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Thread: 2D Array Question

  1. #1
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    Default 2D Array Question

    Let's say in one class I have a 2D array with rows 16 and columns 6 named AirPlaneSeatInitializer. Now in another class I have code that prompts the user to input data named AirPlane. For this particular program it also asks what class the user wants (First, Business, Economy)...

    I would like to take the data (2) that was just entered into variable inValue2, and put it into the 2D array, changing the element value from * to X. Also, if the element value is already an X, that element is skipped over and it searches for the next element in the array. Furthermore, the seats must be adjoining.

    How would I go about doing that? I understand the logic: if ( inValue2 > 0 ) array element [i][j] = X

    I already have the code to display the current seating arrangement without user data being entered, and I have already set it up to prompt the user for all of the input data...
    Last edited by gmorris1986; June 18th, 2010 at 12:41 PM.


  2. #2
    Member Faz's Avatar
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    Default Re: 2D Array Question

    Why don't you put up the code you already have?

  3. #3
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    Default Re: 2D Array Question

    Here is the AirPlaneSeatInitializer class containing the 2D array...

    import javax.swing.*;
     
    public class AirPlaneSeatInitializer
    {
      private static String [] seatLayout = {"4509", "2707", "1606", "1505", "3507", "3306", "3005", "4208"};
     
      private static int layOutController = -1;
     
     
      /**
       * Returns the number of rows in a seat layout string of the form ####
       *
       * @return int  the int value number of rows
       */
      public static int getRows(String layOut)
      {
        return Integer.parseInt(layOut.substring(0, 2));
      }
     
      /**
       * Returns the number of columns in a seat layout string of the form ####
       *
       * @return int  the int value number of columns
       */
      public static int getColumns(String layOut)
      {
        return Integer.parseInt(layOut.substring(2));
      }
     
      /**
       * Resets the object so that is may be used again
       */
      public static void reset()
      {
       layOutController = -1;
      }
     
     
      /**
       * Checks if the object contains more layout strings.
       *
       * @return true if there are more Layout Strings. Returns false otherwise.
       */
      public static boolean hasMoreLayoutStrings()
      {
       if (layOutController < seatLayout.length - 1)
         return true;
     
       return false;
      }
     
     
      /**
       * Returns the next Layout stirng in the object. Must use with hasMoreLayoutStrings()
       *
       * @return String the Layout String Objects
       */
      public static String getNextLayoutString()
      {
       layOutController++;
     
       return seatLayout[layOutController];
      }
     
      /**
       * User can pick a plane randomly with a particular layout
       *
       * @return  String  the plane's payout in the form ####
       */
      public static String pickAPlaneWithLayout()
      {
        int selected = -1;
        while (selected < 0 || selected > 7)
        {
          double val = Math.random() * 10;
          //System.out.println(val);
          selected = (int) val;
          //System.out.println(selected);
        }
     
        return seatLayout[selected];
      }
     
     
     
      private static void showSeats(char [][]seatArray)
      {
        for (int i = 0; i < seatArray.length; i++)
        {
         for (int j = 0; j < seatArray[0].length; j++)
          System.out.print("" +seatArray[i][j]+ " ");
         System.out.println("\n");
        }
      }
     
      /**
       * Given number of rows and columns, this method will return a 2-D array
       * of with some cells filled with 'C' and some filled with 'X'. The number
       * of rows must within the range 15 to 45 and the number of columns must
       * within the range 5 to 9.
       *
       * @return char[][]  a 2-D character array.
       */
      public static char [][]get2DSeatsArrayForAirPlane( int rows, int cols)
      {
       char [][] seatsArray = new char[rows][cols];
       int seatsFilled = 0;
     
       if ((rows > 45 || rows < 15) || (cols < 5 || cols > 9))
       {
         JOptionPane.showMessageDialog(null, "Your request cannot be granted. Please\n" +
                                              "enter a valid number of rows and/or\n" +
                                              "valid number of seats per row.\n" +
                                              "Rangers allowed - 15 <= rows <= 45 and\n"+
                                              "5 <= seats-per-row <= 9.", "Error",
                                              JOptionPane.ERROR_MESSAGE);
     
         return null;
       }
     
     
       for (int i = 0; i < seatsArray.length; i++)
         for (int j = 0; j < seatsArray[0].length; j++)
           seatsArray[i][j] = 'X';
     
       seatsArray [0][0]           = 'C';
       seatsArray [0][cols-1]      = 'C';
       seatsArray [rows-1][0]      = 'C';
       seatsArray [rows-1][cols-1] = 'C';
       seatsFilled = 4;
     
       if (rows < 28)
       {
        seatsArray [(rows-1)/2][0]    = 'C';
        seatsArray [(rows-1)/2][cols-1] = 'C';
        seatsFilled += 2;
       }
       else
       if (rows >= 28)
       {
        seatsArray [(int)(rows* 0.25)][0]      = 'C';
        seatsArray [(int)(rows* 0.25)][cols-1] = 'C';
        seatsArray [(int)(rows* 0.75) - 2][0]      = 'C';
        seatsArray [(int)(rows* 0.75) - 2][cols-1] = 'C';
        seatsFilled += 4;
       }
     
        int seed = -1;
        //Find a % to dynamically fill the seats
        //any percent between 0% and 80%
        while (seed < 0 || seed > 80)
        {
          double val = Math.random() * 100;
          //System.out.println(val);
          seed = (int) val;
          //System.out.println(seed);
     
        }
     
        //calculate the number of sets to be filled
        int seatsToBeFilled = seatsFilled + (rows * cols)* seed/100;
     
       int currentFill = 0;
       int row_pos = -1 , col_pos = -1;
       while (currentFill < seatsToBeFilled)
       {
        //randomly find a row
        row_pos = -1 ;
        while (row_pos < 0 || row_pos > rows-1)
        {
          double val = Math.random() * 100;
          //System.out.println(val);
          row_pos = (int) val;
        }
     
