Thread: Public class help/error

Here is my code:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
package internetserviceproviderpart2;
import javax.swing.JOptionPane;
/**
 *
 * @author Home
 */
public class Main {
 
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        String inputString;
        char packageLetter;
        int hoursUsed;
        int additionalHours = 0;
        double totalFeeA = 0;
        double totalFeeB = 0;
        double savingsAB = 0;
        double savingsAC = 0;
        double savingsBC = 0;
 
        inputString = JOptionPane.showInputDialog("Enter the letter of the " +
                "package you purchased (either A, B, or C.)");
        inputString = inputString.toUpperCase();
        packageLetter = inputString.charAt(0);
 
        inputString = JOptionPane.showInputDialog("Enter the number of hours " +
                "you used.");
        hoursUsed = Integer.parseInt(inputString);
 
        if (packageLetter=='A' && hoursUsed>10)
        {
            additionalHours = hoursUsed - 10;
            totalFeeA = 9.95 + (additionalHours * 2.00);
            JOptionPane.showMessageDialog(null,"Your monthly bill is $" +
                    totalFeeA);
        }
        else if (packageLetter=='A' && hoursUsed<=10)
            JOptionPane.showMessageDialog(null,"Your monthly bill is $9.95.");
        else if (packageLetter=='B' && hoursUsed>20)
        {
            additionalHours = hoursUsed - 20;
            totalFeeB = 13.95 + (additionalHours * 1.00);
            JOptionPane.showMessageDialog(null,"Your monthly bill is $" +
                    totalFeeB);
        }
        else if (packageLetter=='B' && hoursUsed<=20)
            JOptionPane.showMessageDialog(null,"Your monthly bill is $13.95.");
        else if (packageLetter=='C')
            JOptionPane.showMessageDialog(null,"Your monthly bill is $19.95.");
        else
            JOptionPane.showMessageDialog(null,"Enter either A, B, or C.");
 
        if(totalFeeA>totalFeeB)
        {
            savingsAB = totalFeeA - totalFeeB;
            JOptionPane.showMessageDialog(null,"You would save $" + savingsAB +
                    "if you purchase Package B.");
        }
        else if (totalFeeA>19.95)
        {
            savingsAC = totalFeeA - 19.95;
            JOptionPane.showMessageDialog(null,"You would save $" + savingsAC +
                    "if you purchase Package C.");
        }
        else if (totalFeeB>19.95)
        {
            savingsBC = totalFeeB - 19.95;
            JOptionPane.showMessageDialog(null,"You would save $" + savingsBC +
                    "if you purchase Package C.");
        }
        else
 
        System.exit(0);
    }
 
}

Next to

public class Main {

there is a red circle with an exclamation point inside saying "class Main is public, should be declared in a file named Main.java"

I'm not too sure what that means.


Also, when I run the program...this pops out:

run:
java.lang.ExceptionInInitializerError
Caused by: java.lang.RuntimeException: Uncompilable source code - class Main is public, should be declared in a file named Main.java
        at internetserviceprovider.Main.<clinit>(Internet Service Provider.java:12)
Could not find the main class: internetserviceprovider.Main.  Program will exit.
Exception in thread "main" 
Exception in thread "main" Java Result: 1
BUILD SUCCESSFUL (total time: 2 seconds)

How do I fix it so I can run the program correctly?

Originally Posted by aussiemcgr

What is the name of your file?

Since you have included the statement:

public class Main

you are saying that the name of your file is Main.java. If not, the compiler will flip out at you. If the name is correct, then my next guess would be that the compiler doesn't like your use of the word Main as the name of your file.

My file's name is Internet Service Provider Part 2.java
I changed

public class Main

into

public class internetserviceproviderpart2 {

There is still a red squiggly line under it saying "internetserviceproviderpart2 = > "internetserviceproviderpart2" is not a known variable in the current context.<"

Originally Posted by Plural

My file's name is Internet Service Provider Part 2.java
I changed

public class Main

into

public class internetserviceproviderpart2 {

There is still a red squiggly line under it saying "internetserviceproviderpart2 = > "internetserviceproviderpart2" is not a known variable in the current context.<"

Internet Service Provider Part 2.java

If it's exactly as above, it might be better if you put it as

InternetServiceProviderPart2

Originally Posted by javapenguin

Internet Service Provider Part 2.java

If it's exactly as above, it might be better if you put it as

InternetServiceProviderPart2

I changed it just now but it is still the same problem.

Originally Posted by Plural

I changed it just now but it is still the same problem.

well, maybe it can't recognize your package, which happens to have the same name as the class.