您可以从另一个类调用私有构造函数吗？

Question

So I am trying to write a method that writes a list of students put into a treemap, but my treemap is in my StudentViewcontroller. Am I able to call it from my into my write student method.

  Here is my WriteStudent method so far:
  Public void WriteStudent(PrintWriter pw) {
   try{
      for (Map.Entry<String, Student> s : studentMap.entrySet()){
      }
     }catch(FileNotFoundException e){
  }
  }

Here is my treemap for the studentviewcontroller:

  public class StudentViewController {
    //A tree map to store the students
    private TreeMap<String, Student> studentMap = new TreeMap<String, Student>();

Answer 1

If you had a private constructor then you couldn't invoke it directly from any other class. However, you don't have a private constructor. Your class has a field (with private access permissions) which is of type TreeMap<String,Student> and named studentMap . This is a private constructor.

private StudentViewController() {
  super();
}

Answer 2

您不能从另一个类调用私有构造函数，私有构造函数，方法和变量只能由其所有者类调用。