这是我试过的一个Java程序。但是我找不到我把代码弄错的地方

在main函数中执行此操作

StudentResult

是

ExamDetails

类的内部类，而不是

静态类

因此，要在静态主函数中使用非静态成员，需要引用包含该成员的类。
进行以下更改：

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

或者第二个选项是在单独的文件中声明
StudentResults
另一个选项：

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;

    }

}

}

那么问题出在哪里呢？尝试向StudentResults类添加static关键字。类似这样的内容：静态类StudentResults{…}
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;

    }

}

}

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;

    }
}