HELP PLEASE urgent: Creating a package, and class that prints all...

Question

please help, 5 duke dollars up for the best answer, or first answer that solves my problem!
Hello, I have created a package called molecule that contains classes named Water, Sugar, Carbon Dioxide, and SulfuricAcid, and a sub-package named molecule.atom. The atom sub-package contains classes named Carbon, Hydrogen, Oxygen, and Sulfur. Each class in the molecule package should re-define the toString() method to print the numbers and types of atoms that constitute the molecule. For example, molecule.Sugar.toString() should return the string:
"Sugar: 6 Carbon, 12 Hydrogen, 6 Oxygen".
So basically, I have created a folder in C:\molecule\ and a subfolder C:\molecule\atom\ . I have also created a class called ChemTest belonging to the default package. ChemTest.main() creates and prints instances of each molecule and atom, but does not contain any import statements. The problem is that the ChemTest.java file won't compile coming up with 16 errors!
Can someone explain to me what I am doing wrong?
here is one of the molecule classes, for example CarbonDioxide.java:
package molecule;
public class CarbonDioxide
     private String co2;
     public CarbonDioxide()
          co2 = "Carbon Dioxide: 1 Carbon, 2 Oxygen";
     public String toString()
          return co2;
and here is one of the atom classes, for example Carbon.java:
package molecule.atom;
public class Carbon
     private String c;
     public Carbon()
          c = "Carbon: symbol = C, num = 6, weight = 12.011";
     public String toString()
          return c;
now here is the ChemTest.java file that won't compile:
public class ChemTest
     public static void main(String[]args)
          molecule.Water water = new molecule.Water();
          molecule.Sugar sugar = new molecule.Sugar();
          molecule.CarbonDioxide carbonDioxide = new molecule.CarbonDioxide();
          molecule.SulfuricAcid sulfuricAcid = new molecule.SulfuricAcid();
          molecule.atom.Carbon carbon = new molecule.atom.Carbon();
          molecule.atom.Oxygen oxygen = new molecule.atom.Oxygen();
          molecule.atom.Hydrogen hydrogen = new molecule.atom.Hydrogen();
          molecule.atom.Sulfur sulfur = new molecule.atom.Sulfur();
          System.out.println(water.toString());
          System.out.println(sugar.toString());
          System.out.println(carbonDioxide.toString());
          System.out.println(sulfuricAcid.toString());
          System.out.println();
          System.out.println(carbon.toString());
          System.out.println(oxygen.toString());
          System.out.println(hydrogen.toString());
          System.out.println(sulfur.toString());
and finally, here are the errors:
C:\molecule\ChemTest.java:5: cannot resolve symbol
symbol : class Water
location: package molecule
          molecule.Water water = new molecule.Water();
^
C:\molecule\ChemTest.java:5: cannot resolve symbol
symbol : class Water
location: package molecule
          molecule.Water water = new molecule.Water();
^
C:\molecule\ChemTest.java:6: cannot resolve symbol
symbol : class Sugar
location: package molecule
          molecule.Sugar sugar = new molecule.Sugar();
^
C:\molecule\ChemTest.java:6: cannot resolve symbol
symbol : class Sugar
location: package molecule
          molecule.Sugar sugar = new molecule.Sugar();
^
C:\molecule\ChemTest.java:7: cannot resolve symbol
symbol : class CarbonDioxide
location: package molecule
          molecule.CarbonDioxide carbonDioxide = new molecule.CarbonDioxide();
^
C:\molecule\ChemTest.java:7: cannot resolve symbol
symbol : class CarbonDioxide
location: package molecule
          molecule.CarbonDioxide carbonDioxide = new molecule.CarbonDioxide();
^
C:\molecule\ChemTest.java:8: cannot resolve symbol
symbol : class SulfuricAcid
location: package molecule
          molecule.SulfuricAcid sulfuricAcid = new molecule.SulfuricAcid();
^
C:\molecule\ChemTest.java:8: cannot resolve symbol
symbol : class SulfuricAcid
location: package molecule
          molecule.SulfuricAcid sulfuricAcid = new molecule.SulfuricAcid();
^
C:\molecule\ChemTest.java:10: cannot resolve symbol
symbol : class Carbon
location: package atom
          molecule.atom.Carbon carbon = new molecule.atom.Carbon();
^
C:\molecule\ChemTest.java:10: cannot resolve symbol
symbol : class Carbon
location: package atom
          molecule.atom.Carbon carbon = new molecule.atom.Carbon();
^
C:\molecule\ChemTest.java:11: cannot resolve symbol
symbol : class Oxygen
location: package atom
          molecule.atom.Oxygen oxygen = new molecule.atom.Oxygen();
^
C:\molecule\ChemTest.java:11: cannot resolve symbol
symbol : class Oxygen
location: package atom
          molecule.atom.Oxygen oxygen = new molecule.atom.Oxygen();
^
C:\molecule\ChemTest.java:12: cannot resolve symbol
symbol : class Hydrogen
location: package atom
          molecule.atom.Hydrogen hydrogen = new molecule.atom.Hydrogen();
^
C:\molecule\ChemTest.java:12: cannot resolve symbol
symbol : class Hydrogen
location: package atom
          molecule.atom.Hydrogen hydrogen = new molecule.atom.Hydrogen();
^
C:\molecule\ChemTest.java:13: cannot resolve symbol
symbol : class Sulfur
location: package atom
          molecule.atom.Sulfur sulfur = new molecule.atom.Sulfur();
^
C:\molecule\ChemTest.java:13: cannot resolve symbol
symbol : class Sulfur
location: package atom
          molecule.atom.Sulfur sulfur = new molecule.atom.Sulfur();
^
16 errors
Please help!!!, thanks!

Answer 1

HI,
I tried your problem with the following directory structure:c:\java\ChemTest.java
c:\java\molecule\CarbonDioxide.java
c:\java\molecule\atom\Carbon.javaI set the dos-prompt to c:\java and ran the following commands:javac molecule\CarbonDioxide.java
javac molecule\atom\Carbon.java
javac -classpath . ChemTest.java- and it worked!
Sure, in ChemTest.java I deleted all the lines refering to classes that you didn't post...
I hope this helps you!
Anja