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Thread: problem with my class

  1. #1
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    Default problem with my class

    I have a question about my code I'm trying for the exercise.

    It says "Error, cannot load ValidatedInvoiceApp." What's wrong?

    package java;
    import java.text.NumberFormat;
    import java.util.Scanner;
     
    public class ValidatedInvoiceApp
    {
        public static void main(String[] args)
        {
            Scanner sc = new Scanner(System.in);
            String choice = "y";
     
     
            while (!choice.equalsIgnoreCase("n"))
            {
     
                boolean isValid = false;
                while(isValid == false){
     
                // get the input from the user
                System.out.print("Enter customer type (r/c): ");
                 String customerType = "r, c";
                 if (sc.hasNext("r,c"))
                {
     
                    isValid = true;
                }else
                    {
                        System.out.println("error! Invalid number.Try again.");
                    }
                    sc.nextLine();//discard anything on the line
     
     
                System.out.print("Enter subtotal:   ");
                double subtotal = sc.nextDouble();
     
     
     
     
     
                // get the discount percent
                double discountPercent = 0;
                if (customerType.equalsIgnoreCase("R"))
                {
                    if (subtotal < 100) {
                        discountPercent = 0;
                    }
                    else if (subtotal >= 100 && subtotal < 250) {
                        discountPercent = .1;
                    }
                    else if (subtotal >= 250) {
                        discountPercent = .2;
                    }
                }
                else if (customerType.equalsIgnoreCase("C"))
                {
                    if (subtotal < 250) {
                        discountPercent = .2;
                    }
                    else {
                        discountPercent = .3;
                    }
                }
                else {
                    discountPercent = .1;
                }
     
                // calculate the discount amount and total
                double discountAmount = subtotal * discountPercent;
                double total = subtotal - discountAmount;
     
                // format and display the results
                NumberFormat currency = NumberFormat.getCurrencyInstance();
                NumberFormat percent = NumberFormat.getPercentInstance();
                System.out.println(
                    "Discount percent: " + percent.format(discountPercent) + "\n" +
                    "Discount amount:  " + currency.format(discountAmount) + "\n" +
                    "Total:            " + currency.format(total) + "\n");
     
                // see if the user wants to continue
                System.out.print("Continue? (y/n): ");
                choice = sc.next();
                System.out.println();
     
                    }
                }
     
     
           }
     
    }


  2. #2
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    Default Re: problem with my class

    Now it's giving me errors I don't understand.

    java.lang.SecurityException: Prohibited package name: java
    at java.lang.ClassLoader.preDefineClass(ClassLoader.j ava:649)
    at java.lang.ClassLoader.defineClass(ClassLoader.java :785)
    at java.security.SecureClassLoader.defineClass(Secure ClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader .java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader. java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java: 361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java: 355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.j ava:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:4 23)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:3 56)
    at sun.launcher.LauncherHelper.checkAndLoadMain(Launc herHelper.java:480)
    Exception in thread "main" Java Result: 1




    package java;
    import java.text.NumberFormat;
    import java.util.Scanner;
     
    public class ValidatedInvoiceApp
    {
        public static void main(String[] args)
        {
            Scanner sc = new Scanner(System.in);
            String choice = "y";
     
     
            while (!choice.equalsIgnoreCase("n"))
            {
                String customerType = "r, c";
                System.out.print("Enter customer type (r/c): ");
     
     
                 if (sc.hasNext(customerType)) 
                 {
                     customerType = sc.next();
                 }else
                 {
                     sc.nextLine();//discard anything on the line
                     System.out.println("error! Invalid number.Try again.");
                     continue;
                 }
     
     
                  System.out.print("Enter subtotal:   ");
                    double subtotal = sc.nextDouble();
     
     
     
     
     
     
                // get the discount percent
                double discountPercent = 0;
                if (customerType.equalsIgnoreCase("R"))
                {
                    if (subtotal < 100) {
                        discountPercent = 0;
                    }
                    else if (subtotal >= 100 && subtotal < 250) {
                        discountPercent = .1;
                    }
                    else if (subtotal >= 250) {
                        discountPercent = .2;
                    }
                }
                else if (customerType.equalsIgnoreCase("C"))
                {
                    if (subtotal < 250) {
                        discountPercent = .2;
                    }
                    else {
                        discountPercent = .3;
                    }
                }
                else {
                    discountPercent = .1;
                }
     
