Java Exception Handling

An exception is an object that interrupts the workflow of the program in Java.

The exception handling is a mechanism to handle the runtime errors so that the application regular workflow can be managed.

An exception handling is a mechanism to handle runtime errors such as ClassNotFoundException, SQLException, IOException, and etc.

There are 5 keywords used to handle the exception in Java:

• try
• catch
• finally
• throw
• throws

The Advantage of exception handling is help to maintain the normal workflow of the program.

Types of Exceptions in Java:

There are three types of exception handling. They are

• Check Exception
• Unchecked Exception
• Error

Check Exception

An checked exception is an exception that occurs at compilation-time. It is also called as Compile time exceptions.

Unchecked Exception

An unchecked exception is an exception that occurs at the time of execution. It is also called as Runtime Exceptions.

Error

Error is irrecoverable. Example: OutOfMemoryError, AssertionError and etc.

Java Exception Keywords

Example

 public class ExceptionHandling{
    public static void main(String args[]){  
        try{  
            int a=1/0;  
        }
        catch(ArithmeticException ae){
            System.out.println(ae);
        } 
        finally{
            System.out.println("Always execute");  
        }
  	}  
}   

Example

public class MultipleCatch{
    public static void main(String args[]){  
        try{  
            int a=1/0;  
        }
        catch(NullPointerException e){
            System.out.println(e);
        } 
        catch(ArithmeticException e){
            System.out.println(e);
        } 
        catch(Exception e){
            System.out.println(e);
        } 
        finally{
            System.out.println("Always execute");  
        }
  	}  
}