        //Randomly find a col
        col_pos = -1;
        while (col_pos < 0 || col_pos > cols-1)
        {
          double val = Math.random() * 100;
          //System.out.println(val);
          col_pos = (int) val;
        }
     
        //Randomly fill a seat
        if (seatsArray[row_pos][col_pos] == 'X')
        {
         seatsArray[row_pos][col_pos] = '*';
         currentFill++;
        }
       }//end outer while
     
       return seatsArray;
      }
     
     /** public static void main(String[] args)
      {
      	AirPlaneSeatInitializer.reset();
      		char ary[][] = get2DSeatsArrayForAirPlane(45, 9);
      	System.out.println("Rows : " +  ary.length + ", Cols : " + ary[0].length);
      		for (int i = 0; i < ary.length-1; i++)
      	{
      			for (int j = 0; j < ary[0].length-1; j++)
      			{
     
      				System.out.print(ary[i][j] + " ");
      			}
      			System.out.println("");
      		}
     
      	}
      	**/
    }

    And here is the AirPlane class that prompts the user for the data...

    import javax.swing.*;
    import java.util.*;
     
    public class AirPlane 
    {
       public static void main (String args[]) 
       {
     
          String input1 = JOptionPane.showInputDialog("Welcome to the Airline Reservation System!\n\nPlease select your option:\n1. Reserve a seat\n2. Show current seating by rows\n3. Exit");
     
          int inValue1 = Integer.parseInt(input1);
     
          if ( inValue1 == 1 )
          {
             String input2 = JOptionPane.showInputDialog("Enter the number of adult passengers: ");
     
    	 int inValue2 = Integer.parseInt(input2);
     
    	 String input3 = JOptionPane.showInputDialog("Enter the number of passengers under 2:");
     
    	 int inValue3 = Integer.parseInt(input3);
     
    	 if ( inValue3 > 0 )
    	 {
    	    JOptionPane.showMessageDialog(null, "You must have been assigned to the Economy class.", "Economy Class", JOptionPane.PLAIN_MESSAGE);
    	 }
     
    	 if ( inValue3 > inValue2 )
    	 {
    	    JOptionPane.showMessageDialog(null, "You must have at least 1 adult per 1 child!", "Error", JOptionPane.ERROR_MESSAGE);
    	 }
     
    	 if ( inValue3 < 1 )
    	 {
    	    String input5 = JOptionPane.showInputDialog("Select you class: F = First B = Business E = Economy");
    	 }
     
          }
     
          else if ( inValue1 == 2 )
          {
    	 String input4 = JOptionPane.showInputDialog("Which rows would you like to view?\n\n1. Rows 1-4\n2. Rows 5-8\n3. Rows 9-12\n4. Rows 13-16\n5. All Rows");
     
    	 int inValue4 = Integer.parseInt(input4);
     
    	 if ( inValue4 == 1 )
    	 {
      		char ary[][] = AirPlaneSeatInitializer.get2DSeatsArrayForAirPlane(16, 6);
      	    	System.out.println("Rows : 1-4, Cols : " + ary[0].length);
      		for (int i = 0; i < 4; i++)
      		{
      			for (int j = 0; j < ary[0].length-1; j++)
      			{
     
      				System.out.print(ary[i][j] + " ");
      			}
      			System.out.println("");
      		}
    	 }
     
    	 if ( inValue4 == 2 )
    	 {
    	    	char ary[][] = AirPlaneSeatInitializer.get2DSeatsArrayForAirPlane(16, 6);
      	    	System.out.println("Rows : 5-8, Cols : " + ary[0].length);
      		for (int i = 4; i < 8; i++)
      		{
      			for (int j = 0; j < ary[0].length-1; j++)
      			{
     
      				System.out.print(ary[i][j] + " ");
      			}
      			System.out.println("");
      		}
    	 }
     
    	 if ( inValue4 == 3 )
    	 {
    	    	char ary[][] = AirPlaneSeatInitializer.get2DSeatsArrayForAirPlane(16, 6);
      	    	System.out.println("Rows : 9-12, Cols : " + ary[0].length);
      		for (int i = 8; i < 12; i++)
      		{
      			for (int j = 0; j < ary[0].length-1; j++)
      			{
     
      				System.out.print(ary[i][j] + " ");
      			}
      			System.out.println("");
      		}
    	 }
     
    	 if ( inValue4 == 4 )
    	 {
    	    	char ary[][] = AirPlaneSeatInitializer.get2DSeatsArrayForAirPlane(16, 6);
      	    	System.out.println("Rows : 13-16, Cols : " + ary[0].length);
      		for (int i = 12; i < 16; i++)
      		{
      			for (int j = 0; j < ary[0].length-1; j++)
      			{
     
      				System.out.print(ary[i][j] + " ");
      			}
      			System.out.println("");
      		}
    	 }
     
    	 if ( inValue4 == 5 )
    	 {
     
      		char ary[][] = AirPlaneSeatInitializer.get2DSeatsArrayForAirPlane(16, 6);
      		System.out.println("Rows : " +  ary.length + ", Cols : " + ary[0].length);
      		for (int i = 0; i < ary.length-1; i++)
      		{	
      			for (int j = 0; j < ary[0].length-1; j++)
      			{
     
      				System.out.print(ary[i][j] + " ");
      			}
      			System.out.println("");
      		}
     
          if ( inValue1 == 3 )
          {
             System.exit(0);
          }
     
      	 }
          }
       }
    }

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