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Questions and Answers
The balance of the account will always be 100 after all threads are finished.
The balance of the account will always be 100 after all threads are finished.
False (B)
The synchronized keyword is used to allow multiple threads to access a method simultaneously.
The synchronized keyword is used to allow multiple threads to access a method simultaneously.
False (B)
Thread synchronization is necessary to prevent race conditions.
Thread synchronization is necessary to prevent race conditions.
True (A)
The deposit method in the Account class is thread-safe by default.
The deposit method in the Account class is thread-safe by default.
The shutdown method is used to wait for all tasks to terminate.
The shutdown method is used to wait for all tasks to terminate.
The critical region in the program is the entire deposit method.
The critical region in the program is the entire deposit method.
Thread communication is necessary for thread creation.
Thread communication is necessary for thread creation.
The Account class is thread-safe if the deposit method is synchronized.
The Account class is thread-safe if the deposit method is synchronized.
If a thread in a fixed pool completes executing a task, it will be terminated.
If a thread in a fixed pool completes executing a task, it will be terminated.
A cached thread pool is efficient for a few long-running tasks.
A cached thread pool is efficient for a few long-running tasks.
The shutdown() method terminates all the existing tasks immediately.
The shutdown() method terminates all the existing tasks immediately.
Thread synchronization is necessary for independent threads.
Thread synchronization is necessary for independent threads.
A shared resource is always safe when accessed simultaneously by multiple threads.
A shared resource is always safe when accessed simultaneously by multiple threads.
The newFixedThreadPool(int) method creates a pool with a varying number of threads.
The newFixedThreadPool(int) method creates a pool with a varying number of threads.
If all the threads in a cached pool are idle, a new thread will be created for a new task.
If all the threads in a cached pool are idle, a new thread will be created for a new task.
It is recommended to use the Thread class for creating threads for multiple tasks.
It is recommended to use the Thread class for creating threads for multiple tasks.
In Java, multithreading can be implemented by invoking system-dependent procedures and functions.
In Java, multithreading can be implemented by invoking system-dependent procedures and functions.
A thread is responsible for allocating resources to multiple tasks.
A thread is responsible for allocating resources to multiple tasks.
Java threads have a fixed priority that cannot be changed.
Java threads have a fixed priority that cannot be changed.
A thread can execute multiple tasks simultaneously in a multiprocessor system.
A thread can execute multiple tasks simultaneously in a multiprocessor system.
Multithreading can make a program less responsive and interactive.
Multithreading can make a program less responsive and interactive.
In Java, each task is an instance of the Thread class.
In Java, each task is an instance of the Thread class.
A thread can only be used to execute a single task.
A thread can only be used to execute a single task.
Multithreading can lead to idle time in a program.
Multithreading can lead to idle time in a program.
Study Notes
Multithreading in Java
- Multithreading enables multiple tasks in a program to be executed concurrently, making a program more responsive and interactive.
- Multithreading in Java is supported through built-in language features, allowing for the creation and execution of multiple tasks within a program.
Thread Concepts
- A thread is the flow of execution of a task, providing a mechanism for running a task.
- Multiple threads can run concurrently, sharing a single CPU through time sharing, and the operating system is responsible for scheduling and allocating resources.
- Java provides exceptionally good support for creating and running threads, as well as locking resources to prevent conflicts.
Thread Pools
- A thread pool is a group of threads that can be reused to execute multiple tasks, improving efficiency.
- The
newFixedThreadPool(int)method creates a fixed number of threads in a pool, whilenewCachedThreadPool()creates a new thread if all threads in the pool are not idle and there are tasks waiting for execution. - A cached pool is efficient for many short tasks, and a thread in a cached pool will be terminated if it has not been used for 60 seconds.
Thread Synchronization
- Thread synchronization is necessary to coordinate the execution of dependent threads and prevent data corruption when accessing shared resources.
- In Java, the
synchronizedkeyword can be used to make a method thread-safe, allowing only one thread to access the method at a time. - An example of thread synchronization is making an
Accountclass thread-safe by adding thesynchronizedkeyword to thedepositmethod.
Executor Framework
- An
Executoris used to manage thread execution, and anExecutorServiceprovides a way to shut down the executor. - The
shutdown()method tells the executor to shut down, allowing existing tasks to finish but not accepting new tasks.
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Description
This quiz focuses on creating and managing threads in Java, including creating an account with an initial balance and submitting tasks to an executor. It also covers thread synchronization and shutdown.
