Mathias Nilsson

Ok! It is a tetris like game. Here is the code.
import java.awt.Color; import java.awt.Graphics; public class Square2 extends Object{ private int _width; private int _height; private Color _color; private boolean _isOccupied = false; private int _number; private int _getXPos; // Lagt till i som argument. Vi m�ste veta vilken Square vi �r public Square2( int width , int height , int i ){ this._height = width; this._width = height; this._number = i; } public int getXPos(){ return this._getXPos; } public void setXPos( int w ){ this._getXPos = w; } protected void setOccupied( boolean o ){ this._isOccupied = o; } protected boolean isOccupied(){ return this._isOccupied; } protected void setColor( Color c ){ this._color = c; } public Color getColor(){ if( this._color != null ){ return this._color; }else{ return new Color( 0, 0, 0 ); } } protected int getSquareWidth(){ return this._width; } protected int getSquareHeight(){ return this._height; } protected void setSquareNumber( int n ){ this._number = n; } protected int getSquareNumber(){ return this._number; } }
The Grid class
import java.util.Vector; import java.awt.Graphics; import java.awt.Color; public class Grid2 extends Object{ private Vector squares = new Vector(); private int _totalSquaresInGrid; private int _totalRowsInGrid; private int _totalSquareInRow; private final int _squareHeight = 16; private final int _squareWidth = 16; public Grid2( int rows , int squaresInRow ){ this._totalSquaresInGrid = rows * squaresInRow; this._totalSquareInRow = squaresInRow; this._totalRowsInGrid = rows; for( int k = 0; k < this._totalSquaresInGrid; k++ ){ this.squares.addElement( new Square2( _squareWidth , _squareHeight , k ) ); } } public void setSquareOccupiedBySquareNumber( int squareNumber, boolean o ){ this.getSquare( squareNumber ).setOccupied( o ); } public boolean getSquareOccupiedBySquareNumber( int squareNumber ){ return this.getSquare( squareNumber ).isOccupied(); } public int getTotalSquaresInRow(){ return this._totalSquareInRow; } public int getTotalSquaresInGrid(){ return _totalSquaresInGrid; } public int getTotalRowsInGrid(){ return this._totalRowsInGrid; } public int getGridWidth(){ int j = 0; for( int k = 0; k < this._totalSquaresInGrid; k++ ){ j += this.getSquare( k ).getSquareWidth(); } return j; } public int getGridHeight(){ int j = 0; for( int k = 0; k < this.getTotalSquaresInGrid(); k++ ){ j += this.getSquare( k ).getSquareHeight(); } return j; } public Square2 getSquare( int n ){ if( this.getTotalSquaresInGrid() >= n && ( n >= 0 ) ){ return ( Square2 ) squares.elementAt( n ); }else{ return null; } } public void paint( Graphics g ){ for( int i = 0; i < this.getTotalSquaresInGrid(); i++ ){ g.setColor( this.getSquare( i ).getColor() ); // M�lar fyrkanterna g.fillRect( this.getSquareXPositionBySquareNumber( i ) , this.getSquareYPositionBySquareNumber( i ) , this.getSquare( i ).getSquareWidth() , this.getSquare( i ).getSquareHeight() ); g.setColor( this.getSquare( i ).getColor().darker() ); g.drawLine( this.getSquareXPositionBySquareNumber( i ) , this.getSquareYPositionBySquareNumber( i ) + ( this.getSquare( i ).getSquareHeight() - 1 ) , this.getSquareXPositionBySquareNumber( i ) + ( this.getSquare( i ).getSquareWidth() - 1 ), this.getSquareYPositionBySquareNumber( i ) + ( this.getSquare( i ).getSquareHeight() - 1 ) ); g.drawLine( this.getSquareXPositionBySquareNumber( i ) + ( this.getSquare( i ).getSquareWidth() - 1 ) , this.getSquareYPositionBySquareNumber( i ) , this.getSquareXPositionBySquareNumber( i ) + ( this.getSquare( i ).getSquareWidth() - 1) , this.getSquareYPositionBySquareNumber( i ) + ( this.getSquare( i ).getSquareHeight()- 1 ) ); g.setColor( this.getSquare( i ).getColor().brighter() ); g.drawLine( this.getSquareXPositionBySquareNumber( i ) + 1, this.getSquareYPositionBySquareNumber( i ) + 1 , this.getSquareXPositionBySquareNumber( i ) + 1 + ( this.getSquare( i ).getSquareWidth() - 2 ) , this.getSquareYPositionBySquareNumber( i ) + 1 ); g.drawLine( this.getSquareXPositionBySquareNumber( i ) + 1, this.getSquareYPositionBySquareNumber( i ) + 1 , this.getSquareXPositionBySquareNumber( i ) + 1 , this.getSquareYPositionBySquareNumber( i ) + 1 + ( this.getSquare( i ).getSquareHeight() + 1 - 2 ) ); g.setColor( new Color( 0, 0, 0 ) ); g.drawLine( this.getSquareXPositionBySquareNumber( i ) , this.getSquareYPositionBySquareNumber( i ) , this.getSquareXPositionBySquareNumber( i ) + ( this.getSquare( i ).getSquareWidth() - 1 ), this.getSquareYPositionBySquareNumber( i ) ); g.drawLine( this.getSquareXPositionBySquareNumber( i ) , this.getSquareYPositionBySquareNumber( i ) , this.getSquareXPositionBySquareNumber( i ) , this.getSquareYPositionBySquareNumber( i ) + ( this.getSquare( i ).getSquareHeight() - 1 ) ); } } protected int getSquareYPositionBySquareNumber( int squareNumber ){ if( squareNumber < 0 || squareNumber > this.getTotalSquaresInGrid() ){ return -1; }else{ return (int) ( Math.floor( this.getSquare( squareNumber ).getSquareNumber() / this.getTotalSquaresInRow() ) ) * this.getSquare( squareNumber ).getSquareHeight(); } } protected int getSquareXPositionBySquareNumber( int squareNumber ){ if( squareNumber < 0 || squareNumber > this.getTotalSquaresInGrid() ){ return -1; }else{ return ( this.getSquare( squareNumber ).getSquareNumber() % this.getTotalSquaresInRow() ) * this.getSquare( squareNumber ).getSquareWidth(); } } }
The Shape class
import java.util.Vector; import java.awt.Color; import java.awt.Graphics; public class Shape2{ private int _currentRoutation = 0; private int _maxRoutation; private int _figure; private Vector _squares = new Vector(); private Grid2 _grid; private final int _startPos = -4; private int[] _positions = new int[ 4 ]; private int _current0Pos; private int dummy = 0; public Shape2( int figure , boolean randomise, Grid2 g ){ this._grid = g; this._figure = figure; if( randomise ){ this._currentRoutation = this.randomiseRoutation(); }else{ this._currentRoutation = 0; } this._current0Pos = _startPos; this._squares.addElement( new Square2( 16 , 16 , 0 ) ); this._squares.addElement( new Square2( 16 , 16 , 0 ) ); this._squares.addElement( new Square2( 16 , 16 , 0 ) ); this._squares.addElement( new Square2( 16 , 16 , 0 ) ); this.switchShape(); this.setShape(); } public