[ElCam]

My assignment is to create a student class that has fields for a student name, number, credits earned and quality points earned. I need mutators and accessors methods for the students name, students number and other fields that needs Initilizing. I believe I have done all those correctly in my class...but it's not compliling. My main program should return the gpa which is quality points divided by credits earned and outputs their name and their number of course.


Here is my code:


// This stimulates a student class.

public class Student1
{
private String name;
private String studnum;
private double qualpts;
private double earnedcreds;

}
public Student1 (String Name ,
String Studnam)
{
name = Name;
studnam = Studnam;
qualpts = 0.0;
earnedcreds = 0.0;
}


public double getgpa()
{
return qualpts/earnedcreds;
}



It is having problems @ public student1 (String Name, String ) The error I am getting is unexpected';'..?? A
And here is my main program that is calling my class.


Code:
import java.util.Scanner;

public class Schuler
{
public static void main(String[] args)
{
Student1 Student;
double credits;
double quality;
double gpa;
String name;
String studnum2;
double earndcreds;

Scanner Keyboard = new Scanner(System.in);

System.out.print("What is the Students name?");
name = Keyboard.nextLine();
System.out.print("What is the Students number?");
studnum2 = Keyboard.nextLine();
System.out.print("What are the quality points earned?");
earndcreds = Keyboard.nextDouble();
System.out.print(gpa);
Student = new Student1(Name,Studnam);
// Creates new Student # 2
System.out.print("What is the Students name?");
name = Keyboard.nextLine();
System.out.print("What is the Students number?");
studnum2 = Keyboard.nextLine();
System.out.print("What are the quality points earned?");
earndcreds = Keyboard.nextDouble();
System.out.println(gpa)
Student = new Student1(Name, Studnam);
// Creates Student # 3
System.out.print("What is the Students name?");
name = Keyboard.nextLine();
System.out.print("What is the Students number?");
studnum2 = Keyboard.nextLine();
System.out.print("What are the quality points earned?");
earndcreds = Keyboard.nextDouble();
System.out.println(gpa);
}



}

The error I am getting here is when I create my new student...Thank you for any help! I really appreciate it

[amuridi]

I'm "Guest_AlM", forgot to log in.

Just pointing you in the right direction, if your instructor wants you to set the accessor and mutator, I think he's expecting you to integrate that into your main program.

I've got issues of myself. My instructor wants me to do a LowBall game written in java, it's easy but it'll be easier if I know how the hell LowBall is played.

Good luck.

[japanir]

please post your code between code tags.
from glancing at your code, i noticed that you declare the variables:

String studnum2;
String name;

however, later in your code you use it as: "Studnum" which is not declared. and "Name" which also you didnt declare. (when you create the Student1 Objects):

Student = new Student1(Name,Studnam);

[ElCam]

japanir, on 15 February 2010 - 03:54 AM, said:

please post your code between code tags.
from glancing at your code, i noticed that you declare the variables:

String studnum2;
String name;

however, later in your code you use it as: "Studnum" which is not declared. and "Name" which also you didnt declare. (when you create the Student1 Objects):

Student = new Student1(Name,Studnam);

Thank you both for your ideas. But I still have to call from my student1 file to my schuler so aren't those variables the same in both? And also I still am having trouble compiling...is my syntax correct and is my methodology correct also?

[ElCam]

Okay my student class has compiled and I really appreciate the help. But my main program that calls from my student program isn't compiling as easily. My compiling error is @ student = new Student1(name, Studnum, qualpts,earnedcreds );. I don't know what else I am doing wrong?

import java.util.Scanner;

public class Schuler
{
public static void main(String[] args)
{
Student1 student;
double credits;
double gpa;
double quality;
String name;
String studnum2;
double earndcreds;

gpa = quality/earndcreds;

Scanner Keyboard = new Scanner(System.in);

System.out.print("What is the Students name?");
name = Keyboard.nextLine();
System.out.print("What is the Students number?");
studnum2 = Keyboard.nextLine();
System.out.print("What are the quality points earned?");
earndcreds = Keyboard.nextDouble();
System.out.print(gpa);
student = new Student1(name, Studnum, qualpts,earnedcreds );

// Creates new Student # 2
System.out.print("What is the Students name?");
name = Keyboard.nextLine();
System.out.print("What is the Students number?");
studnum2 = Keyboard.nextLine();
System.out.print("What are the quality points earned?");
earndcreds = Keyboard.nextDouble();
System.out.println(gpa)
student = new Student1(name, Studnum, qualpts,earnedcreds);

// Creates Student # 3
System.out.print("What is the Students name?");
name = Keyboard.nextLine();
System.out.print("What is the Students number?");
studnum2 = Keyboard.nextLine();
System.out.print("What are the quality points earned?");
earndcreds = Keyboard.nextDouble();
System.out.println(gpa);
}



}

I hope to get the hang of the code snippet things. And again, Thanks for your help and taking the time to look @ my code!

[n8wxs]

[ code] <- Paste Your Code between -> [ /code]


The blue angle brackets symbol above the edit window will insert the tags in the window at the cursor when you click on them.

