Cannot find symbol in same package and directory

问题

I have two classes, Offering and Course. They are both in the same package and the same directory.

Offering.java:

package assignment02;

public class Offering implements Comparable<Offering> {
    private Course course;
    private int CRN;
    private int semester;

    public Offering(Course course, int CRN, int semester) {
        this.course = course;
        this.CRN = CRN;
        this.semester = semester;
    }

    public int getNumCredits() {
        return course.getNumCredits;
    }

    public int getCRN() {
        return CRN;
    }

    public int getSemester() {
        return semester;
    }

    public int compareTo(Offering other) {
        if(other == null) return - 1;
        return semester - other.semester;
    }
}

Course.java:

package assignment02;

public class Course {
    private String name;
    private String rubric;
    private String number;
    private int numCredits;

    public Course(String name, String rubric, String number, int numCredits) {
        this.name = name;
        this.rubric = rubric;
        this.number = number;
        this.numCredits = numCredits;
    }

    public String getName() {
        return name;
    }

    public String getRubric() {
        return rubric;
    }

    public String getNumber() {
        return number;
    }

    public int getNumCredits() {
        return numCredits;
    }
}

When I try to compile Offering, I get the errors:

D:\CS 140\assignment02>javac Offering.java
Offering.java:4: error: cannot find symbol
    private Course course;
            ^
   symbol:   class Course
   location: class Offering

and

Offering.java:8: error: cannot find symbol
    public Offering(Course course, int CRN, int semester) {
                    ^
   symbol:   class Course
   location: class OfferingOffering.java:8: error: cannot find symbol

I know that the error means the compiler is unable to do anything with 'Course,' but I don't really know why. I also know that it will end up being something incredibly obvious, but I just can't seem to figure it out. Any help would be really appreciated.

回答1:

Change directories to the parent directory of assignment02. You should then be able to use

javac assignment02\Course.java assignment02\Offering.java

javac assignment02\Course.java 
javac assignment02\Offering.java

or even

javac assignment02\*.java

The compiler is is looking for the Course class in the assignment02 package FROM your current directory (so when your in the assignment02 directory, it's effectively trying to look in assignment02/assignment02, which obviously isn't right)

While this will correct you current problem you will then get...

assignment02\Offering.java:15: cannot find symbol
symbol  : variable getNumCredits
location: class assignment02.Course
    return course.getNumCredits;
                 ^
1 error

which will need to correct

回答2:

You need to compile Course.java first—Offering.java depends on it because you referenced it. Also,

public int getNumCredits() {
    return course.getNumCredits;
}

should be

public int getNumCredits() {
    return course.getNumCredits();
}

来源：https://stackoverflow.com/questions/32598120/cannot-find-symbol-in-same-package-and-directory

标签

java

compilation

symbols