Question

Code:

 ArrayList <Integer> marks = new ArrayList();

 String output = "Class average:" + calculateAverage() + "\n" + "Maximum mark:" +  
 calculateMaximum() + "\n" +"Minimum mark:" + calculateMinimum() + "\n" + "Range of 
 marks:" + range;

 analyzeTextArea.setText(output);

 private double calculateAverage(double [] marks) {
 double sum = 0;
 for (int i=0; i< marks.length; i++) {
 sum += marks[i];
 }
 return sum / marks.length;
 }

Disregard the other things inside the string (minimum, maximum, and range) but for this line,

 String output = "Class average:" + calculateAverage() + "\n" + "Maximum mark:" +  
 calculateMaximum() + "\n" +"Minimum mark:" + calculateMinimum() + "\n" + "Range of 
 marks:" + range;

I get an error:

required: double []
found: no arguments

Why do I get this error and what should I change?

Answer 1

You’re calling the method calculateAverage this way: calculateAverage(), without any argument. But the method is declared this way:

private double calculateAverage(double [] marks) 

It thus needs one argument of type double[], but you don’t pass anything.