This post has been edited by n8wxs: 15 February 2010 - 10:40 AM

[NoobKnight]

Its hard to diagnose your problems without compile errors or the latest code. But...

These are definitely wrong.

public static void main(String[] args)
{
Student1 Student;
double credits;
double quality;
double gpa;
[b]String name;[/b]
[b]String studnum2;[/b]
double earndcreds;

Scanner Keyboard = new Scanner(System.in);

...
Student = new Student1([b]Name,Studnam[/b]);  // should be (name, studnum2)

I also think the class statement is wrong...

[ElCam]

Ok here are my latest code and issues. Here are both my class and my main program. My class is compiling without any issues.

   public class Student1 
{
   private String name;
   private String Studnum;
   private double qualpts;
   private double earnedcreds;


   public Student1 (String startname ,
                    String startnum)
   {
     name = startname;
     Studnum = startnum;
     qualpts = 0.0; 
     earnedcreds = 0.0;
   } 

    public String getName()
    {
    return name;
    }
    public void setName(String name)
    {
     this.name = name;
    }

   public String getNum()
   {
    return Studnum;
   }

   public void setNum() 
   {
    this.Studnum = Studnum;
   }

    public double getgpa()
     {
         return qualpts/earnedcreds;
      }

}           

My main program that calls my class program.

 
import java.util.Scanner;                        

public class Schuler 
{
	public static void main(String[] args)
	{
	   Student1 student;  
	   double credits;
           double gpa;
	   double quality;
           String name;
           String studnum2;
           double earndcreds;

           gpa = quality/earndcreds;

           Scanner Keyboard = new Scanner(System.in);
	
           System.out.print("What is the Students name?");	
	   name = Keyboard.nextLine();
	   System.out.print("What is the Students number?");
	   studnum2  = Keyboard.nextLine();
           System.out.print("What are the quality points earned?");  
           earndcreds = Keyboard.nextDouble();
           System.out.print(gpa);
           student = new Student1(name, studnum2 );

           // Creates new Student # 2
           System.out.print("What is the Students name?");	
	   name = Keyboard.nextLine();
	   System.out.print("What is the Students number?");
	   studnum2  = Keyboard.nextLine();
           System.out.print("What are the quality points earned?");  
           earndcreds = Keyboard.nextDouble();
           System.out.println(gpa)
           student = new Student1(name, studnum2 );

           // Creates Student # 3
           System.out.print("What is the Students name?");	
	   name = Keyboard.nextLine();
	   System.out.print("What is the Students number?");
	   studnum2  = Keyboard.nextLine();
           System.out.print("What are the quality points earned?");  
           earndcreds = Keyboard.nextDouble();
           System.out.println(gpa);
        } 
 


}

import java.util.Scanner; //Author: Eliot Ostling

public class Schuler
{
public static void main(String[] args)
{
Student1 student;
double credits;
double gpa;
double quality;
String name;
String studnum2;
double earndcreds;

gpa = quality/earndcreds;

Scanner Keyboard = new Scanner(System.in);

System.out.print("What is the Students name?");
name = Keyboard.nextLine();
System.out.print("What is the Students number?");
studnum2 = Keyboard.nextLine();
System.out.print("What are the quality points earned?");
earndcreds = Keyboard.nextDouble();
System.out.print(gpa);
student = new Student1(name, studnum2 );

// Creates new Student # 2
System.out.print("What is the Students name?");
name = Keyboard.nextLine();
System.out.print("What is the Students number?");
studnum2 = Keyboard.nextLine();
System.out.print("What are the quality points earned?");
earndcreds = Keyboard.nextDouble();
System.out.println(gpa)
student = new Student1(name, studnum2 );

// Creates Student # 3
System.out.print("What is the Students name?");
name = Keyboard.nextLine();
System.out.print("What is the Students number?");
studnum2 = Keyboard.nextLine();
System.out.print("What are the quality points earned?");
earndcreds = Keyboard.nextDouble();
System.out.println(gpa);
}



}
[/code]



My last compiling error is @ line 36. And it says that there is unexpected ';' @ line 36 so I don't know how to proceed. Again thanks for looking @ my code and helping me out! You guys rock!!

[NoobKnight]

earndcreds = Keyboard.nextDouble();
System.out.println(gpa)                    // <--- Missing ;
student = new Student1(name, studnum2 );

[ElCam]

NoobKnight Thank you soo much! I really appreciate it!

