Exception Handling in Java language

Exception Handling in Java language

In this tutorial, we will discuss the concept of Exception handling in Java language.

Exception handling is one of the important, most useful and powerfull mechanism to handle the runtime error in Java. We will discuss the five keywords for exception handling in Java.

What is an exception?

An exception is one of the abnormal conditions of an unwanted situation or unexpected events that occur during the execution of a program. An exception may lead to termination of the program if not handled properly.

When can an exception occur?

An exception can occur twice:

• Run time exception – it is called runtime exception
• Compile-time exception – it is called compile-time exception

Java exceptions are basically java objects.

Unlike errors, exceptions can be used to prevent the program from terminating automatically.

Exceptions can be handled using the try and catch blocks.

Error
An error is thrown by the java runtime system and indicates that some irrecoverable condition has occured during execution of the program.

Different between exceptions and errors

An exception can be handled as a user or programmer but  we can not handle the  Error by user or programmer

What type of exception occur?

Two type of exception occur

• Checked Exeption – Checked Exeption are checked compile time

• unchecked Exception – Unchecked Exception are not checked at compile time . They are checked runtime

Hierarchy of Java Exception classes

We can use five keywords in exception handling in Java

1. try block
2. catch block
3. finally block
4. throw
5. throws

Type of Exceptions in java