Square2 getSquare( int n ){ return ( Square2 ) _squares.elementAt( n ); } public void switchShape(){ switch( this.getFigure() ){ case 0: // Pyramid like figure switch( this._currentRoutation ){ case 0: _positions[ 0 ] = this._current0Pos; _positions[ 1 ] = this._current0Pos + 1; _positions[ 2 ] = this._current0Pos - 1; _positions[ 3 ] = this._current0Pos - this._grid.getTotalSquaresInRow(); dummy = 0 * 16; break; case 1: _positions[ 0 ] = this._current0Pos - this._grid.getTotalSquaresInRow(); _positions[ 1 ] = this._current0Pos - ( this._grid.getTotalSquaresInRow() * 2 ); _positions[ 2 ] = this._current0Pos; _positions[ 3 ] = this._current0Pos - this._grid.getTotalSquaresInRow() - 1; dummy = 0 * 16; break; case 2 : _positions[ 0 ] = this._current0Pos - this._grid.getTotalSquaresInRow() ; _positions[ 1 ] = this._current0Pos - this._grid.getTotalSquaresInRow() - 1; _positions[ 2 ] = this._current0Pos - this._grid.getTotalSquaresInRow() + 1; _positions[ 3 ] = this._current0Pos; dummy = 0 * 16; break; case 3 : _positions[ 0 ] = this._current0Pos - this._grid.getTotalSquaresInRow() ; _positions[ 1 ] = this._current0Pos; _positions[ 2 ] = this._current0Pos - ( this._grid.getTotalSquaresInRow() * 2 ); _positions[ 3 ] = this._current0Pos - this._grid.getTotalSquaresInRow() + 1; dummy = 0 * 16; break; } break; case 1: // Kub switch( this._currentRoutation ){ case 0: _positions[ 0 ] = this._current0Pos; _positions[ 1 ] = this._current0Pos + 1; _positions[ 2 ] = this._current0Pos - this._grid.getTotalSquaresInRow(); _positions[ 3 ] = this._current0Pos - this._grid.getTotalSquaresInRow() + 1; dummy = 0 * 16; break; } break; case 2: // stapel switch( this._currentRoutation ){ case 0: _positions[ 0 ] = this._current0Pos; _positions[ 1 ] = this._current0Pos - this._grid.getTotalSquaresInRow(); _positions[ 2 ] = this._current0Pos - ( this._grid.getTotalSquaresInRow() * 2 ); _positions[ 3 ] = this._current0Pos - ( this._grid.getTotalSquaresInRow() * 3 ); dummy = 0 * 16; break; case 1: _positions[ 0 ] = this._current0Pos + 1; _positions[ 1 ] = this._current0Pos; _positions[ 2 ] = this._current0Pos - 1; _positions[ 3 ] = this._current0Pos - 2; dummy = 2 * 16; break; } break; } } public void setShape(){ this.getSquare( 0 ).setSquareNumber( _positions[ 0 ] ); this.getSquare( 1 ).setSquareNumber( _positions[ 1 ] ); this.getSquare( 2 ).setSquareNumber( _positions[ 2 ] ); this.getSquare( 3 ).setSquareNumber( _positions[ 3 ]); for( int i = 0; i < 4; i++ ){ if( this._grid.getSquare( this.getSquare( i ).getSquareNumber() ) != null ){ this._grid.getSquare( this.getSquare( i ).getSquareNumber() ).setOccupied( true ); this._grid.getSquare( this.getSquare( i ).getSquareNumber() ).setColor( this.getColor() ); } } } public void moveDown(){ if( this.canMoveDown() ){ this.clearCurrentShape(); for( int i = 0; i < 4 ; i++ ){ this.getSquare( i ).setSquareNumber( this.getSquare( i ).getSquareNumber() + this._grid.getTotalSquaresInRow() ); } this._current0Pos += this._grid.getTotalSquaresInRow(); this.restoreCurrentShape(); } } public void moveRight(){ if( this.canMoveRight() ){ this.clearCurrentShape(); for( int i = 0; i < 