我对Java和编程颇为陌生。我正在使用教科书“Java如何编程”。我正在解决一项运动(3.11 p。136)。在这个练习中,我试图获得一个有两个班级的应用程序来打印关于成绩册的信息。应该为该类的两个对象中的每一个输出两个字符串,其中包含以下信息:“gradeBook1课程名称为:CS101 Introduction to Java Programming,讲师是唐老鸭”。关于成绩簿2的一些其他信息。我应该使用get和set-methods,并使用构造函数。我现在工作了很多,而没有管理编译包含主要方法的“gradeBookTest类”。我收到以下错误信息:错误消息“找不到符号”
aGradeBookTest.java:8: cannot find symbol
symbol : variable gradebook1
location: class aGradeBookTest
System.out.printf("gradeBook1 course name is: emphasized text%s,\n instructor is %s\n", gradeBook1.getCourseName(), gradebook1.getInstructorName());
^
aGradeBookTest.java:9: cannot find symbol
symbol : method getInstructorname()
location: class aGradeBook
System.out.printf("gradebook2 course name is: %s\n, instructor name is: ", gradeBook2.getCourseName(), gradeBook2.getInstructorname());**
两个类的代码如下:
public class aGradeBook
{
private String courseName;
private String instructorName;
public aGradeBook(String name, String iName)
{
courseName = name;
instructorName = iName;
}
public void setCourseName(String name)
{
courseName = name;
}
public String getCourseName()
{
return courseName;
}
public void setInstructorName(String iName)
{
iName = instructorName;
}
public String getInstructorName()
{
return instructorName;
}
public void displayMessage()
{
System.out.printf ("Welcome to the gradebook for\n%s!\n", getCourseName());
}
}
和:
public class aGradeBookTest
{
public static void main(String[]args)
{
aGradeBook gradeBook1 = new aGradeBook("CS101 Introduction to Java Programming", "Donald Duck");
aGradeBook gradeBook2 = new aGradeBook("CS102 Data structures in Java", "Tom & Jerry");
System.out.printf("gradeBook1 course name is: %s,\n instructor is %s\n", gradeBook1.getCourseName(), gradebook1.getInstructorName());
System.out.printf("gradebook2 course name is: %s\n, instructor name is: ", gradeBook2.getCourseName(), gradeBook2.getInstructorname());
}
}
任何人都可以请帮我,我被困在这里?
'String [] args'应该是:'String [] args'。 – Kevin