java - 怎么解决？错误 : symbol cannot find

Question

我无法编译文件，它在第 12 行和第 13 行给出错误。出现以下错误名称:

GradeBook.java: 12: error: can not find symbol courseName = name; (this line appears an arrow pointing to the "n" of "name.") Symbol: variable name location: class GradeBook

GradeBook.java: 13: error: can not find symbol instructorName = teacher; (this line appears an arrow pointing to the "p" for "teacher") symbol: variable Professor location: class GradeBook

public class GradeBook
{
private String courseName; // nome do curso para esse GradeBook
private String instructorName; // nome do professor para esse GradeBook


public GradeBook (String courseName, String instructorName)
{
    courseName = name; 
    instructorName = professor;
} 


public void setCourseName (String name)
{
    courseName = name; 
} 


public String getCourseName()
{
    return courseName;
} 


public void setInstructorName (String professor)
{
    instructorName = professor; 
} 


public String getInstructorName()
{
    return instructorName;
} 


public void displayMessage()
{
    System.out.printf("Welcome to the GradeBook for \n %s! \n",
        getCourseName() );
    System.out.printf("This course is presented by: \n %s \n",
        getInstructorName() );    
}
} 

Answer 1

在它的构造函数中看到它，您正在引用两个不存在的变量“name”和“teacher”。

public GradeBook (String courseName, String instructorName)
{
    courseName = name; // variable "name" is not declared anywhere
    instructorName = professor; // variable "teacher" was not declared.
} // fim do constructor

要修复此更改 courseName by name 和 teacher for instructorName 这是构造函数的参数。

看起来像这样:

public GradeBook (String courseName, String instructorName)
{
    this.courseName = courseName;
    this.instructorName = instructorName;
} // fim do construtor