Problem with Point-Array

I made the following method:
Point[] makeLine (int length)
          Point[] newLine = new Point[length];
          for (int i = 0; i < newLine.length; i++)
               newLine.x = i;
               newLine[i].y = (int)Math.round(Math.random()*5+1);
          return newLine;
to make a Line that randomly jumps and stuff.
Compiles fine, but when i want to run it i get a NullPointerExeption at
newLine.x = i;
when i comment that one out i get the same error on the line after .
I absolutely cant find the mistake, can anybody help me please?
Thanks in advance

You have defined an array, but you need to put objects into the array. i.e. when an array is created, every value is initlaised to null. The OO way to do this is
newLine[i] = new Point(i, (int) (Math.random()*5+1));Note round may not be the best choice as this will round down/up 50% of the time. This means each value does not have an equal chance of occuring.

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  • Aperture performance problems with Lacie array

    I have an iMac with 32GB memory and, due to space requirements, an external LaCie 2Big2 disk array, with 2 x 6GB disks in a RAID-1 (mirroring) configuration and attached via USB3.
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    What exactly has changed?
         I don't know exactly. Something changes every day on a working system!  However I have not installed any new software or hardware.
    Did this start after a software update?
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    Hi,
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    Code:
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                   int allocateTo = -100;
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         }These are the calls I make in a separate method:
    ArrayList<CourseworkTimeBlock> courseworkTimetableOne = new ArrayList<CourseworkTimeBlock>();
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             courseworkTimetableOne = courseworkAllocation(fixedTimetable, courseworkBlocks);
             courseworkTimetableTwo = courseworkAllocation(fixedTimetable, courseworkBlocks);Edited by: ChrisUK on Mar 1, 2008 9:11 AM

    ChrisUK wrote:
    Thanks for the reply.
    In terms of the:
    courseworkTimetableOne = courseworkAllocation(fixedTimetable, courseworkBlocks);
    courseworkTimetableTwo = courseworkAllocation(fixedTimetable, courseworkBlocks);They are both supposed to pass in the fixedTimetable object, the reason being is that this is a timetable and is passed through in order to find it "free time" blocks.
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    You've got two references pointing to the same object.
    The fact that you do this first:
    ArrayList<CourseworkTimeBlock> courseworkTimetableOne = new ArrayList<CourseworkTimeBlock>();
    ArrayList<CourseworkTimeBlock> courseworkTimetableTwo = new ArrayList<CourseworkTimeBlock>();means nothing. You create the two new ArrayLists, but then this
    courseworkTimetableOne = courseworkAllocation(fixedTimetable, courseworkBlocks);
    courseworkTimetableTwo = courseworkAllocation(fixedTimetable, courseworkBlocks);gets rid of them. The new ArrayLists you just created are lost.
    Remember when you assign to a reference variable such as courseworkTimetableOne =, all that does is copy a reference so now courseworkTimetableOne is pointing to the same object that whatever is on the RHS is pointing to.
    If you want two different lists, then either courseworkAllocation should make a copy of its internal list and return that, or else the caller should do it.
    >
    By the way what does "SSCCE" mean?[http://mindprod.com/jgloss/sscce.html|http://mindprod.com/jgloss/sscce.html]
    [http://homepage1.nifty.com/algafield/sscce.html|http://homepage1.nifty.com/algafield/sscce.html]

  • Problem with instantiating array

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            }//end while
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    Edited by: Toadums on Jan 20, 2009 6:07 PM

    ah of course! Thanks!
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  • Problem With Referenced Array Loading

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    I'm not having any problems in writing the program, except there's something going wrong with my attempt to write a method to load the array. The method declaration is:
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              int units; // the number of units in the transaction
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              String date; // the date of the transaction
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              Scanner file; // reads input from a user selected file
              Scanner parse; // reads input from the file's current record
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                   parse = new Scanner(record).useDelimiter(",");
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                   type = parse.next().toUpperCase().charAt(0);
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                   unitCost = parse.nextDouble();
                   transactionArray[logicalSize] = new Transaction(date, itemID, type, units, unitCost); // loads the current transaction into the array
                   logicalSize++;
              return logicalSize;
         }Thanks!
    Oh, I guess I should also add that the variable input is a global variable of type Scanner.
    static Scanner input = new Scanner(System.in); // reads input from keyboardMessage was edited by:
    Kristofer.Ward

    Now, I'm under the impression (and my teacher confirmed this) that arrays are
    passed by reference.Java passes references to arrays by value.
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    last bit is that your loadArray() is free to assign a reference to a completely
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    That's what's happening here:public static int loadArray(Transaction[] transactionArray, int size) throws Exception
        // declarations of local variables
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  • Problem with bidim Array  - increases to double why ? Anyone plz???

