Exception Handling in Java

       An Exception is an abnormal condition that arises in a code sequence at runtime. In simple way an exception is a runtime error.

Eg: If you use division operator i.e (a/b) in your code . if the value of b is zero then at run time the exception occurs as ‘divide by Zero’.

If you not handled the exception in your code the program will be error out . You can handle the exception using try-catch-finally method for safe completion of the program.

Syntax:
try { // block of code to monitor for errors } catch (ExceptionType1 exOb) { // exception handler for ExceptionType1 } catch (ExceptionType2 exOb) { // exception handler for ExceptionType2 } // ... finally { // block of code to be executed after try/catch block ends }

Example With out Exception Handling:
public class ExceptionEg { public static void main(String[] args) { int a=5,b=0; System.out.println("a/b is "+(a/b)); } }

Output:

Example with Exception Handling:
public class ExceptionEg { public static void main(String[] args) { int a=5,b=0; try{ System.out.println("a/b is "+(a/b)); } catch(Exception e) { System.out.println("Exception occured in try block"); } } }

Output:

Example of Finally block:
public class ExceptionEg { public static void main(String[] args) { int a=5,b=0; try{ System.out.println("a/b is "+(a/b)); } catch(Exception e) { System.out.println("Exception occured in try block"); } finally { System.out.println("Finally block will execute everytime i.e if the exceptions raise and if there is no exception" ); } } }  

Output If the exception raises:

Output if there is no Exception:
Changed the value of b to 2

Will discuss more on Exception handling in later parts