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Index › Programming Questions & Help › Syntax Questions › Check if a parameter has ben provided

nardove Full Member Offline Posts: 189 UK	Check if a parameter has ben provided Jul 3rd, 2009, 8:32am   Hi all, I have a class that takes 1 parameter, but I want to make that parameter optional, so if its been provided do something if not do something else, the parameter is a PImage how can I do that? Thanks rS

koogy God Member Offline Posts: 788

Re: Check if a parameter has ben provided Reply #1 - Jul 3rd, 2009, 8:47am   java doesn't do optional parameters the way php or c++ does but you can use polymorphism to emulate it Code: // this method takes no parameter and passes null to the 'real' method public void method() {  method(null); } // this method takes one parameter which can be null public void method(PImage parameter) {  if (parameter == null) {    // no parameter supplied  } else {    // we have parameter  } } methods have the same name and can take 0 or 1 parameters