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  1. #1
    andrewmills is offline Member
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    Default Need help with nullpointerexception

    Hi, I am having problem with my program. When I compile the program it says i have the null pointer exception. I think I am doing something wrong with the default constructor Polygon(). Any suggestions will be greatly appreciated. Below is the code for the program:

    Java Code:
    
    import java.text.NumberFormat;
    import java.util.*;
    
    public class Foothill
    {
       public static void main(String[] args) throws Exception
       {
          //declare and initialize objects
          Point samplePoint1, samplePoint2;
          samplePoint1 = new Point();
          samplePoint2 = new Point();
    
          //set the minimum and maximum value of the coordinates
          Point.setRange(-20.0, 20.0);
    
          //set value for point object
          samplePoint1.set(-16, 25);
          samplePoint2.set(6.3, 14.7);
    
          //display the points
          samplePoint1.displayPoint();
          samplePoint2.displayPoint();
    
          //reset and display the value of samplePoint2
          samplePoint2.set(-3.4, -9);
          samplePoint2.displayPoint();
    
          //testing mutators for data filtering
          if (samplePoint1.set(-14,21) == false)
             System.out.println("Unable to set the coordinates to (-14,21)");
          else
             System.out.println("Coordiantes have been set to (-14, 21)");
          if (samplePoint1.set(-20.001, 20.001) == false)
             System.out.println("Unable to set the coordiantes to (-20.001, 20.001)");
          else 
             System.out.println("Coordiantes have to been set to (-20.001, 20.001)");
    
          //declare and initialize arrays   
          double[] xValue1 = {-2, -7, 7, -1, 9};
          double[] yValue1 = {-6.5, 7.56, 8.99, 3.3, 9.99};
          double[] xValue2 = {4.0, 6.0, -5.5, 2};
          double[] yValue2 = {-5, 4.2, -5.6, 11};
          double[] xValue3 =  {20, 0, 1.56};
          double[] yValue3 = {10, 5.5, -6};
    
          //declare and initialize objects for class "Polygon"
          Polygon samplePolygon1, samplePolygon2, samplePolygon3;
          samplePolygon1 = new Polygon();
          samplePolygon2 = new Polygon(4, xValue2, yValue2);
          samplePolygon3 = new Polygon(3, xValue3, yValue3);
          //set the points for object samplePolygon1
          samplePolygon1.setPoints(5, xValue1, yValue1);
    
          //display the points involved for each polygon
          samplePolygon1.showPolygon();
          samplePolygon2.showPolygon();
          samplePolygon3.showPolygon();
    
          //add points in the polygons
          samplePolygon2.addPoint(-19.99, 15);
          samplePolygon3.addPoint(3, 5);
          samplePolygon1.addPoint(-20, 15);
          samplePolygon1.addPoint(11, 14);
       }
    }
    
    //introduce and define class "Point"
    class Point
    {
       //instance data
       private double x;
       private double y;
       private static double MIN_VAL;
       private static double MAX_VAL;
    
       //default constructor without parameters
       public Point()
       {
          //initialize the minimum and maximum value of co-ordinate
          MIN_VAL = -10.0;
          MAX_VAL = 10.0;
    
          //declare variable
          double coOrdinate;
    
          //calculate the co-ordinates for a point
          coOrdinate = (MIN_VAL + MAX_VAL)/2;
          x = coOrdinate;
          y = coOrdinate;
       }
    
       //parameters taking constructor
       public Point(double x, double y)
       {
          if (!set(x, y))
             set(0,0);
       }
    
       //mutator
       boolean set(double x, double y)
       {
          if (x < MIN_VAL || x > MAX_VAL)
             return false;
          else
             this.x = x;
    
          if (y < MIN_VAL || y > MAX_VAL)
             return false;
          else
             this.y = y;
          return true;
       }
    
       //accessors
       double getX()
       {
          return x;
       }
    
       double getY()
       {
          return y;
       }
    
       //display the coordinates of the point
       public void displayPoint()
       {
          System.out.println("(" + getX() + ", " + getY() + ")");
       }
    