4 ; i++ ){ this.getSquare( i ).setSquareNumber( this.getSquare( i ).getSquareNumber() + 1 ); } this._current0Pos += 1; this.restoreCurrentShape(); } } public void moveLeft(){ if( this.canMoveLeft() ){ this.clearCurrentShape(); for( int i = 0; i < 4 ; i++ ){ this.getSquare( i ).setSquareNumber( this.getSquare( i ).getSquareNumber() - 1 ); } this._current0Pos =- 1; this.restoreCurrentShape(); } } public void clearCurrentShape(){ for( int i = 0; i < 4 ; i++ ){ if( this._grid.getSquare( this.getSquare( i ).getSquareNumber() ) != null ){ this._grid.getSquare( this.getSquare( i ).getSquareNumber() ).setOccupied( false ); this._grid.getSquare( this.getSquare( i ).getSquareNumber() ).setColor( new Color( 0, 0, 0 ) ); } } } public void restoreCurrentShape(){ for( int i = 0; i < 4 ; i++ ){ if( this._grid.getSquare( this.getSquare( i ).getSquareNumber() ) != null ){ this._grid.getSquare( this.getSquare( i ).getSquareNumber() ).setOccupied( true ); this._grid.getSquare( this.getSquare( i ).getSquareNumber() ).setColor( this.getColor() ); } } } public boolean canMoveDown(){ boolean returnValue = true; this.clearCurrentShape(); for( int i = 0; i < 4; i++ ){ if( this._grid.getSquare( this.getSquare( i ).getSquareNumber() + this._grid.getTotalSquaresInRow() ) != null ){ if( this._grid.getSquare( this.getSquare( i ).getSquareNumber() + this._grid.getTotalSquaresInRow() ).isOccupied() ){ returnValue = false; } }else{ returnValue = false; } if( !returnValue ){ break; } } for( int i = 0; i < 4; i++ ){ if( this.getSquare( i ).getSquareNumber() < 0 ){ returnValue = true; } } this.restoreCurrentShape(); return returnValue; } public boolean canMoveRight(){ boolean returnValue = true; this.clearCurrentShape(); for( int i = 0; i < 4; i++ ){ if( this._grid.getSquare( this.getSquare( i ).getSquareNumber() + 1 ) != null ){ if( ( int ) ( Math.floor( this.getSquare( i ).getSquareNumber() % this._grid.getTotalSquaresInRow() )) + 1 == this._grid.getTotalSquaresInRow() ){ returnValue = false; } if( this._grid.getSquare( this.getSquare( i ).getSquareNumber() + 1 ).isOccupied() ){ returnValue = false; } }else{ returnValue = false; } if( !returnValue ){ break; } } this.restoreCurrentShape(); return returnValue; } public boolean canMoveLeft(){ boolean returnValue = true; this.clearCurrentShape(); for( int i = 0; i < 4; i++ ){ if( this._grid.getSquare( this.getSquare( i ).getSquareNumber() - 1 ) != null ){ if( ( int ) ( Math.floor( this.getSquare( i ).getSquareNumber() % this._grid.getTotalSquaresInRow() )) == 0 ){ returnValue = false; } if( this._grid.getSquare( this.getSquare( i ).getSquareNumber() - 1 ).isOccupied() ){ returnValue = false; } }else{ returnValue = false; } if( !returnValue ){ break; } } this.restoreCurrentShape(); return returnValue; } public int getFigure(){ return this._figure; } public void routateLeft(){ if( this.canRoutateLeft() ){ } } public boolean canRoutateLeft(){ boolean returnValue = true; } public int getMaxRoutationByFigure(){ int i = 0; switch( this.getFigure() ){ case 0: // PYRAMID LIKE FIGURE i = 3; break; case 1: // KUB i = 0; break; case 2: // STAPEL i = 1; break; case 3: // L-Figur i = 