>> throwing Exception

Exception Handling in Java/Selenium Part 2:

throws Exception

Exception can be handled using try/catch blocks ( discussed in previous tutorial, click here ) or by throwing exception which is used in method definition. In this tutorial, we discuss about throwing exception.

Syntax:

public void methodName() throws Exception_type(or Exception_types separated by ",") {

executable code ;

}

Exception Types could be any from below list( below list has most common exception types) . You can use the Exception type based on the nature of your code ie what it is going to execute and what kind of exception might occur . You may use any one of the exceptions or combination of more than one exceptions , depending upon your code and how you want to handle if the exception occurs.

Most common Exceptions:

ArithmeticException

NullPointerException

ArrayIndexBoundException

IOException

FileNotFoundException

Exception

For example:

Let's write a code to open a txt file as below:

public static void main(java.lang.String[] args) throws IOException {

             

              File fl = new File("C:\\folder1\\folder2\\fileName.txt");                                 Desktop desktop = Desktop.getDesktop();

             desktop.open(fl);

}

OR

public static void main(java.lang.String[] args) throws IOException, Exception {

             

              File fl = new File("C:\\folder1\\folder2\\fileName.txt");                                 Desktop desktop = Desktop.getDesktop();

             desktop.open(fl);

}

OR

public static void main(java.lang.String[] args) throws Exception {

//Exception is higher level exception which handles IOException as well.         

              File fl = new File("C:\\folder1\\folder2\\fileName.txt");                                 Desktop desktop = Desktop.getDesktop();

             desktop.open(fl);

}