Computer Knowledge

Java Core Classes and Threads

1,473 Questions

Java core classes and threads form the foundation of object oriented programming and are crucial for IT officer and programming exams. This includes concepts like string mutability, collections, and multithreading. Solve these questions to test your practical coding and theoretical knowledge.

String and StringBuffer classesThread execution methodsJava collections frameworkCharacter streams input outputVariable serialization rules

Java Core Classes and Threads Questions

Multiple choice

What is the purpose of a throw statement?

  1. To raise an exception

  2. To catch an exception

  3. To handle an exception

  4. To prevent an exception
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A throw statement is used to raise an exception. This means that it signals that an error has occurred, and that the program should stop executing.

Multiple choice

What is the best way to handle errors that occur in a thread?

  1. Use a try-catch block

  2. Use a throw statement

  3. Use an assert statement

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The best way to handle errors that occur in a thread is to use a try-catch block.

Multiple choice

Which of the following is not a good practice for error handling in a thread?

  1. Use a try-catch block

  2. Use a throw statement

  3. Use an assert statement

  4. Ignore errors
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ignoring errors is not a good practice for error handling in a thread. It can lead to unexpected results and make it difficult to debug the program.