3; break; case 4: // J-Figur i = 3; break; case 5: // J-Figur i = 1; break; case 6: // 2-Figur i = 1; break; } return i; } /** * Funktion f�r att retunera ett slumpartat nummer * som �r inom r�tt spann f�r den aktiverade figuren * * @return randomise routation * */ public int randomiseRoutation(){ int i = this.getMaxRoutationByFigure(); if( i > 0 ){ i++; } return ( int )( Math.random() * i ); } public int getCurrentRoutation(){ return this._currentRoutation; } public Color getColor(){ Color c; switch( this.getFigure() ){ case 0: // PYRAMID LIKE FIGURE c = new Color( 0 , 178 , 0 ); break; case 1: // KUB c = new Color( 165 , 215 , 239 ); break; case 2: // STAPEL c = new Color( 231 , 56 , 8 ); break; case 3: // L-Figur c = new Color( 231 , 174 , 0 ); break; case 4: // J-Figur c = new Color( 198 , 182 , 255 ); break; case 5: // Z-Figur c = new Color( 247 , 174 , 255 ); break; case 6: // 2-Figur c = new Color( 0 , 81 , 156 ); break; default : c = new Color( 0 , 0 , 0 ); break; } return c; } }
The Applet
/** Startade med denna klass 2004-04-12 22:48 f�r att g�ra mitt f�rsta spel. Falling Blocks 1.0 Err: F�rsta felet. Kan endast f� appleten att fungera i appletviewer och inte i browsern. Solv: Appleten m�ste kompileras med "-target 1.1" */ import java.awt.Graphics; import java.awt.Color; import java.awt.Rectangle; import java.awt.event.*; import java.awt.Event; import java.awt.Image; public class FallingBlocks2 extends java.applet.Applet implements Runnable, KeyListener{ Thread runner; Grid2 _grid; Shape2 _shape; Graphics _offScreenGraphics; Image _image; public void init(){ setBackground( new Color( 0 , 0 , 0 ) ); this.addKeyListener( this ); this.requestFocus(); _grid = new Grid2( 20 , 10 ); _image = createImage( _grid.getGridWidth() , _grid.getGridHeight() ); _offScreenGraphics = _image.getGraphics(); _shape = new Shape2( this.randomiseFigure() , true , _grid ); _grid.getSquare( 74 ).setOccupied( true ); _grid.getSquare( 74 ).setColor( new Color( 123 , 123 , 123 ) ); } public void start(){ if( runner == null ){ runner = new Thread( this ); runner.start(); } } public void stop(){ if( runner != null ){ runner = null; } } public void run(){ while( true ){ try{ Thread.sleep( 600 ); }catch( InterruptedException e ){ } //_shape.moveRight(); repaint(); } } public void paint( Graphics g ){ _grid.paint( _offScreenGraphics ); //_shape.paint( _offScreenGraphics ); g.drawImage( _image , 0 , 0 , this ); } public int randomiseFigure(){ return ( int )( Math.random() * 3 ); } public void update( Graphics g ){ paint( g ); } /** Handle the key typed event from the text field. */ public void keyTyped(KeyEvent e) { } /** Handle the key pressed event from the text field. */ public void keyPressed(KeyEvent e) { switch( e.getKeyCode() ){ case KeyEvent.VK_UP: _shape.routateLeft(); break; case KeyEvent.VK_DOWN: _shape.moveDown(); break; case KeyEvent.VK_LEFT: _shape.moveLeft(); break; case KeyEvent.VK_RIGHT: _shape.moveRight(); break; } } /** Handle the key released event from the text field. */ public void keyReleased(KeyEvent e) { } }
The classes are compiled with -target 1.1. I use java sdk 1.4
Hope this helps!

