Java exception handling

1. What is Java exception handling?
2. What are the 5 keywords in Java exception handling?
3. What is exception handling Java with example?
4. What is the best way to handle exceptions in Java?
5. Why exception handling is needed?
6. What are the benefits of exception handling?
7. Which is used to throw an exception?
8. Why throw is used in Java?
9. What are the four keywords for exception handling?
10. What are the types of exception?
11. What are the two types of exceptions in Java?
12. What is checked exception in Java?

What is Java exception handling?

Definition: An exception is an event, which occurs during the execution of a program, that disrupts the normal flow of the program's instructions. When an error occurs within a method, the method creates an object and hands it off to the runtime system. ... This block of code is called an exception handler.

What are the 5 keywords in Java exception handling?

Customized Exception Handling : Java exception handling is managed via five keywords: try, catch, throw, throws, and finally. Briefly, here is how they work. Program statements that you think can raise exceptions are contained within a try block. If an exception occurs within the try block, it is thrown.

What is exception handling Java with example?

Exception handling ensures that the flow of the program doesn't break when an exception occurs. For example, if a program has bunch of statements and an exception occurs mid way after executing certain statements then the statements after the exception will not execute and the program will terminate abruptly.

What is the best way to handle exceptions in Java?

9 Best Practices to Handle Exceptions in Java

1. Clean Up Resources in a Finally Block or Use a Try-With-Resource Statement. ...
2. Prefer Specific Exceptions. ...
3. Document the Exceptions You Specify. ...
4. Throw Exceptions With Descriptive Messages. ...
5. Catch the Most Specific Exception First. ...
6. Don't Catch Throwable. ...
7. Don't Ignore Exceptions. ...
8. Don't Log and Throw.

Why exception handling is needed?

Exception handling is important because it helps maintain the normal, desired flow of the program even when unexpected events occur. If exceptions are not handled, programs may crash or requests may fail. This can very frustrating for customers and if it happens repeatedly, you could lose those customers.

What are the benefits of exception handling?

Advantage 1: Separating Error-Handling Code from "Regular" Code. Exceptions provide the means to separate the details of what to do when something out of the ordinary happens from the main logic of a program. In traditional programming, error detection, reporting, and handling often lead to confusing spaghetti code.

Which is used to throw an exception?

All methods use the throw statement to throw an exception. The throw statement requires a single argument: a throwable object. Throwable objects are instances of any subclass of the Throwable class. Here's an example of a throw statement.

Why throw is used in Java?

The Java throws keyword is used to declare an exception. It gives an information to the programmer that there may occur an exception so it is better for the programmer to provide the exception handling code so that normal flow can be maintained.

What are the four keywords for exception handling?

C# exception handling is built upon four keywords: try, catch, finally, and throw.

What are the types of exception?

Below is the list of important built-in exceptions in Java.

• ArithmeticException. It is thrown when an exceptional condition has occurred in an arithmetic operation.
• ArrayIndexOutOfBoundsException. ...
• ClassNotFoundException. ...
• FileNotFoundException. ...
• IOException. ...
• InterruptedException. ...
• NoSuchFieldException. ...
• NoSuchMethodException.

What are the two types of exceptions in Java?

There are mainly two types of exceptions in Java as follows:

• Checked exception.
• Unchecked exception.

What is checked exception in Java?

A checked exception is a type of exception that must be either caught or declared in the method in which it is thrown. For example, the java.io.IOException is a checked exception. To understand what a checked exception is, consider the following code: Code section 6.9: Unhandled exception.