Cannot resolve symbol?

[Seral1969]

Hi, I'm new to Java...

I've been trying to get one of my professor's examples to work...

He says that the code is fine, but I keep getting 4 "cannot resolve symbol" errors when I try to compile the ShowStudent.java file...

The code for the Student class and ShowStudent program are listed below...

PLEASE HELP!!!

// Student.java
// creates a class to store info about a student
 
class Student
{
    // the private data members
    private int IDnumber;
    private int hours;
    private int points;
 
    // constructor added in last part of project
    Student()
    {
        IDnumber = 77375;
        points = 12;
        hours = 3;
    }
    // end of constructor
 
    // the public get and set methods
    public void setIDnumber(int number)
    {
        IDnumber = number;
    }
 
 
    public int getPoints()
    {
        return points;
    }
 
    // methods to display the fields
    public void showIDnumber()
    {
        System.out.println("ID Number is: " + IDnumber);
    }
 
    public void showHours()
    {
        System.out.println("Credit Hours: " + hours);
    }
 
    public void showPoints()
    {
        System.out.println("Points Earned: " + points);
    }
 
    public double getGradePoint()
    {
        return (double)points / hours;
    }
 
}
 
 
 
// ShowStudent.java
// client to test the Student class
 
class ShowStudent
{
    public static void main (String args[])
    {
        student pupil = new student();
 
 
        pupil.showIDnumber();
        pupil.showPoints();
        pupil.showHours();
        System.out.println("The grade point average of the studnet created by constructor is "
            + pupil.getGradePoint()+"\n\n");
 
        Student s2 = new Student();
        s2.setIDnumber(12345);
        s2.setPoints(66);
        s2.setHours(20);
        s2.showIDnumber();
        s2.showPoints();
        s2.showHours();
        System.out.println("The grade point average of another student is "
            + s2.getGradePoint()+"\n");
 
    }
}

[Ganon11]

In ShowStudent, you say:

student pupil = new student();

but the Student class is spelled with a capital S, like you used for s2:

Student s2 = new Student();

The compiler is looking for a separate class named student, which doesn't exist.

[Seral1969]

I changed the the S to uppercase, but I still get the same errors...

[Ganon11]

Can you copy/paste the exact errors? Put them between [code] tags so they are easier to read, please.

[Seral1969]

Here is the uptated ShowStudent.java file...

There are no changes to the Student.java file...

I have a screenshot of the error, but don't know how to attach it...

// ShowStudent.java
// client to test the Student class
 
public class ShowStudent
{
    public static void main (String args[])
    {
        Student pupil = new Student();
 
 
        pupil.showIDnumber();
        pupil.showPoints();
        pupil.showHours();
        System.out.println("The grade point average of the studnet created by constructor is "
            + pupil.getGradePoint()+"\n\n");
 
        Student s2 = new Student();
        s2.setIDnumber(12345);
        s2.setPoints(66);
        s2.setHours(20);
        s2.showIDnumber();
        s2.showPoints();
        s2.showHours();
        System.out.println("The grade point average of another student is "
            + s2.getGradePoint()+"\n");
 
    }
}

[Seral1969]

I have set comments to the problem areas...

// ShowStudent.java
// client to test the Student class
 
public class ShowStudent
{
    public static void main (String args[])
    {
        Student pupil = new Student();// 2 cannot resolve sybmol... points to 'S' in Student 
 
 
        pupil.showIDnumber();
        pupil.showPoints();
        pupil.showHours();
        System.out.println("The grade point average of the studnet created by constructor is "
            + pupil.getGradePoint()+"\n\n");
 
        Student s2 = new Student();// 2 cannot resolve sybmol points to 'S in Student
        s2.setIDnumber(12345);
        s2.setPoints(66);
        s2.setHours(20);
        s2.showIDnumber();
        s2.showPoints();
        s2.showHours();
        System.out.println("The grade point average of another student is "
            + s2.getGradePoint()+"\n");
 
    }
}

[Ganon11]

Now we're getting somewhere.

It looks like ShowStudent can't find the Student class - are they in the same folder?

If you can't get it to work, try copying/pasting the main into the Student class - that way, you're only working with one file, and there shouldn't be any unresolved errors.

[Seral1969]

Yes...

Both are in C:\Error...

[Seral1969]

The exercise says that I have to use two files...

I've even set the Student class to public...

No dice...

[Ganon11]

Try compiling Student.java first? Other than that, I don't know how to help you.

[Seral1969]

I've been compiling the Student.java file first...

I'll try compile ShowStudent.java first...

Thanks anyway...