Also, new problem.

import java.util.Scanner;                         //Author: Eliot Ostling

public class Schuler 
{
	public static void main(String[] args)
	{
	   Student1 student;  
	   double credits;
           double gpa;
	   double quality;
           String name;
           String studnum2;
           double earndcreds;

           gpa = quality/earndcreds;

           Scanner Keyboard = new Scanner(System.in);
	
           System.out.print("What is the Students name?");	
	   name = Keyboard.nextLine();
	   System.out.print("What is the Students number?");
	   studnum2  = Keyboard.nextLine();
           System.out.print("What are the quality points earned?");  
           earndcreds = Keyboard.nextDouble();
           System.out.print(gpa);
           student = new Student1(name, studnum2 );

           // Creates new Student # 2
           System.out.print("What is the Students name?");	
	   name = Keyboard.nextLine();
	   System.out.print("What is the Students number?");
	   studnum2  = Keyboard.nextLine();
           System.out.print("What are the quality points earned?");  
           earndcreds = Keyboard.nextDouble();
           System.out.println(gpa);
           student = new Student1(name, studnum2 );

           // Creates Student # 3
           System.out.print("What is the Students name?");	
	   name = Keyboard.nextLine();
	   System.out.print("What is the Students number?");
	   studnum2  = Keyboard.nextLine();
           System.out.print("What are the quality points earned?");  
           earndcreds = Keyboard.nextDouble();
           System.out.println(gpa);
        } 
 


}

     

Sorry for the last post..this is my error. Its on line 15 it says they weren't initilized? But I have them there as doubles? Is there something I am not seeing??

This post has been edited by ElCam: 15 February 2010 - 11:52 AM

[NoobKnight]

Its good practice to initialize all fields before you use them.

something like...

           Student1 student = null;  
           double credits = 0.0;
           double gpa = 0.0;
           double quality = 0.0;
           String name = null;
           String studnum2 = null;
           double earndcreds = 0.0;

This post has been edited by NoobKnight: 15 February 2010 - 12:10 PM

[ElCam]

I reworked my code but its still not compiling any ideas??

import java.util.Scanner;                         
public class Schuler 
{
	public static void main(String[] args)
	{
	   Student1 student;  
	   double credits;
           double gpa;
	   double quality;
           String name;
           String studnum2;
           double earndcreds;

           Scanner Keyboard = new Scanner(System.in);
	   gpa = quality/credits

           System.out.print("What is the Students name?");	
	   name = Keyboard.nextLine();
	   System.out.print("What is the Students number?");
	   studnum2  = Keyboard.nextLine();
           System.out.print("What are the quality points earned?");  
           quality = Keyboard.nextDouble();
           System.out.print("How many credits have you earned?");
	   credits = Keyboard.nextDouble();
           System.out.print(name + studnum2 + gpa);
           student = new Student1(name, studnum2 );

           // Creates new Student # 2
           System.out.print("What is the Students name?");	
	   name = Keyboard.nextLine();
	   System.out.print("What is the Students number?");
	   studnum2  = Keyboard.nextLine();
           System.out.print("What are the quality points earned?");  
           quality = Keyboard.nextDouble();
	   System.out.print("How many credits have you earned?");
	   credits = Keyboard.nextDouble();
           System.out.println(name + studnum2 + gpa);
           student = new Student1(name, studnum2 );

           // Creates Student # 3
           System.out.print("What is the Students name?");	
	   name = Keyboard.nextLine();
	   System.out.print("What is the Students number?");
	   studnum2  = Keyboard.nextLine();
           System.out.print("What are the quality points earned?"); 
	   quality = Keyboard.nextDouble(); 
	   System.out.print("How many credits have you earned?");
	   credits = Keyboard.nextDouble();
           System.out.println(name + studnum2 + gpa);
        } 
 


}

Thanks everybody so far for your suggestions and ideas. It really has helped me a bunch!!

NoobKnight, on 15 February 2010 - 11:09 AM, said:

Its good practice to initialize all fields before you use them.

something like...

Student1 student;  
           double credits;
           double gpa;
           double quality;
           String name;
           String studnum2;
           double earndcreds;

Yeah. That's excatly what I had in my code...but for some odd reason it wasn't picking it up. So my code I reworked it but its still giving me the same issues? All the figures i get are suppose to be from the user so I don't understand where I am going wrong. Thanks a bunch!

[NoobKnight]

Crud, read the previous post I had. I accidentally hit send before I was ready and then edited it. But assign the doubles with 0.0 at least.

[japanir]

you perform the calculation to get the gpa when both quality and credits have no value.
do the calculation after getting the user input for these variables:

public static void main(String[] args) 
        { 
           Student1 student;   
           double credits; 
           double gpa; 
           double quality; 
           String name; 
           String studnum2; 
           double earndcreds; 
 
           Scanner Keyboard = new Scanner(System.in); 
           ///<<remove the gpa calculator from here
 
           System.out.print("What is the Students name?");       
           name = Keyboard.nextLine(); 
           System.out.print("What is the Students number?"); 
           studnum2  = Keyboard.nextLine(); 
           System.out.print("What are the quality points earned?");   
           quality = Keyboard.nextDouble(); 
           System.out.print("How many credits have you earned?"); 
           credits = Keyboard.nextDouble();
           //calculate gpa after getting quality and credits 
           gpa = quality/credits 
           System.out.print(name + studnum2 + gpa); 
           student = new Student1(name, studnum2 ); 

repeat this change with the rest of the Students you create.

**edited typo

This post has been edited by japanir: 15 February 2010 - 12:18 PM