Exceptions

Exception :
Exception is an abnormal condition.

Types of Exception :
1.Checked Exception
2.Unchecked Exception
3.Error

1) Checked Exception

The classes that extend Throwable class except RuntimeException and Error are known as checked exceptions e.g.IOException, SQLException etc. Checked exceptions are checked at compile-time.

2) Unchecked Exception

The classes that extend RuntimeException are known as unchecked exceptions e.g. ArithmeticException, NullPointerException, ArrayIndexOutOfBoundsException etc. Unchecked exceptions are not checked at compile-time rather they are checked at runtime.

3) Error

Error is irrecoverable e.g. OutOfMemoryError, VirtualMachineError, AssertionError etc.

Exception Handling Keywords

There are 5 keywords used in java exception handling.

try
catch
finally
throw
throws

Example :
Try {
// logic it may throw exception
}Catch(Exception e){
System.out.println(e.getMessage());
}