program execution that allows for multiple threads to be created within a process, executing independently but concurrently sharing process resources. Depending on the hardware, threads can run fully parallel if they are distributed to their own CPU core.

What is the difference between run () and start () methods in threads Mcq?

Explanation: run() method is used to define the code that constitutes the new thread, it contains the code to be executed. start() method is used to begin execution of the thread that is execution of run().

What happens if we call the run () method instead of start () method Mcq?

What if run method is called directly. If run() method is called directly instead of start() method in Java code, run() method will be treated as a normal overridden method of the thread class (or runnable interface). This run method will be executed with in the context of the current thread not in a new thread.

Is daemon a thread?

A Daemon thread is a background service thread which runs as a low priority thread and performs background operations like garbage collection. JVM exits if only daemon threads are remaining. The setDaemon() method of the Thread class is used to mark/set a particular thread as either a daemon thread or a user thread.