这是我尝试过的Java程序。但是我找不到代码的错误

Question

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package exams;

public class ExamDetails {

    public static void main (String[] args){

        StudentResults aStudent = new StudentResults();


        String sName = aStudent.fullName("Bill Gates");
        System.out.println(sName);

    }

    class StudentResults{

    private String Full_Name;
    private String Exam_Name;
    private String Exam_Score;
    private String Exam_Grade;

    StudentResults(){
        Full_Name = "No Name Given";
        Exam_Name = "Unknown";
        Exam_Score = "No Score";
        Exam_Grade = "Unknown";
    }

    String fullName(String aName){

        Full_Name = aName;
        return Full_Name;

    }

}

}

Answer 1

StudentResults aStudent = new ExamDetails().new StudentResults(); 

在主要功能中执行此操作。

StudentResult是ExamDetails类的内部类，它不是static。

因此，要在静态main函数中使用非静态成员，需要引用包含该成员的类。

Answer 2

进行以下更改：

public class ExamDetails {

    static  StudentResults aStudent = new StudentResults();
    public static void main (String[] args){




        String sName = aStudent.fullName("Bill Gates");
        System.out.println(sName);

    }

    static class StudentResults{

    private String Full_Name;
    private String Exam_Name;
    private String Exam_Score;
    private String Exam_Grade;

    StudentResults(){
        Full_Name = "No Name Given";
        Exam_Name = "Unknown";
        Exam_Score = "No Score";
        Exam_Grade = "Unknown";
    }

    String fullName(String aName){

        Full_Name = aName;
        return Full_Name;

    }

}

}

或者第二个选项是在单独的文件中声明StudentResults

Answer 3

另一种选择：

package various;

public class  StudentResults{

    public static void main (String[] args){

        StudentResults aStudent = new StudentResults();

        String sName = aStudent.fullName("Bill Gates");
        System.out.println(sName);

    }

    private String Full_Name;
    private String Exam_Name;
    private String Exam_Score;
    private String Exam_Grade;

    StudentResults(){
        Full_Name = "No Name Given";
        Exam_Name = "Unknown";
        Exam_Score = "No Score";
        Exam_Grade = "Unknown";
    }

    String fullName(String aName){

        Full_Name = aName;
        return Full_Name;

    }
}