required: double [] found: no arguments

Question

Code:

 ArrayList  marks = new ArrayList();

 String output = \"Class average:\" + calculateAverage() + \"\\n\" + \"Maximum mark:\" +  
 calcu         


        

Answer 1

Look at this:

String output = "Class average:" + calculateAverage() + ...

What's that meant to be calculating the average of? You've got to provide the method with some data to average. The same is going to be true of calculateMaximum, calculateMinimum etc. Without any context, those methods can't do anything.

Where are your actual marks stored? Presumably you have some sort of variable storing the marks - so pass that. For example:

String output = "Class average:" + calculateAverage(actualMarks) + ...

... except obviously with the real variable, or whatever you're using to store the marks.