24 Questions
What is the primary purpose of exception handling in Java?
To ensure that the program doesn't crash unexpectedly due to runtime errors.
What is the keyword used to explicitly throw an exception in Java?
throw
What is the benefit of using multiple catch blocks in a try-catch statement in Java?
To handle different types of exceptions.
What is the purpose of the catch block in a try-catch statement in Java?
To handle exceptions and handle them gracefully.
What is the purpose of the finally block in a try-catch-finally statement in Java?
To specify code that always executes, regardless of whether an exception was thrown or not.
What is the advantage of using the getMessage() method in a catch block in Java?
To retrieve the error message associated with the exception.
What is the purpose of the finally block in a Java exception handling construct?
The purpose of the finally block is to execute cleanup code, such as closing resources, regardless of whether an exception is thrown or not.
What is the difference between checked and unchecked exceptions in Java?
Checked exceptions are explicitly checked by the compiler and require handling or declaration, whereas unchecked exceptions are related to programming errors and do not require explicit handling or declaration.
How can you create a custom exception in Java?
You can create a custom exception by extending the Exception class or its subclasses.
What is the purpose of multithreading in Java?
The purpose of multithreading is to allow the concurrent execution of multiple tasks simultaneously, improving the performance and responsiveness of a program.
What is the root of the exception hierarchy in Java?
The root of the exception hierarchy in Java is java.lang.Throwable.
What is the difference between a thread and a process in Java?
A thread is a lightweight process within a Java program, whereas a process is a separate, independent execution unit.
What is the main purpose of using synchronization mechanisms in a multithreaded environment?
To ensure that only one thread can access a critical section of code at a time, preventing data corruption.
What is the range of priority levels that can be assigned to threads in Java?
1 (lowest) to 10 (highest)
What is the primary purpose of using multithreading in applications?
To improve the efficiency and responsiveness of applications
What are the methods used by threads to communicate and coordinate their activities?
wait(), notify(), and notifyAll()
What are the two primary ways to create threads in Java?
Extending the Thread class and implementing the Runnable interface
What are the two ways to terminate a thread explicitly?
By calling the interrupt() method or when the run() method completes its execution
What method needs to be called to start a thread's execution in Java?
The start() method
What is the state of a thread when it is created but has not started executing yet?
NEW
What is the purpose of using thread pools in Java?
To efficiently manage and reuse threads, reducing the overhead of thread creation and destruction.
What is the benefit of using multithreading in Java applications?
It can greatly improve the performance of Java applications, especially in scenarios where tasks can be parallelized.
What is the advantage of implementing the Runnable interface instead of extending the Thread class?
It allows for better separation of concerns
What is the purpose of the run() method in a thread?
To define the code that the thread will execute
Test your understanding of exception handling in Java, a crucial mechanism for dealing with runtime errors. Learn how to use try, catch, finally, and throw keywords to ensure your program doesn't crash unexpectedly. Assess your knowledge of throwing exceptions and more.
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