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              for(int i =1; i != h.length; i++){
                   for(int j= 1; j != h.length; j++){
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              tabu.drawboard(14, 10, "A");
              tabu.drawboard(7,18,"P");
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    Message was edited by:
    Java__Estudante

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                for (int j = 0; j < h.length; j++) {
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    } else if (h[i][j] == null) {
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    private final int numColu = 48;
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       private double itemNumber;     //  class variable that stores the item number
       private double unitsInStock; // class variable that stores the number of units in stock
       private double pricePerUnit; // class variable that stores price of each unit
       private String nameOfDvd;  //class variable for the name of DVD
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          unitsInStock = 0.0;
          pricePerUnit = 0.0;
          nameOfDvd = "";
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       public double getitemNumber()  // Method to get the item number
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       public void setunitsInStock(double units)  // Method to set the units in stock
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       public double getunitsInStock()  // Method to get the units in stock
          return unitsInStock;
       public void setpricePerUnit(double price)  // Method to set the price per unit
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       public double getpricePerUnit()     //Method to get price per unit
            return pricePerUnit;
       public void setnameOfDvd(String name)  // Method to set the name of DVD
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       public double calculateInventoryValue()  // Method to calculate inventory value
          return unitsInStock * pricePerUnit;
    }//end class DVD
    public class Inventory2Array
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       public static void main( String args[])
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          Scanner input = new Scanner( System.in );
          // Instantiate product array
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           DVD = new Product [5];
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        DVD[0] = new Product("The Faculty", 1, 10, 10.00);
         DVD[1] = new Product("Shaun of the Dead", 2, 10, 10.00);
        DVD[2] = new Product("Spider Man 3", 3, 20, 20.00);
         DVD[3] = new Product("House M.D. Season 3", 4, 10, 45.00);
         DVD[4] = new Product("Clerks Special Edition", 5, 10, 25.00);
          // Print out a screen title
          System.out.printf("DVD Inventory\n\n");
          // call the sort
          Arrays.sort( inventory );
                 System.out.println( DVD.toString() );
          for(j=0; j<3; ++j)
              System.out.printf("Inventory %s Products $ %.2f\n\n\n",
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                                 //display the inventory value
       } // end main method
       public static void sortProduct(Product[] inventory)
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          int i, j;
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             for (j=0; j < inventory.length-i; j++)
                if (inventory[j].getnameOfDvd().compareTo(inventory[j+1].getnameOfDvd())>0)
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                   temp = inventory[j];
                   inventory[j] = inventory[j+1];
                   inventory[j+1] = temp;
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    {code}import java.util.Scanner; //program uses Scanner
    class DVD
    private double itemNumber; // class variable that stores the item number
    private double unitsInStock; // class variable that stores the number of units in stock
    private double pricePerUnit; // class variable that stores price of each unit
    private String nameOfDvd; //class variable for the name of DVD
    public DVD() // Constructor for the DVD class
    itemNumber = 0.0;
    unitsInStock = 0.0;
    pricePerUnit = 0.0;
    nameOfDvd = "";
    public void setitemNumber(double number) // Method to set the item number
    itemNumber = number;
    public double getitemNumber() // Method to get the item number
    return itemNumber;
    public void setunitsInStock(double units) // Method to set the units in stock
    unitsInStock = units;
    public double getunitsInStock() // Method to get the units in stock
    return unitsInStock;
    public void setpricePerUnit(double price) // Method to set the price per unit
         pricePerUnit = price;
    public double getpricePerUnit()     //Method to get price per unit
         return pricePerUnit;
    public void setnameOfDvd(String name) // Method to set the name of DVD
    nameOfDvd = name;
    public double calculateInventoryValue() // Method to calculate inventory value
    return unitsInStock * pricePerUnit;
    }//end class DVD
    class Inventory2Array
    // main methods begins execution of java application
    public static void main( String args[])
    // create Scanner to obtain input from command window
    Scanner input = new Scanner( System.in );
    // Instantiate product array
    Product [] dvds;
    dvds = new Product [5];
    // Instantiate objects for the array
    dvds[0] = new Product("The Faculty", 1, 10, 10.00);
         dvds[1] = new Product("Shaun of the Dead", 2, 10, 10.00);
    dvds[2] = new Product("Spider Man 3", 3, 20, 20.00);
         dvds[3] = new Product("House M.D. Season 3", 4, 10, 45.00);
         dvds[4] = new Product("Clerks Special Edition", 5, 10, 25.00);
    // Print out a screen title
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    // call the sort
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              System.out.println(dvds);
    public class InventoryProgram1
              //main method begins execution of Java
              public static void main (String args [])
                   //create Scanner to obtain input from command window
                   Scanner input = new Scanner (System.in);
    double itemNumber = 0.0; // variable that stores the item number
    double unitsInStock = 0.0; // variable that stores the units in stock
    double pricePerUnit = 0.0; // variable that stores the price per unit
    double InventoryValue = 0.0; // variable that stores inventory value
    String nameOfDvd = ""; // DVD name
    //create InventoryProgram1 object and assign to myInventoryProgram1
    InventoryProgram1 myInventoryProgram1 = new InventoryProgram1 ();
    System.out.print ("Item Number:\n");
    System.out.print("DVD Name:\n");
    System.out.print("Units In Stock:\n");
    System.out.print("Price Per Unit:\n");
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    {code}

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