                // calculate the discount amount and total
                double discountAmount = subtotal * discountPercent;
                double total = subtotal - discountAmount;
     
                // format and display the results
                NumberFormat currency = NumberFormat.getCurrencyInstance();
                NumberFormat percent = NumberFormat.getPercentInstance();
                System.out.println(
                    "Discount percent: " + percent.format(discountPercent) + "\n" +
                    "Discount amount:  " + currency.format(discountAmount) + "\n" +
                    "Total:            " + currency.format(total) + "\n");
     
                // see if the user wants to continue
                System.out.print("Continue? (y/n): ");
                choice = sc.next();
                System.out.println();
     
                 } 
     
                }
     
     
                }

  3. #3
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    Default Re: problem with my class

    nvm guys, I apologize. i messed with it enough and figured it out. i couldn't use a package with java as the name.

    package newstuff;
    import java.text.NumberFormat;
    import java.util.Scanner;
     
    public class tryValidatedInvoiceApp
    {
        public static void main(String[] args)
        {
            Scanner sc = new Scanner(System.in);
            String choice = "y";
     
     
            while (!choice.equalsIgnoreCase("n"))
            {
     
                System.out.print("Enter customer type (r/c): ");
                String customerType = sc.next();
     
                 if (customerType.equals("r"))
     
                 {
     
     
     
                  System.out.print("Enter subtotal:   ");
                    double subtotal = sc.nextDouble();
     
     
     
     
     
     
                // get the discount percent
                double discountPercent = 0;
                 if (customerType.equalsIgnoreCase("C"))
                {
                    if (subtotal < 250) {
                        discountPercent = .2;
                    }
                    else {
                        discountPercent = .3;
                    }
                }
                else {
                    discountPercent = .1;
                }
     
                // calculate the discount amount and total
                double discountAmount = subtotal * discountPercent;
                double total = subtotal - discountAmount;
     
                // format and display the results
                NumberFormat currency = NumberFormat.getCurrencyInstance();
                NumberFormat percent = NumberFormat.getPercentInstance();
                System.out.println(
                    "Discount percent: " + percent.format(discountPercent) + "\n" +
                    "Discount amount:  " + currency.format(discountAmount) + "\n" +
                    "Total:            " + currency.format(total) + "\n");
     
                // see if the user wants to continue
                System.out.print("Continue? (y/n): ");
                choice = sc.next();
                System.out.println();
     
                 }else if(customerType.equals("c"))
     
                 {
     
     
     
                  System.out.print("Enter subtotal:   ");
                    double subtotal = sc.nextDouble();
     
     
     
     
     
     
                // get the discount percent
                double discountPercent = 0;
                if (customerType.equalsIgnoreCase("R"))
                {
                    if (subtotal < 100) {
                        discountPercent = 0;
                    }
                    else if (subtotal >= 100 && subtotal < 250) {
                        discountPercent = .1;
                    }
                    else if (subtotal >= 250) {
                        discountPercent = .2;
                    }
                }
     
     
                // calculate the discount amount and total
                double discountAmount = subtotal * discountPercent;
                double total = subtotal - discountAmount;
     
                // format and display the results
                NumberFormat currency = NumberFormat.getCurrencyInstance();
                NumberFormat percent = NumberFormat.getPercentInstance();
                System.out.println(
                    "Discount percent: " + percent.format(discountPercent) + "\n" +
                    "Discount amount:  " + currency.format(discountAmount) + "\n" +
                    "Total:            " + currency.format(total) + "\n");
     
                // see if the user wants to continue
                System.out.print("Continue? (y/n): ");
                choice = sc.next();
                System.out.println();
     
     
     
     
     
     
                 } else
    		             {
    		                 sc.nextLine();//discard anything on the line
    		                 System.out.println("error! Invalid number.Try again.");
                     continue;}
     
                }
     
     
                }
     
    }

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