       //allow the user to set the minimum and maximum value of the coordinates
       public static boolean setRange(double newMinVal, double newMaxVal)
       {
          //maximum  value has to be greater than the minimum value 
          if (newMaxVal <= newMinVal)
             return false;
          else
          {
             MIN_VAL = newMinVal;
             MAX_VAL = newMaxVal; 
          }
    
          return true;
       } 
    }
    
    
    //introduce and define class "Polygon"
    class Polygon
    {
       //constant static data
       public static final int MAX_POINTS = 75;
    
       //instance data members
       private int numPoints;
       private Point[] points;
       private double[] xArray;
       private double[] yArray;
    
       //default constructor without parameter
       public Polygon()
       {
          numPoints = 0;
          points = new Point[MAX_POINTS];
          //setPoints(0, new double[]{0.0}, new double[]{0});
          int k;
          for (k = 0; k < points.length; k++)
          {  
             points[k].set(0, 0);
             this.points[k] = points[k];
          }
       }
    
       //parameters taking constructors
       public Polygon(int numpoints, double xArray[], double yArray[])
       {
          if (!setPoints(numpoints, xArray, yArray))
          { numPoints = 0;
          int k;
          setPoints(0, new double[]{0.0}, new double[]{0});
          points = new Point[MAX_POINTS];
          for (k = 0; k < points.length; k++)
             points[k].set(0, 0);
          }
       }
    
       //mutators
       public boolean setPoints(int numPoints, double xValues[], double yValues[])
       {
    
          if (numPoints < 0)
             return false;
    
          if (points.length < numPoints)
             return false;
    
          if(xValues.length != yValues.length)
             return false;
    
          else
          {  
             this.numPoints = numPoints;
             //declare variable
             int K;
    
             for (K = 0; K < numPoints; K++)
             {
                points[K].set(xValues[K], yValues[K]);
             }
          }
    
          return true;
       }
    
       //function to display all the points involved to draw the polygon
       public void showPolygon()
       {
          //declare and initialize variables
          int K;
    
    
          if (numPoints == 0)
             System.out.println("There is not a single point assigned to the polygon");
    
          String allThePoints = new String("(" + points[0].getX() + ", " + points[0].getY() + ")");
          for (K = 1; K < numPoints; K++ )
          {
             allThePoints = allThePoints + ", " + "(" + points[K].getX() + ", " + points[K].getY() + ")";
          }
       }
    
       //function that let the user store additional point
       boolean addPoint( double x, double y)
       {
          numPoints = numPoints + 1;
          //only if the points array can store more value
          if (numPoints > points.length)
             return false;
          else
          { 
             points[numPoints - 1].set(x, y);
          }
          return true;
       }
    
       //function that let you store additional point 
       boolean addPoint(Point p)
       {
          numPoints = numPoints + 1;
          //only if the points array can store more value
          if (numPoints > points.length)
             return false;
          else
             points[numPoints - 1] = p;
    
          return true;  
       }
    }
    Below is the message I get when I compile the program:
    [note]
    Exception in thread "main" java.lang.NullPointerException
    at Polygon.<init>(Foothill.java:170)
    at Foothill.main(Foothill.java:49)
    [/note]
    Last edited by andrewmills; 12-08-2012 at 06:50 AM.

  2. #2
    Fubarable's Avatar
    Fubarable is offline Moderator
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    Default Re: Need help with nullpointerexception

    Quote Originally Posted by andrewmills View Post
    Below is the message I get when I compile the program:
    Java Code:
    Exception in thread "main" java.lang.NullPointerException
    	at Polygon.<init>(Foothill.java:170)
    	at Foothill.main(Foothill.java:49)
    No, that's impossible as you can't get NPE from compilation. It can only be thrown when you run the program, and that's a big difference.

    The key to solving a NPE, and the thing you haven't told us is knowing the line that throws it because on that line you are using a variable that is in fact null. Once you have identified the variable, you can track back in your code and find out why it has not been given a valid reference.

    So on that note, please show us which lines are involved with this exception? Which lines are line 49 and 170 of your Foothill class?

