Databases
StackOverflow2013
Postsdbo
POproblem with extending classes
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POproblem with extending classes
    primarykey
    data
    text
    <p>I'm making Braid. I have a class <code>Wall</code> that prevents that an object goes into a wall. Everything with <code>Wall</code> is working. But now I'm trying to make the same with the ceilings. My ceiling class extends <code>Wall</code>. I've simply made a constructor like this:</p> <pre><code>public Ceiling(boolean deadly, int[] xPositions, int[] yPositions) { super(deadly, Direction.Down, //Enum: the direction you have to leave the wall (Left, Right) //Here of course down xPositions, yPositions); } </code></pre> <p>Now I have in my level-class an <code>ArrayList</code> of all the Walls and an <code>ArrayList</code> of all the Ceilings. I have to add the Walls on this way:</p> <pre><code>walls.add(new Wall(false, Direction.Right, ..., ...)); </code></pre> <p>And the Ceilings on this way:</p> <pre><code>ceilings.add(new Ceiling(false, ..., ...)); </code></pre> <p>The <code>...</code> replaces the coordinates.</p> <p>If I check if there is an object in a Ceiling: there has nothing happened: the object goes through the ceiling. And if I use this way to add a Ceiling, it works:</p> <pre><code>ceilings.add(new Wall(false, Direction.Down, ..., ...)); </code></pre> <p>I hope I've explained well. Does somebody know what the problem is??</p> <p>Thanks</p> <p><strong>Edit:</strong></p> <p>This is my collition code:</p> <pre><code>public boolean intersects(Rectangle r) { if (!bounds.intersects(r)) { return false; } for (int i = 1; i &lt; yPositions.length; i++) { Line l = new Line(xPositions[i - 1], yPositions[i - 1], xPositions[i], yPositions[i]); if (r.intersectsLine(l)) { return true; } } return false; } </code></pre> <p><strong>My Code</strong> <hr> '<code>doodelijk</code>' means deadly</p> <p>Wall:</p> <pre><code>package levels; import domein.Direction; import java.awt.Point; import java.awt.Rectangle; import java.awt.geom.Line2D; import java.awt.geom.Point2D; import java.awt.geom.Rectangle2D; public class Wall { public boolean doodelijk; public int[] yPositions; public int[] xPositions; private Rectangle bounds; public Direction directionToLeave; public Wall(boolean doodelijk, Direction directionToLeave, int[] yPositions, int[] xPositions) { this.doodelijk = doodelijk; this.yPositions = yPositions; this.xPositions = xPositions; this.directionToLeave = directionToLeave; createRectangle(); } public boolean intersects(Rectangle r) { if (!bounds.intersects(r)) { return false; } for (int i = 1; i &lt; yPositions.length; i++) { Line l = new Line(xPositions[i - 1], yPositions[i - 1], xPositions[i], yPositions[i]); if (r.intersectsLine(l)) { return true; } } return false; } private void createRectangle() { int x = Integer.MAX_VALUE; int y = Integer.MAX_VALUE; int x1 = 0; int y1 = 0; for (int i = 0; i &lt; xPositions.length; i++) { int tx = xPositions[i]; int ty = yPositions[i]; if (x &gt; tx) { x = tx; } if (y &gt; ty) { y = ty; } if (x1 &lt; tx) { x1 = tx; } if (y1 &lt; ty) { y1 = ty; } } bounds = new Rectangle(x, y, x1 - x + 1, y1 - y +1); System.out.println("Rect: " + bounds); } class Line extends Line2D { Point2D p1; Point2D p2; public Line() { p1 = new Point(); p2 = new Point(); } public Line(Point2D p1, Point2D p2) { this.p1 = p1; this.p2 = p2; } public Line(double X1, double Y1, double X2, double Y2) { this(); setLine(X1, Y1, X2, Y2); } @Override public double getX1() { return p1.getX(); } @Override public double getY1() { return p1.getY(); } @Override public Point2D getP1() { return p1; } @Override public double getX2() { return p2.getX(); } @Override public double getY2() { return p2.getY(); } @Override public Point2D getP2() { return p2; } @Override public void setLine(double X1, double Y1, double X2, double Y2) { p1.setLocation(X1, Y1); p2.setLocation(X2, Y2); } public Rectangle2D getBounds2D() { return new Rectangle((int) getX1(), (int) getY1(), (int) (getX2() - getX1()), (int) (getX2() - getY1())); } } public void setXpositions(int ... xPos) { this.xPositions = xPos; } public void setYpositions(int ... yPos) { this.yPositions = yPos; } public void setPositions(int[] yPos, int[] xPos) { setXpositions(xPos); setYpositions(yPos); } } </code></pre> <p>Ceiling:</p> <pre><code>package levels; import domein.Direction; public class Ceiling extends Wall { public Ceiling(boolean doodelijk, int[] xPositions, int[] yPositions) { super(doodelijk, Direction.Down, yPositions, xPositions); } } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMat
    1. USMartijn Courteaux
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COYou are making Braid? Last I checked Braid was already made and released. I can't find any reference to you making Braid?
      singulars
      1. POproblem with extending classes
      1. USMike McQuaid
    2. COErr, what actually is the problem?
      singulars
      1. POproblem with extending classes
      1. USoxbow_lakes
    3. COSo what is exactly your question; how to call the superclass constructor in class Ceiling? Without seeing the rest of your code, it's very difficult to tell you what's wrong. Run the code in an IDE (Eclipse or NetBeans for example) and use the debugger to step through the code, to follow line by line what happens when the program runs.
      singulars
      1. POproblem with extending classes
      1. USJesper
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload