在相同的程序包和目录中找不到符号

Question

我有两个班，提供和课程。它们都在相同的程序包和相同的目录中。

Offer.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;
    }
}

当我尝试编译Offer时，出现以下错误：

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

和

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

我知道该错误意味着编译器无法使用“课程”执行任何操作，但是我真的不知道为什么。我也知道它最终会变得非常明显，但是我似乎无法弄清楚。任何帮助将非常感激。

Answer 1

将目录更改为的父目录assignment02。然后，您应该可以使用

javac assignment02\Course.java assignment02\Offering.java

要么

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

甚至

javac assignment02\*.java

编译器正在从当前目录中查找包中的Course类assignment02（因此，当您在assignment02目录中时，它实际上是在尝试查找assignment02/assignment02，这显然是不对的）

这样可以解决您当前的问题，然后您将获得…

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

这将需要纠正