Handle exception by Try, Catch and Finally statement in Apex in Salesforce.com

Try-Catch-Finally Statements Syntax:

try {

      //Perform some operation that might cause an exception.

} catch (exception e){ 

      //Handle generic exception here.

} catch (dmlexception de){ 

      //Handle dml exception here.

} finally { 

      //this block of code always execute and allows you to clean up your code.

}

Apex Code

try {
  // Perform some operation that might cause an exception.
    Merchandise__c m = new Merchandise__c();
    insert m;

    // This doesn't execute since insert causes an exception
    System.debug('Statement after insert.');

} catch (Exception e) {
    
   // Handle generic exception here.
   }catch(DmlException e) {
    System.debug('The following exception has occurred: ' + e.getMessage());
    
 } finally {
    // Perform some clean up.
}