[Seral1969]

Here's what happens when I compile the files...



02/17/2008 01:13 AM <DIR> .
02/17/2008 01:13 AM <DIR> ..
02/17/2008 01:13 AM 754 ShowStudent.java
02/16/2008 06:20 PM 885 Student.java
2 File(s) 1,639 bytes
3 Dir(s) 109,830,705,152 bytes free

C:\Error>javac Student.java

C:\Error>java Student
Exception in thread "main" java.lang.NoClassDefFoundError: Student
Caused by: java.lang.ClassNotFoundException: Student
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)

C:\Error>javac ShowStudent.java
ShowStudent.java:8: cannot find symbol
symbol : class Student
location: class ShowStudent
Student pupil = new Student();// 2 cannot resolve sybmol... points to 'S' in Student
^
ShowStudent.java:8: cannot find symbol
symbol : class Student
location: class ShowStudent
Student pupil = new Student();// 2 cannot resolve sybmol... points to 'S' in Student
^
ShowStudent.java:17: cannot find symbol
symbol : class Student
location: class ShowStudent
Student s2 = new Student();// 2 cannot resolve sybmol points to 'S in Student
^
ShowStudent.java:17: cannot find symbol
symbol : class Student
location: class ShowStudent
Student s2 = new Student();// 2 cannot resolve sybmol points to 'S in Student
^
4 errors

C:\Error>java ShowStudent
Exception in thread "main" java.lang.NoClassDefFoundError: ShowStudent
Caused by: java.lang.ClassNotFoundException: ShowStudent
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)

C:\Error>

[Laharl]

Looks to me like this folder isn't in your classpath.

[gaya3]

Hi, I'm new to Java...

I've been trying to get one of my professor's examples to work...

He says that the code is fine, but I keep getting 4 "cannot resolve symbol" errors when I try to compile the ShowStudent.java file...

The code for the Student class and ShowStudent program are listed below...

PLEASE HELP!!!

// Student.java
// creates a class to store info about a student
 
class Student
{
    // the private data members
    private int IDnumber;
    private int hours;
    private int points;
 
    // constructor added in last part of project
    Student()
    {
        IDnumber = 77375;
        points = 12;
        hours = 3;
    }
    // end of constructor
 
    // the public get and set methods
    public void setIDnumber(int number)
    {
        IDnumber = number;
    }
 
 
    public int getPoints()
    {
        return points;
    }
 
    // methods to display the fields
    public void showIDnumber()
    {
        System.out.println("ID Number is: " + IDnumber);
    }
 
    public void showHours()
    {
        System.out.println("Credit Hours: " + hours);
    }
 
    public void showPoints()
    {
        System.out.println("Points Earned: " + points);
    }
 
    public double getGradePoint()
    {
        return (double)points / hours;
    }
 
}
 
 
 
// ShowStudent.java
// client to test the Student class
 
class ShowStudent
{
    public static void main (String args[])
    {
        student pupil = new student();
 
 
        pupil.showIDnumber();
        pupil.showPoints();
        pupil.showHours();
        System.out.println("The grade point average of the studnet created by constructor is "
            + pupil.getGradePoint()+"\n\n");
 
        Student s2 = new Student();
        s2.setIDnumber(12345);
        s2.setPoints(66);
        s2.setHours(20);
        s2.showIDnumber();
        s2.showPoints();
        s2.showHours();
        System.out.println("The grade point average of another student is "
            + s2.getGradePoint()+"\n");
 
    }
}

Hi,
What i have observed is in"Student" file u dont have setter method for "Points" & "Hours".. but u were trying to set those variable at "ShowStudent" class..
Even this causes "cannot resolve" problem

-Hamsa

[sukatoa]

Hi, I'm new to Java...

I've been trying to get one of my professor's examples to work...

He says that the code is fine, but I keep getting 4 "cannot resolve symbol" errors when I try to compile the ShowStudent.java file...

The code for the Student class and ShowStudent program are listed below...

PLEASE HELP!!!

Are you sure of your code?

Maybe you forgot this,

at line 62, student must be Student
No such method as setPoints() in Student class
No such method as setHour() in Student class

make the class where the main method is to public...

tell us the result?

[JosAH]

This is a simple classpath problem. The javac compiler and the java virtual machine
don't know where to look for the class file Student after it started running the
other class. Simply add the classpath variable to them like this:

javac -cp . *.java 
...
java -cp . ShowStudent
 

The first line compiles both java files and sets the classpath to the current
directory (it reads: minus-c-p-space-dot). The last line runs your class given the
same classpath value.

kind regards,

Jos