  3. #3
    Fubarable's Avatar
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    Default Re: Need help with nullpointerexception

    When you identify the line, here's a suggestion to help you better visualize the problem and its solution. Visualize a reference array, meaning an array of objects not primitives like ints, as being similar to an egg carton. If you create the array, you've only created the carton, and you've not yet filled it with eggs. You can't start using eggs in the carton and cooking with them until you've first put eggs into the carton, until you've first put objects into the array.

  4. #4
    andrewmills is offline Member
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    Default Re: Need help with nullpointerexception

    Hi Fubarable. Thank you so much for your response. The problems I am having are in the lines below:

    Line 170:
    Java Code:
     points[k].set(0, 0);
    Line 49:
    Java Code:
    samplePolygon1 = new Polygon();
    And, I think my problem is with the array points[]. Since, this array has a type of class Point, I am not really sure how to put the objects into it. If it was array of type String, double or int, I would know how to initialize it.

  5. #5
    Fubarable's Avatar
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    Default Re: Need help with nullpointerexception

    You need to fill it with Point objects. Consider using a for loop and placing the Point objects into it that way, but doing so in the constructor right after creating the array and before using it.

  6. #6
    andrewmills is offline Member
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    Default Re: Need help with nullpointerexception

    Quote Originally Posted by Fubarable View Post
    You need to fill it with Point objects. Consider using a for loop and placing the Point objects into it that way, but doing so in the constructor right after creating the array and before using it.
    I am not sure if this is how you put the point objects or not. But, I tried doing it anyway and it did not work. Here is how I redefined my constructor Polygon():
    Java Code:
    public Polygon()
       {
          numPoints = 0;
          points = new Point[MAX_POINTS];
          //setPoints(0, new double[]{0.0}, new double[]{0});
          int k;
          for (k = 0; k < points.length; k++)
          {  
             this.points[k] = points[k];
                   }
       }
    I think I should mention that after redefining my constructor as above, when I try to run the program, I am getting error in different lines. The errors I am getting are in Lines:
    Line 196:
    Java Code:
    if (points.length < numPoints)
    Line 177:

    Java Code:
    if (!setPoints(numpoints, xArray, yArray))
    Line 50:
    Java Code:
    samplePolygon2 = new Polygon(4, xValue2, yValue2);
    Below is the complete code for the program:

    Java Code:
    import java.text.NumberFormat;
    import java.util.*;
    
    public class Foothill
    {
       public static void main(String[] args) throws Exception
       {
          //declare and initialize objects
          Point samplePoint1, samplePoint2;
          samplePoint1 = new Point();
          samplePoint2 = new Point();
    
          //set the minimum and maximum value of the coordinates
          Point.setRange(-20.0, 20.0);
    
          //set value for point object
          samplePoint1.set(-16, 25);
          samplePoint2.set(6.3, 14.7);
    
          //display the points
          samplePoint1.displayPoint();
          samplePoint2.displayPoint();
    
          //reset and display the value of samplePoint2
          samplePoint2.set(-3.4, -9);
          samplePoint2.displayPoint();
    
          //testing mutators for data filtering
          if (samplePoint1.set(-14,21) == false)
             System.out.println("Unable to set the coordinates to (-14,21)");
          else
             System.out.println("Coordiantes have been set to (-14, 21)");
          if (samplePoint1.set(-20.001, 20.001) == false)
             System.out.println("Unable to set the coordiantes to (-20.001, 20.001)");
          else 
             System.out.println("Coordiantes have to been set to (-20.001, 20.001)");
    
          //declare and initialize arrays   
          double[] xValue1 = {-2, -7, 7, -1, 9};
          double[] yValue1 = {-6.5, 7.56, 8.99, 3.3, 9.99};
          double[] xValue2 = {4.0, 6.0, -5.5, 2};
          double[] yValue2 = {-5, 4.2, -5.6, 11};
          double[] xValue3 =  {20, 0, 1.56};
          double[] yValue3 = {10, 5.5, -6};
    
          //declare and initialize objects for class "Polygon"
          Polygon samplePolygon1, samplePolygon2, samplePolygon3;
          samplePolygon1 = new Polygon();
          samplePolygon2 = new Polygon(4, xValue2, yValue2);
          samplePolygon3 = new Polygon(3, xValue3, yValue3);
          //set the points for object samplePolygon1
          samplePolygon1.setPoints(5, xValue1, yValue1);
    
