How do you make a parameter optional in Java?

A method that contains optional parameters does not force to pass arguments at calling time. It means we call method without passing the arguments . The optional parameter contains a default value in function definition. If we do not pass optional argument value at calling time, the default value is used.

There are no optional parameters in Java. What you can do is overloading the functions and then passing default values.

The trick that enables a work around for declaring optional parameters for t-sql functions is checking the parameter with ISNULL() within the sql function definition and calling the function with NULL values where you want to use default value for the optional parameter .