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Thread: Problem with String (and integer) conversion!

  1. #1
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    Default Problem with String (and integer) conversion!

    The program below shows an array of "crayons". The user should be able to enter a number between 1-8 and show the appropriate crayon. Also, when the user type "end", it should terminate the program. My problem is that it ends the program when I type "end", but it's giving me the error. Since my variable is a String, to show the array, I've converted it to an integer using Integer.parseInt() method.

    The error:

    Exception in thread "main" java.lang.NumberFormatException: For input string: "end"
    	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    	at java.lang.Integer.parseInt(Integer.java:492)
    	at java.lang.Integer.parseInt(Integer.java:527)
    	at Crayon.main(Crayon.java:32)
    Java Result: 1

    Result:

    Color: Red 		Length in mm: 16 	Sharpness: 1
    Color: Yellow 		Length in mm: 17 	Sharpness: 4
    Color: Green 		Length in mm: 10 	Sharpness: 2
    Color: Blue 		Length in mm: 11 	Sharpness: 5
    Color: Brown 		Length in mm: 16 	Sharpness: 1
    Color: Black 		Length in mm: 23 	Sharpness: 2
    Color: Orange 		Length in mm: 29 	Sharpness: 3
    Color: Purple 		Length in mm: 17 	Sharpness: 4
    Which crayon you like to see? (1-8) 3
    That crayon is Color: Green 		Length in mm: 10 	Sharpness: 2
    Color: Red 		Length in mm: 16 	Sharpness: 1
    Color: Yellow 		Length in mm: 17 	Sharpness: 4
    Color: Green 		Length in mm: 10 	Sharpness: 2
    Color: Blue 		Length in mm: 11 	Sharpness: 5
    Color: Brown 		Length in mm: 16 	Sharpness: 1
    Color: Black 		Length in mm: 23 	Sharpness: 2
    Color: Orange 		Length in mm: 29 	Sharpness: 3
    Color: Purple 		Length in mm: 17 	Sharpness: 4
    Which crayon you like to see? (1-8) end
    Exception in thread "main" java.lang.NumberFormatException: For input string: "end"
    	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    	at java.lang.Integer.parseInt(Integer.java:492)
    	at java.lang.Integer.parseInt(Integer.java:527)
    	at Crayon.main(Crayon.java:32)
    Java Result: 1

    Code:

    import java.util.Scanner;
    import java.util.Random;
     
    public class Crayon {
     
        public static void main(String[] args) {
     
            Scanner scan = new Scanner(System.in);
            Random rand = new Random();
            String choice;
     
            choice = "";
     
            String[]crayon = {"Color: Red \t\tLength in mm: 16 \tSharpness: 1",
                              "Color: Yellow \t\tLength in mm: 17 \tSharpness: 4",
                              "Color: Green \t\tLength in mm: 10 \tSharpness: 2",
                              "Color: Blue \t\tLength in mm: 11 \tSharpness: 5",
                              "Color: Brown \t\tLength in mm: 16 \tSharpness: 1",
                              "Color: Black \t\tLength in mm: 23 \tSharpness: 2",
                              "Color: Orange \t\tLength in mm: 29 \tSharpness: 3",
                              "Color: Purple \t\tLength in mm: 17 \tSharpness: 4",}; 
     
            while(!choice.equals("end"))
            {
                for(int a=0; a<crayon.length; a++)
                {
                    System.out.println(crayon[a]);
                }
     
                System.out.print("Which crayon you like to see? (1-8) ");
                choice = scan.nextLine();            
                System.out.println("That crayon is " + crayon[Integer.parseInt(choice) - 1]);        
            }
        }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Problem with String (and integer) conversion!

    Check the value of choice for "end" before trying to convert it to an int.
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    tonynsx (November 7th, 2013)

  4. #3
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    Default Re: Problem with String (and integer) conversion!

    Quote Originally Posted by Norm View Post
    Check the value of choice for "end" before trying to convert it to an int.
    I'm sorry, but not sure if I understand.

