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Exception Handling Interview Questions


Here are a few Exception Handling Interview Questions for you!


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Some useful information that will help you brush up on Exception Handling Interview Questions

Exception Handling in Java- A trenchant Concept

The simplistic handling and the exception to reuse codes when developing a web application makes Java the most sought programming language by developers all around the world. This code language is used in generating a myriad of applications for systems as well as embedded devices such as laptops, mobile phones, tablets and much more.

Java as a field is sought to be a career-oriented platform with more companies asking for programmers who hold expertise in this field. This makes java and exception handling an important topic to garner for answering the questions related to it and exception handling in java interview questions tops the category.

Usually when any error comes in the program, it is not ease to understand. Exception handling makes the user familiar about the errors. As the message displayed by exception handling is manually designed user-friendly message. This renders the advantage to solve errors in less time. The concepts of exception handling are applied in the programming with the keywords try, catch, finally, throw and throw.  Here's an in-detail explanation of the concept.

  • What does an exception in java mean?

While many are adept with the term "java" itself and programming, many students still are obscure with the term "exception". So,what is exception in java and how does it aid programmers in developing exceptional web applications and so on?

  • What is meant by exception handling in java?

The concept of writing powerful and effective java code through the application of various guidelines set forth is known as exception handling program in java. This process aids developers process synchronous errors.  Explaining exception handling in java with examples is that of synchronizing the errors such as divisions by zero and out-of-range array indexes.

However, this system is not meant for handling asynchronous events that include keystrokes, mouse clicks and disk I/O completions. In short, an exception is an event that occurs usually during the execution of a program thereby disrupting the normal flow of program's information.

An exception can occur for a myriad of reasons such as when the user enters invalid data, when a file that needs to be opened is not found and when there is a loss of network connection in the middle of communications or if the JVM runs out of memory.

  • What are the types of exceptions?

There are two main types of exceptions in java, which includes several other subsets within it. This includes checked and unchecked exceptions.

Checked exception

The checked exception is defined as the class that extends the throwable class except that of runtime exception and error. Some of the exceptions include IO Exception, SQL Exception. This kind of checked exception in java is checked at compile-time.

Unchecked exception

It is defined as the class that extends the Runtime exceptions which includes Arithmetic Exception and Null Pointer Exception. In comparison to the former, an unchecked exception is checked at runtime rather than the compiled time.

Apart from these, there exists one more category called the error. These are completely irrevocable. The examples include Out of Memory Error, Virtual Machine Error, Assertion Error and much more.

  • What is a throw in Java?

The Java throw is a keyword that helps in the management of exceptions in compiled checked exceptions. The throw keyword in java is used to throw an exception from a method or in any block of the code. Though one can use this for both types of exceptions, this method is mainly used for handling a custom exception in java.

  • Throw and Throws in Java?

There is a difference between throw and throws in java. A Throw is used for explicitly throwing exceptions, a java throw is a clause used for declaring the exception. This works in a way similar to the try-catch block. On the other hand, throws keyword in the exception is used with method signature only.

This method is applied in both checked and unchecked exception in java. For creating custom exception, one needs to extend the java.language.exception class for management by exception. On the other hand, for creating a custom unchecked exception, the developer will have to extend the java.lang. Runtimeexception class. Such exceptions that are generated using the keyword throw is known as user defined exception in java.

  • Exceptions Hierarchy in Java

All these subtypes of java.lang.exception class together comprise of exception hierarchy in java that details each subclass of the throwable class when performing the process.

As any code can be developed using Java and as it is the most user-free platform, this programming language gains high in comparison to other languages such as C+ and C++. It is also noted as the best programming language for handling networked computers. Thus, having a knack of this is a must for upscaling career in the field of programming.

Some of the many Exception Handling Interview Questions listed below will help you get an idea about what questions gets asked in such jobs related to Software Engineering & Tech. Get through the Exception Handling Interview bar with our selected Exception Handling Interview Questions for all Exception Handling enthusiasts!

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