—What is Exception?

When an error occurred in a program during execution java will throw an error message which is technically call Exception(throw an error). As a result test case gets failed in Selenium and stopped to execute.

—Type of Exception in Java?

Throwable is a super class in Java. It has 2 sub class as Error & Exception.

—What is Exception Handling?

   -Handling any unexpected programming behavior during run time is called exception handling.

   -In java there is an exception handling mechanism which is applicable in Selenium. According to that,  if a known method gets  failed at runtime at certain condition, then we can  handle that exception using the mechanism is known as Try/Catch block.

Syntax try/catch: 
   try{ 
     //Block of code to try/test the error
      } 
      catch (Exception e){
    //Block of code to handle errors. 
     } 

Example:
public class ExceptionDemo {

	public static void main(String[] args) {
		try {
			int a[] = { 1, 2, 3, 4 };
			System.out.println(a[10]);
                } catch (ArrayIndexOutOfBoundsException e) {

System.out.println("Something went wrong in try block. I am in catch block. The Exception is below:");
e.printStackTrace();	
System.out.println("Message is:" + e.getMessage());
System.out.println("Cause is:" + e.getCause());	

}
		finally {
			System.out.println("This is finally block!");
		}

	}
}

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—Notes:

• Throwable is a super class. It has 2 sub class as Error & Exception.
• try :block of code to try error
• catch: block of code to handle error
• finally: block of code will execute after try-catch regardless of the result. So, finally code will execute always either try/catch block works or not.

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