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.jav a file...

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

PLEASE HELP!!!


[CODE=java]// 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.prin tln("ID Number is: " + IDnumber);
}

public void showHours()
{
System.out.prin tln("Credit Hours: " + hours);
}

public void showPoints()
{
System.out.prin tln("Points Earned: " + points);
}

public double getGradePoint()
{
return (double)points / hours;
}

}



// ShowStudent.jav a
// client to test the Student class

class ShowStudent
{
public static void main (String args[])
{
student pupil = new student();


pupil.showIDnum ber();
pupil.showPoint s();
pupil.showHours ();
System.out.prin tln("The grade point average of the studnet created by constructor is "
+ pupil.getGradeP oint()+"\n\n");

Student s2 = new Student();
s2.setIDnumber( 12345);
s2.setPoints(66 );
s2.setHours(20) ;
s2.showIDnumber ();
s2.showPoints() ;
s2.showHours();
System.out.prin tln("The grade point average of another student is "
+ s2.getGradePoin t()+"\n");

}
}[/CODE]

[Ganon11]

In ShowStudent, you say:

[CODE=java]student pupil = new student();[/CODE]

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

[CODE=java]Student s2 = new Student();[/CODE]

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.jav a 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...


[CODE=java]// ShowStudent.jav a
// client to test the Student class

public class ShowStudent
{
public static void main (String args[])
{
Student pupil = new Student();


pupil.showIDnum ber();
pupil.showPoint s();
pupil.showHours ();
System.out.prin tln("The grade point average of the studnet created by constructor is "
+ pupil.getGradeP oint()+"\n\n");

Student s2 = new Student();
s2.setIDnumber( 12345);
s2.setPoints(66 );
s2.setHours(20) ;
s2.showIDnumber ();
s2.showPoints() ;
s2.showHours();
System.out.prin tln("The grade point average of another student is "
+ s2.getGradePoin t()+"\n");

}
}[/CODE]

[Seral1969]

I have set comments to the problem areas...

[CODE=java]// ShowStudent.jav a
// 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.showIDnum ber();
pupil.showPoint s();
pupil.showHours ();
System.out.prin tln("The grade point average of the studnet created by constructor is "
+ pupil.getGradeP oint()+"\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.prin tln("The grade point average of another student is "
+ s2.getGradePoin t()+"\n");

}
}[/CODE]

[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.jav a 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.jav a
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.NoCla ssDefFoundError : Student
Caused by: java.lang.Class NotFoundExcepti on: Student
at java.net.URLCla ssLoader$1.run( Unknown Source)
at java.security.A ccessController .doPrivileged(N ative Method)
at java.net.URLCla ssLoader.findCl ass(Unknown Source)
at java.lang.Class Loader.loadClas s(Unknown Source)
at sun.misc.Launch er$AppClassLoad er.loadClass(Un known Source)
at java.lang.Class Loader.loadClas s(Unknown Source)
at java.lang.Class Loader.loadClas sInternal(Unkno wn Source)

C:\Error>javac ShowStudent.jav a
ShowStudent.jav a:8: cannot find symbol
symbol : class Student
location: class ShowStudent
Student pupil = new Student();// 2 cannot resolve sybmol... points to 'S' in Student
^
ShowStudent.jav a:8: cannot find symbol
symbol : class Student
location: class ShowStudent
Student pupil = new Student();// 2 cannot resolve sybmol... points to 'S' in Student
^
ShowStudent.jav a:17: cannot find symbol
symbol : class Student
location: class ShowStudent
Student s2 = new Student();// 2 cannot resolve sybmol points to 'S in Student
^
ShowStudent.jav a: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.NoCla ssDefFoundError : ShowStudent
Caused by: java.lang.Class NotFoundExcepti on: ShowStudent
at java.net.URLCla ssLoader$1.run( Unknown Source)
at java.security.A ccessController .doPrivileged(N ative Method)
at java.net.URLCla ssLoader.findCl ass(Unknown Source)
at java.lang.Class Loader.loadClas s(Unknown Source)
at sun.misc.Launch er$AppClassLoad er.loadClass(Un known Source)
at java.lang.Class Loader.loadClas s(Unknown Source)
at java.lang.Class Loader.loadClas sInternal(Unkno wn 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.jav a file...

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

PLEASE HELP!!!


[CODE=java]// 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.prin tln("ID Number is: " + IDnumber);
}

public void showHours()
{
System.out.prin tln("Credit Hours: " + hours);
}

public void showPoints()
{
System.out.prin tln("Points Earned: " + points);
}

public double getGradePoint()
{
return (double)points / hours;
}

}



// ShowStudent.jav a
// client to test the Student class

class ShowStudent
{
public static void main (String args[])
{
student pupil = new student();


pupil.showIDnum ber();
pupil.showPoint s();
pupil.showHours ();
System.out.prin tln("The grade point average of the studnet created by constructor is "
+ pupil.getGradeP oint()+"\n\n");

Student s2 = new Student();
s2.setIDnumber( 12345);
s2.setPoints(66 );
s2.setHours(20) ;
s2.showIDnumber ();
s2.showPoints() ;
s2.showHours();
System.out.prin tln("The grade point average of another student is "
+ s2.getGradePoin t()+"\n");

}
}[/CODE]

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 "ShowStuden t" 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.jav a 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?