  5. #4
    Super Moderator Norm's Avatar
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    Default Re: Problem with String (and integer) conversion!

    If string is not "end" then convert string to int
    If you don't understand my answer, don't ignore it, ask a question.

  6. #5
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    Default Re: Problem with String (and integer) conversion!

    Thank you so much, it works now

    Result:

    run:
    Color: Red 		Length in mm: 16 	Sharpness: 1
    Color: Yellow 		Length in mm: 17 	Sharpness: 4
    Color: Green 		Length in mm: 10 	Sharpness: 2
    Color: Blue 		Length in mm: 11 	Sharpness: 5
    Color: Brown 		Length in mm: 16 	Sharpness: 1
    Color: Black 		Length in mm: 23 	Sharpness: 2
    Color: Orange 		Length in mm: 29 	Sharpness: 3
    Color: Purple 		Length in mm: 17 	Sharpness: 4
    Which crayon you like to see? (1-8) type [end] to terminate 1
    That crayon is Color: Red 		Length in mm: 16 	Sharpness: 1
    Color: Red 		Length in mm: 16 	Sharpness: 1
    Color: Yellow 		Length in mm: 17 	Sharpness: 4
    Color: Green 		Length in mm: 10 	Sharpness: 2
    Color: Blue 		Length in mm: 11 	Sharpness: 5
    Color: Brown 		Length in mm: 16 	Sharpness: 1
    Color: Black 		Length in mm: 23 	Sharpness: 2
    Color: Orange 		Length in mm: 29 	Sharpness: 3
    Color: Purple 		Length in mm: 17 	Sharpness: 4
    Which crayon you like to see? (1-8) type [end] to terminate 2
    That crayon is Color: Yellow 		Length in mm: 17 	Sharpness: 4
    Color: Red 		Length in mm: 16 	Sharpness: 1
    Color: Yellow 		Length in mm: 17 	Sharpness: 4
    Color: Green 		Length in mm: 10 	Sharpness: 2
    Color: Blue 		Length in mm: 11 	Sharpness: 5
    Color: Brown 		Length in mm: 16 	Sharpness: 1
    Color: Black 		Length in mm: 23 	Sharpness: 2
    Color: Orange 		Length in mm: 29 	Sharpness: 3
    Color: Purple 		Length in mm: 17 	Sharpness: 4
    Which crayon you like to see? (1-8) type [end] to terminate end
    BUILD SUCCESSFUL (total time: 6 seconds)

    New Code:

    import java.util.Scanner;
    import java.util.Random;
     
    public class Crayon {
     
        public static void main(String[] args) {
     
            Scanner scan = new Scanner(System.in);
            Random rand = new Random();
            String choice;
     
            choice = "";
     
            String[]crayon = {"Color: Red \t\tLength in mm: 16 \tSharpness: 1",
                              "Color: Yellow \t\tLength in mm: 17 \tSharpness: 4",
                              "Color: Green \t\tLength in mm: 10 \tSharpness: 2",
                              "Color: Blue \t\tLength in mm: 11 \tSharpness: 5",
                              "Color: Brown \t\tLength in mm: 16 \tSharpness: 1",
                              "Color: Black \t\tLength in mm: 23 \tSharpness: 2",
                              "Color: Orange \t\tLength in mm: 29 \tSharpness: 3",
                              "Color: Purple \t\tLength in mm: 17 \tSharpness: 4",}; 
     
            while(!choice.equals("end"))
            {
                for(int a=0; a<crayon.length; a++)
                {
                    System.out.println(crayon[a]);
                }
     
                System.out.print("Which crayon you like to see? (1-8) type [end] to terminate ");
                choice = scan.nextLine();          
     
                //If string is not "end" then convert string to int 
     
                if(!choice.equals("end"))
                {
                    System.out.println("That crayon is " + crayon[Integer.parseInt(choice) - 1]);  
                }   
            }
        }
    }

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