Exception Handling

Exception class Hierarchy

Types of exceptions

• There are two types of exceptions in Java:
• Checked exceptions
• Unchecked exceptions

Checked exceptions

• Checked exceptions are checked at compile-time.
• The classes which directly inherit Throwable class except RuntimeException and Error are known as checked exceptions .
• If these exceptions are not handled/declared in the program, you will get compilation error.
• For example
• SQLException
• IOException
• ClassNotFoundException etc.

Unchecked Exceptions

• These exceptions are not checked at compile-time so compiler does not check whether the programmer has handled them or not but it’s the responsibility of the programmer to handle these exceptions and provide a safe exit.
• Runtime Exceptions are also known as Unchecked Exceptions.
• For example:
• ArithmeticException
• NullPointerException
• ArrayIndexOutOfBoundsException etc.