          //display the points involved for each polygon
          samplePolygon1.showPolygon();
          samplePolygon2.showPolygon();
          samplePolygon3.showPolygon();
    
          //add points in the polygons
          samplePolygon2.addPoint(-19.99, 15);
          samplePolygon3.addPoint(3, 5);
          samplePolygon1.addPoint(-20, 15);
          samplePolygon1.addPoint(11, 14);
       }
    }
    
    //introduce and define class "Point"
    class Point
    {
       //instance data
       private double x;
       private double y;
       private static double MIN_VAL;
       private static double MAX_VAL;
    
       //default constructor without parameters
       public Point()
       {
          //initialize the minimum and maximum value of co-ordinate
          MIN_VAL = -10.0;
          MAX_VAL = 10.0;
    
          //declare variable
          double coOrdinate;
    
          //calculate the co-ordinates for a point
          coOrdinate = (MIN_VAL + MAX_VAL)/2;
          x = coOrdinate;
          y = coOrdinate;
       }
    
       //parameters taking constructor
       public Point(double x, double y)
       {
          if (!set(x, y))
             set(0,0);
       }
    
       //mutator
       boolean set(double x, double y)
       {
          if (x < MIN_VAL || x > MAX_VAL)
             return false;
          else
             this.x = x;
    
          if (y < MIN_VAL || y > MAX_VAL)
             return false;
          else
             this.y = y;
          return true;
       }
    
       //accessors
       double getX()
       {
          return x;
       }
    
       double getY()
       {
          return y;
       }
    
       //display the coordinates of the point
       public void displayPoint()
       {
          System.out.println("(" + getX() + ", " + getY() + ")");
       }
    
       //allow the user to set the minimum and maximum value of the coordinates
       public static boolean setRange(double newMinVal, double newMaxVal)
       {
          //maximum  value has to be greater than the minimum value 
          if (newMaxVal <= newMinVal)
             return false;
          else
          {
             MIN_VAL = newMinVal;
             MAX_VAL = newMaxVal; 
          }
    
          return true;
       } 
    }
    
    
    //introduce and define class "Polygon"
    class Polygon
    {
       //constant static data
       public static final int MAX_POINTS = 75;
    
       //instance data members
       private int numPoints;
       private Point[] points;
       private double[] xArray;
       private double[] yArray;
    
       //default constructor without parameter
       public Polygon()
       {
          numPoints = 0;
          points = new Point[MAX_POINTS];
          //setPoints(0, new double[]{0.0}, new double[]{0});
          int k;
          for (k = 0; k < points.length; k++)
          {  
             this.points[k] = points[k];
          }
       }
    
       //parameters taking constructors
       public Polygon(int numpoints, double xArray[], double yArray[])
       {
          if (!setPoints(numpoints, xArray, yArray))
          { numPoints = 0;
          int k;
          setPoints(0, new double[]{0.0}, new double[]{0});
          points = new Point[MAX_POINTS];
          for (k = 0; k < points.length; k++)
          {  
             this.points[k] = points[k];
          }
          }
       }
    
       //mutators
       public boolean setPoints(int numPoints, double xValues[], double yValues[])
       {
    
          if (numPoints < 0)
             return false;
    
          if (points.length < numPoints)
             return false;
    
          if(xValues.length != yValues.length)
             return false;
    
          else
          {  
             this.numPoints = numPoints;
             //declare variable
             int K;
    
             for (K = 0; K < numPoints; K++)
             {
                points[K].set(xValues[K], yValues[K]);
             }
          }
    
          return true;
       }
    
       //function to display all the points involved to draw the polygon
       public void showPolygon()
       {
          //declare and initialize variables
          int K;
    
    
          if (numPoints == 0)
             System.out.println("There is not a single point assigned to the polygon");
    
          String allThePoints = new String("(" + points[0].getX() + ", " + points[0].getY() + ")");
          for (K = 1; K < numPoints; K++ )
          {
             allThePoints = allThePoints + ", " + "(" + points[K].getX() + ", " + points[K].getY() + ")";
          }
       }
    
       //function that let the user store additional point
       boolean addPoint( double x, double y)
       {
          numPoints = numPoints + 1;
          //only if the points array can store more value
          if (numPoints > points.length)
             return false;
          else
          { 
             points[numPoints - 1].set(x, y);
          }
          return true;
       }
    
       //function that let you store additional point 
       boolean addPoint(Point p)
       {
          numPoints = numPoints + 1;
          //only if the points array can store more value
          if (numPoints > points.length)
             return false;
          else
             points[numPoints - 1] = p;
    
          return true;  
       }
    }
    Last edited by andrewmills; 12-08-2012 at 07:53 AM.

