Re: Help with code...

Ravi <>
Thu, 29 Nov 2007 02:11:54 -0800 (PST)
== and != does reference comparison. If you want to do object
comparison, use equals() method.
This is corrected by Andrew in his code snippet.

As an example, consider the following code
String str1 = new String("String");
String str2 = new String("String");
String str3 = str2;

What does it print? Reason it out.


On Nov 29, 8:04 am, "Andrew Thompson" <u32984@uwe> wrote: wrote:

I'm trying to complete a homework assignment ...

A good group for Java beginners is

...And here is what I have so far:

That code was a pretty good description of your problem,
but the lines wrapped and had to be fixed before it would
compile and the error became clear to me.

To help avoid line-wrap in code, use the TWC

Here is the fixed code, with comments. Note that this is an
SSCCE that spans only 68 characters width. Hopefully
it should not line-wrap.

import javax.swing.JOptionPane;

/* - This program calculates the total
  of your monthly bills.
Input: Bill type and bill amount.
Output: Prints the total of your monthly bills. */
public class MonthlyBills
    public static void main(String args[])
        /** Description of bill. */
        String billType;
        /** String version of bill amount. */
        String stringAmount;
        /** Amount of the bill. */
        double billAmount;
        /** Accumulates sum of bills. */
        double sum = 0;

            // This input statement asks the user to
            // enter a bill type or the word none.
            billType = JOptionPane.showInputDialog(
                "Enter bill type or the word done to quit.");

            // String comparison needs to be done using .equals()
            // to check equality of the contents, as opposed to
            // the String objects
                // This input statement asks your user
                // to enter a bill amount.
                stringAmount = JOptionPane.showInputDialog(
                    "Enter amount of bill");

                // This statement converts the string version
                // of the amount to a double.
                billAmount = Double.parseDouble(stringAmount);

                //This totals up the amount of the bills
                sum += billAmount;


            // This statement displays the sum of monthly bills.
            System.out.println("Sum of monthly bills is $: " + sum);

            // This statement causes the program to exit.

    } // End of main() method.

} // End of MonthlyBills class.


Andrew Thompson

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