Error: cannot find symbol

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Hello, I asked a similar question awhile ago but my code has changed and i'm still struggling with this error. Basically i'm getting 3 'cannot find symbol' errors and I have no idea why. These are the exact error.

Student.java:13: error: cannot find symbol
		residency=argResidency;
		          ^
  symbol:   variable argResidency
  location: class Student
Student.java:48: error: cannot find symbol
	for(int i=0;i<courses.hours();i++){
	                     ^
  symbol:   method hours()
  location: variable courses of type ArrayList<Course>
Student.java:53: error: cannot find symbol
		creditHours=c.calculateCreditHours()+creditHours;
		             ^
  symbol:   method calculateCreditHours()
  location: variable c of type Course

and here's the code

import java.util.ArrayList;

public class Student{
	private String name;
	private String studentnumber;
	private String residency;

	private ArrayList<Course> courses = new ArrayList<Course>();

	public Student(String argName, String argStudentNumber, String arg){
		name=argName;
		studentnumber=argStudentNumber;
		residency=argResidency;
	}

	public void setName(String arg){
		name=arg;
	}

	public String getName(){
		return name;
	}

	public void setStudentNumber(String arg){
		studentnumber=arg;
	}

	public String getStudentNumber(){
		return studentnumber;
	}

	public void setResidency(String arg){
		residency=arg;
	}

	public String getResidency(){
		return residency;
	}

	public void addCourse(Course arg){
		courses.add(arg);

	}

	public double calculateCreditHours(){
	double creditHours=0;

	for(int i=0;i<courses.hours();i++){
		//grabs next pizza on list
		Course c=courses.get(i);

		//adds that pizza's price to running total
		creditHours=c.calculateCreditHours()+creditHours;

		//price=pizzas.get(i).calculatePrice()+price;

	}
	return creditHours;
}

}

and

public class Course{

	//attributes
	private String courseName;
	private String courseId;
	private String creditHours;

	public Course(String argcourseName, String argcourseId, String argcreditHours){
		courseName=argcourseName;
		courseId=argcourseId;
		creditHours=argcreditHours;

	}


	public void setCourseName(String arg){

		courseName=arg;
	}
	public void setCourseId(String arg){
		courseId=arg;
	}
	public void setcreditHours(String arg){

		creditHours=arg;
	}

	public String getCourseName(){
		return courseName;
	}

	public String getCourseId(){
		return courseId;
	}

	public String getCreditHours(){
		return creditHours;
	}



	}

I can also supply my unittest code if that's needed. Thanks in advance for any help.

What I have tried:

researching the error and trying to fix it according to that

Posted 16-Mar-20 9:21am

Member 14637431

Updated 16-Mar-20 10:44am

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phil.o · Answer 1 · 2020-03-16T09:37:00

Solution 1

There is a misnamed parameter, apparently.

Java

public Student(String argName, String argStudentNumber, String argResidency){
		name=argName;
		studentnumber=argStudentNumber;
		residency=argResidency;
	}

A logic error:

Java

for(int i=0;i<courses.size();i++){

And a miscalled method:

Java

creditHours=c.getCreditHours()+creditHours;

All these errors are rather trivial to solve. What path did you follow, starting from the error messages, to try and solve them?

Posted 16-Mar-20 9:37am

phil.o

Updated 16-Mar-20 10:11am

v3

Comments

Member 14637431 16-Mar-20 16:03pm

I'm still getting the error using courses.length and the error with c.getCreditHours() just started pointing to the + instead.

I can't believe I missed the argResidency one, I initially had it in but then I was changing a couple things before changing it back and must have just mistyped that one.

phil.o 16-Mar-20 16:09pm

The count function for an ArrayList in java is size().
https://www.w3schools.com/java/java_arraylist.asp
So replace length() by size() and you should get rid of that one.

The second one is because getCreditHours() returns a string instead of a double. Why don't you use proper numeric types for numeric values?
I leave to you the responsibility to tackle this one: either parse the result of the method, or change the method to return a proper double value. Second solution is cleaner, but may require you to adjust the code in some other places.

OriginalGriff · Answer 2 · 2020-03-16T10:45:00

Look at your code: when it says 'cannot find symbol' it is trying to tell you that nothing can be found with that name.

Student.java:13: error: cannot find symbol
		residency=argResidency;
                          ^

So the arrow is pointing at argResidency I would suspect you missed out a dot, but since arg is a string, and they don't have a Residency property, that's unlikely. So have a closer look:

Java

public Student(String argName, String argStudentNumber, String arg){
    name=argName;
    studentnumber=argStudentNumber;
    residency=argResidency;
}

Since you have a string called arg you almost certainly meant to call arg argResidency instead...

Follow that process for your other errors, and you should be able to start solving them for yourself.