  7. #7
    andrewmills is offline Member
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    Default Re: Need help with nullpointerexception

    I am sorry that's not how I redefine my constructor. I copied the wrong code. This is how I actually redefined my constructor:
    Java Code:
    //default constructor without parameter
       public Polygon()
       {
          numPoints = 0;
          points = new Point[MAX_POINTS];
          //setPoints(0, new double[]{0.0}, new double[]{0});
          int k;
          for (k = 0; k < points.length; k++)
          {  
             this.points[k] = new Point();
                   }
       }
    Below is my complete code for the program:

    Java Code:
    import java.text.NumberFormat;
    import java.util.*;
    
    public class Foothill
    {
       public static void main(String[] args) throws Exception
       {
          //declare and initialize objects
          Point samplePoint1, samplePoint2;
          samplePoint1 = new Point();
          samplePoint2 = new Point();
    
          //set the minimum and maximum value of the coordinates
          Point.setRange(-20.0, 20.0);
    
          //set value for point object
          samplePoint1.set(-16, 25);
          samplePoint2.set(6.3, 14.7);
    
          //display the points
          samplePoint1.displayPoint();
          samplePoint2.displayPoint();
    
          //reset and display the value of samplePoint2
          samplePoint2.set(-3.4, -9);
          samplePoint2.displayPoint();
    
          //testing mutators for data filtering
          if (samplePoint1.set(-14,21) == false)
             System.out.println("Unable to set the coordinates to (-14,21)");
          else
             System.out.println("Coordiantes have been set to (-14, 21)");
          if (samplePoint1.set(-20.001, 20.001) == false)
             System.out.println("Unable to set the coordiantes to (-20.001, 20.001)");
          else 
             System.out.println("Coordiantes have to been set to (-20.001, 20.001)");
    
          //declare and initialize arrays   
          double[] xValue1 = {-2, -7, 7, -1, 9};
          double[] yValue1 = {-6.5, 7.56, 8.99, 3.3, 9.99};
          double[] xValue2 = {4.0, 6.0, -5.5, 2};
          double[] yValue2 = {-5, 4.2, -5.6, 11};
          double[] xValue3 =  {20, 0, 1.56};
          double[] yValue3 = {10, 5.5, -6};
    
          //declare and initialize objects for class "Polygon"
          Polygon samplePolygon1, samplePolygon2, samplePolygon3;
          samplePolygon1 = new Polygon();
          samplePolygon2 = new Polygon(4, xValue2, yValue2);
          samplePolygon3 = new Polygon(3, xValue3, yValue3);
          //set the points for object samplePolygon1
          samplePolygon1.setPoints(5, xValue1, yValue1);
    
          //display the points involved for each polygon
          samplePolygon1.showPolygon();
          samplePolygon2.showPolygon();
          samplePolygon3.showPolygon();
    
          //add points in the polygons
          samplePolygon2.addPoint(-19.99, 15);
          samplePolygon3.addPoint(3, 5);
          samplePolygon1.addPoint(-20, 15);
          samplePolygon1.addPoint(11, 14);
       }
    }
    
    //introduce and define class "Point"
    class Point
    {
       //instance data
       private double x;
       private double y;
       private static double MIN_VAL;
       private static double MAX_VAL;
    
       //default constructor without parameters
       public Point()
       {
          //initialize the minimum and maximum value of co-ordinate
          MIN_VAL = -10.0;
          MAX_VAL = 10.0;
    
          //declare variable
          double coOrdinate;
    
