java - 必需 : double [] found: no arguments

Question

代码:

 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;
 }

忽略字符串内的其他内容(最小值、最大值和范围)，但对于这一行，

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

我收到错误:

required: double []
found: no arguments

为什么会出现此错误？我应该更改什么？

Answer 1

您以这种方式调用calculateAverage 方法:calculateAverage()，不带任何参数。但该方法是这样声明的:

private double calculateAverage(double [] marks) 

因此，它需要一个 double[] 类型的参数，但您无需传递任何内容。