I get this exception when i display my applet in a browser.
I can get i directly after load or when i reload the browser page.
Does anybody have a solution to this problem?

Something like this
I create a Object like this
function Menu(){ this.items = new Array(); this.addItem = addItem; } function addItem( parentId , id , link , name ){ this.items[ this.items.length ] = new menuObject( parentId , id , etc... ) } function menuObject( etc.. ){ }
I would like every menuItem to be a object and to have it's own paint method and so on. The problem is that i don't know how to do the loop and to paint the whole menu ....
by the way... the menu I looking for is something like the one used here.
I developed the site myself but I can't figure out how to make the menu in more than one step.
[ April 15, 2004: Message edited by: Mathias Nilsson ]

Hi all!
I'm trying to make a javascript menu that don't have a limit in how many children it can have.
I don't want to use layers since i have to make a own scrollbar. ( If the menu expands you can't see the entire menu ).
So i've desided to make the menu in the frameset and then go parent.menu.paint() from the frame.
My biggest problem is that I can't get my adding a child to a parent thing to work. How do you make a linked list in javascript?
I don't want a URL to a complete meny since I like to do it myself but it's difficult to know how to linked the parents and children in a menu.
Please help!
// Mathias

If you declare a class "abstract" then it cannot be instantiated. That is you can't make an instance of it.
The diffrence between an abstract class and a interface is that an abstract class can have none abstract methods.
If you should make a abstract class of a man,woman,boy,etc then you should try to locate something that they all have incommon.
Ears, Eyes, head, neck, body, and so on.
In an abstract class you can return values in a method
public abstract class Human{ int _years; String _name; public Human( int y , String name ){ this._years = y; this._name = name; } public int getYear(){ return this._years; } } } public class Girl extends Human{ int y; String n; public Girl( int y, String n ){ super( y , n ); this.y = y; this.n = n; } public int getYear(){ return this.y; } public static void main( String args[] ){ Girl g = new Girl( 2 , "Little John" ); System.out.println( g.getYear() ); } }
if you had a abstract method in the abstract class then you would force the Girl class to include the method.

public abstract class Human{ int _years; String _name; public Human( int y , String name ){ this._years = y; this._name = name; } public int getYear(){ return this._years; } public abstract String getName(); } } public class Girl extends Human{ int y; String n; public Girl( int y, String n ){ super( y , n ); this.y = y; this.n = n; } public int getYear(){ return this.y; } public static void main( String args[] ){ Girl g = new Girl( 2 , "Little John" ); System.out.println( g.getYear() ); } }
Here you would have a compile error because the Girl class didn't include the getName method. It's up to the Girl class to supply the implementation of the getName() method.
Hope this make sence. There are probably experienced java programmers that would explain this more clearly.
// Mathias

Just so you know!
Please read this before using LAST_INSERT_ID

Nope! You can use javac myApplet.java -target 1.1
// Mathias

Ok! I've managed to open a new window from java without a toolbar.
First! Add netscape.javascript to your classpath. If you are using jdk1.4
then you can reference jdk1.4\jre\lib\jaws.jar. It contains the netscape package.
when this is done you create your html file. Dont forget to add the element
MAYSCRIPT to your applet description.
Se example. ( HTML file that contains the applet )
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Falling Blocks 1.0</title> </head> <body> <Script Language="JavaScript"> function openNewWindow( URL , Name , Width , Height , Top , Left ){ window.open( URL ,Name ,'toolbar=no,location=no,directories=no,status=no,scrollbars=no,resizable=no,copyhistory=no,width='+ Width +',height='+ Height +',top=' + Top + ',left=' + Left ); } </Script> <applet code="Test.class" width="300" height="320" MAYSCRIPT> </applet> </body> </html>
And here is our Test class.
import java.applet.Applet; import netscape.javascript.*; public class Test extends Applet{ public void init() { JSObject win = (JSObject) JSObject.getWindow(this); String [] stringArgs = new String[6]; stringArgs[0] = "test2.html"; stringArgs[1] = "Name"; stringArgs[2] = "300"; stringArgs[3] = "300"; stringArgs[4] = "300"; stringArgs[5] = "300"; win.call("openNewWindow", stringArgs ); } }
Try it out. Pretty cool

It seems to me that you can use the
netscape.javascript.*; package. It enables opening a new window from
an Applet without the toolbar. Search google for this.
here is a good page on the matter
// Mathias
[ April 14, 2004: Message edited by: Mathias Nilsson ]