          //calculate the co-ordinates for a point
          coOrdinate = (MIN_VAL + MAX_VAL)/2;
          x = coOrdinate;
          y = coOrdinate;
       }
    
       //parameters taking constructor
       public Point(double x, double y)
       {
          if (!set(x, y))
             set(0,0);
       }
    
       //mutator
       boolean set(double x, double y)
       {
          if (x < MIN_VAL || x > MAX_VAL)
             return false;
          else
             this.x = x;
    
          if (y < MIN_VAL || y > MAX_VAL)
             return false;
          else
             this.y = y;
          return true;
       }
    
       //accessors
       double getX()
       {
          return x;
       }
    
       double getY()
       {
          return y;
       }
    
       //display the coordinates of the point
       public void displayPoint()
       {
          System.out.println("(" + getX() + ", " + getY() + ")");
       }
    
       //allow the user to set the minimum and maximum value of the coordinates
       public static boolean setRange(double newMinVal, double newMaxVal)
       {
          //maximum  value has to be greater than the minimum value 
          if (newMaxVal <= newMinVal)
             return false;
          else
          {
             MIN_VAL = newMinVal;
             MAX_VAL = newMaxVal; 
          }
    
          return true;
       } 
    }
    
    
    //introduce and define class "Polygon"
    class Polygon
    {
       //constant static data
       public static final int MAX_POINTS = 75;
    
       //instance data members
       private int numPoints;
       private Point[] points;
       private double[] xArray;
       private double[] yArray;
    
       //default constructor without parameter
       public Polygon()
       {
          numPoints = 0;
          points = new Point[MAX_POINTS];
          //setPoints(0, new double[]{0.0}, new double[]{0});
          int k;
          for (k = 0; k < points.length; k++)
          {  
             this.points[k] = new Point();
          }
       }
    
       //parameters taking constructors
       public Polygon(int numpoints, double xArray[], double yArray[])
       {
          if (!setPoints(numpoints, xArray, yArray))
          { numPoints = 0;
          int k;
          //setPoints(0, new double[]{0.0}, new double[]{0});
          points = new Point[MAX_POINTS];
          for (k = 0; k < points.length; k++)
          {  
             this.points[k] = new Point();
          }
          }
       }
    
       //mutators
       public boolean setPoints(int numPoints, double xValues[], double yValues[])
       {
    
          if (numPoints < 0)
             return false;
    
          if (points.length < numPoints)
             return false;
    
          if(xValues.length != yValues.length)
             return false;
    
          else
          {  
             this.numPoints = numPoints;
             //declare variable
             int K;
    
             for (K = 0; K < numPoints; K++)
             {
                points[K].set(xValues[K], yValues[K]);
             }
          }
    
          return true;
       }
    
       //function to display all the points involved to draw the polygon
       public void showPolygon()
       {
          //declare and initialize variables
          int K;
    
    
          if (numPoints == 0)
             System.out.println("There is not a single point assigned to the polygon");
    
          String allThePoints = new String("(" + points[0].getX() + ", " + points[0].getY() + ")");
          for (K = 1; K < numPoints; K++ )
          {
             allThePoints = allThePoints + ", " + "(" + points[K].getX() + ", " + points[K].getY() + ")";
          }
       }
    
       //function that let the user store additional point
       boolean addPoint( double x, double y)
       {
          numPoints = numPoints + 1;
          //only if the points array can store more value
          if (numPoints > points.length)
             return false;
          else
          { 
             points[numPoints - 1].set(x, y);
          }
          return true;
       }
    
       //function that let you store additional point 
       boolean addPoint(Point p)
       {
          numPoints = numPoints + 1;
          //only if the points array can store more value
          if (numPoints > points.length)
             return false;
          else
             points[numPoints - 1] = p;
    
          return true;  
       }
    }
    Following are the errors I am getting when I run the program;

    Line 197:
    Java Code:
     if (points.length < numPoints)
             return false; //line 197
    Line 178
    Java Code:
    public Polygon(int numpoints, double xArray[], double yArray[])
       {
          if (!setPoints(numpoints, xArray, yArray))
          { numPoints = 0; //Line 178

    line 50:
    Java Code:
          samplePolygon2 = new Polygon(4, xValue2, yValue2);

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