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Thread: Airline having with array index out of bounds exception

  1. #1
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    Default Airline having with array index out of bounds exception

    class test{//class
    public static void main(String[]args)
    {
    String booking [][]= new String [30] [6] ;//two dimensional array
    System.out.println("Enter the seat column you want");//column entry
    char column=Keyboard.readChar();
    System.out.println("Enter the seat row you want");//row entry
    int row=Keyboard.readInt();
    System.out.println("Enter your name");//name entry
    String name=Keyboard.readString();

    if(column=='a' || column =='A')
    {
    column='0';
    }
    else if(column=='b' || column=='B')
    {
    column='1';
    }
    else if(column=='c' || column=='C')
    {
    column='2';
    }
    else if(column=='d' || column=='D')
    {
    column='3';
    }
    else if(column=='e' || column=='E')
    {
    column='4';
    }
    else if(column=='f' || column=='F')
    {
    column='5';
    }
    System.out.println( name + " your seat is column " + column + " seat " +row);

    booking[column][row] = name;//put name into chosen index

    for(int i = 0; i < booking.length; i++)
    {
    for(int x = 0; x < booking[0].length; x++)
    {
    System.out.print(booking[i][x]+" ");
    }
    System.out.println();
    }
    }
    }




    /************************************************** ************
    could anyone help me having trouble with it
    cant get my in put to go in to the index

    eooro.png


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Airline having with array index out of bounds exception

    To copy the contents of the command prompt window:
    Click on Icon in upper left corner
    Select Edit
    Select 'Select All' - The selection will show
    Click in upper left again
    Select Edit and click 'Copy'

    Paste here.

    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE HERE
    [/code]
    to get highlighting and preserve formatting.
    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:

    dubs4sam (March 22nd, 2014)

  4. #3
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    Default Re: Airline having with array index out of bounds exception

    Enter the seat column you want
    C
    Enter the seat row you want
    22
    Enter your name
    Paul
    Paul your seat is column 2 seat 22

    This is the error i get

    Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 50
    at test.main(test.java:38)
    Press any key to continue . . .

    This is the error i get


    class test{//class
    	public static void main(String[]args)
    	{
    String  booking [][]= new  String [30] [6] ;//two dimensional array
    System.out.println("Enter the seat column you want");//column entry
    			char column=Keyboard.readChar();
    System.out.println("Enter the seat row you want");//row entry
    			int row=Keyboard.readInt();
    System.out.println("Enter your name");//name entry
    			String name=Keyboard.readString();
     
    		if(column=='a' || column =='A')
    			{
    			   column='0';
    			}
    		else if(column=='b' || column=='B')
    			{
    				column='1';
    			}
    		else if(column=='c' || column=='C')
    		   {
    				column='2';
    			}
    		else if(column=='d' || column=='D')
    			{
    				column='3';
    			}
    		else if(column=='e' || column=='E')
    			{
    				column='4';
    			}
    		else if(column=='f' || column=='F')
    			{
    				column='5';
    			}
    		System.out.println(  name + " your seat  is  column "  +  column + " seat "  +row);
     
    booking[column][row] = name;//put name into chosen index
     
    			for(int i = 0; i < booking.length; i++)
    				{
    					for(int x = 0; x < booking[0].length; x++)
    				{
    					System.out.print(booking[i][x]+" ");
    				}
    				System.out.println();
    		}
    	}
    }

  5. #4
    Super Moderator Norm's Avatar
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    Default Re: Airline having with array index out of bounds exception

    Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 50
    at test.main(test.java:38)
    At line 38 the code uses an array index with a value of 50 in an array that does not have 51 elements.
    Look at line 38 and check why the index used on that line is past the end of the array.

    What code is at line 38?
    If you don't understand my answer, don't ignore it, ask a question.

  6. #5
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    Default Re: Airline having with array index out of bounds exception

    Code at line 38



    booking[column][row] = name;//put name into chosen index

  7. #6
    Super Moderator Norm's Avatar
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    Default Re: Airline having with array index out of bounds exception

    What are the values of the variables: column and row?

    Why is column defined as char and not as an int? The char: '2' has an int value of 50.
    If you don't understand my answer, don't ignore it, ask a question.

  8. #7
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    Default Re: Airline having with array index out of bounds exception

    String  booking [][]= new  String [30] [6] ;//two dimensional array
    System.out.println("Enter the seat column you want");//column entry
    			char column=Keyboard.readChar();
    System.out.println("Enter the seat row you want");//row entry
    			int row=Keyboard.readInt();
    System.out.println("Enter your name");//name entry
    			String name=Keyboard.readString();
    column and row are values that are entered by the user
    column is defined as char because the user must selected a either A,B,C,D,E,F,
    AND THEN select a seat number associated with that row any number 1 to 30

    --- Update ---

    then the name should fill in to the appropriate position in the array booking to the row and column the user entered

  9. #8
    Super Moderator Norm's Avatar
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    Default Re: Airline having with array index out of bounds exception

    The char: 'A', 'B' can not be used as indexes into an array that expects int index values from 0.
    You can convert char to 0 based int values:
    To convert the char 'A' to a 0 subtract 'A' from it. For example 'B' - 'A' = 1

    Your usage of column and row are reversed from normal.
    Usually it is array[row][column]
    If you don't understand my answer, don't ignore it, ask a question.

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

    dubs4sam (March 22nd, 2014)

  11. #9
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    Default Re: Airline having with array index out of bounds exception

    THanks for the help much appreciated lad

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