Hi!
If I understand you right you have a window that contains a applet. From that window would you like to open another window and close the parent window.
If you shall open a new window without toolbar etc from the applet then i don't know, but if you click a link in the document containg the applet then you can do it with javascript. When the new window opens you can close the parent window.
// First html page with the applet
<!DOCTYPE html> <HTML> <HEAD> </HEAD> <Script Language="JavaScript"> function openNewWindow( URL , Name , Width , Height , Top , Left ){ window.open( URL ,Name ,'toolbar=no,location=no,directories=no,status=no,scrollbars=no,resizable=no,copyhistory=no,width='+ Width +',height='+ Height +',top=' + Top + ',left=' + Left ); } </Script> <BODY> <P> <APPLET code="DisclaimerApplet.class" codebase="./" width="700" height="450"> </APPLET> // New Code <a href="javascript :-o penNewWindow( 'newpage.html' , 'new' , 300 , 300 , 300 , 300 );">Open new window</a> </BODY> </HTML>
When you have pressed the link and the other window opens
<HTML> <HEAD> <SCRIPT language="JavaScript" type="text/JavaScript"><!-- opener.opener = opener; opener.close(); //--> </SCRIPT> </HEAD> <BODY leftmargin="0" topmargin="0" marginwidth="0" marginheight="0"> New Window </BODY> </HTML>

Hello!
I have a question on the graphics object!
I'm trying to make my first java game and just wonder.
Do I have to use the same graphics object that is passed to the paint() method in the applet? If I use another graphicsobject in another class then
It doesn't paint anything on the applet. It's just that it is very annoying
to pass the Graphics object to every other method.
Is there anybody who can tip me on what is good programming? I want
to have a paint method in another class so that the class can handle it's own painting.
// Mathias

I didn't mean that you should put the code snippet in your class file. Rather in your html document that holds the applet attribut.
// Mathias

Yes! Thanks... I did that..
Is there a diffrence in performance on
Vector.add(); java 1.2
Vector.addElement(); java 1.1
Does the browsers support 1.2 or just 1.1?
// Mathias

ok! I Saw that ArrayList is java 1.2.
What type of collection do you recommend to store arrays of objects
in? I want the fastest one if it is possible.
// Mathias

Hi all!
I'm having a hard time getting my falling block applet game to work.
First of all I have to compile my java files using -target 1.1.
When I use a class I've made to handle the squares in my game I get an error. It seams that I can't use ArrayList?
Does anyone have a solution to this problem?
Here is my Grid class. Why can't I use this in a applet.
import java.util.ArrayList; public class Grid extends Object{ private ArrayList squares = new ArrayList(); public Grid(){ for( int i = 0; i < FallingBlocksConstants.TOTAL_SQUARES_IN_GRID; i++ ){ squares.add( i , new Square() ); } } public boolean isRowEmpty( int i ){ if( FallingBlocksConstants.TOTAL_ROWS_IN_GRID >= i ){ for( int j = ( ( i * FallingBlocksConstants.TOTAL_SQUARES_IN_ROW ) - FallingBlocksConstants.TOTAL_SQUARES_IN_ROW ); j < ( ( ( i * FallingBlocksConstants.TOTAL_SQUARES_IN_ROW ) - FallingBlocksConstants.TOTAL_SQUARES_IN_ROW ) + FallingBlocksConstants.TOTAL_SQUARES_IN_ROW ); j++ ){ if( this.getSquare( j ).isOccupied() ){ return false; } } return true; }else{ return false; } } public boolean isRowFull( int i ){ if( FallingBlocksConstants.TOTAL_ROWS_IN_GRID >= i ){ for( int j = ( ( i * FallingBlocksConstants.TOTAL_SQUARES_IN_ROW ) - FallingBlocksConstants.TOTAL_SQUARES_IN_ROW ); j < ( ( ( i * FallingBlocksConstants.TOTAL_SQUARES_IN_ROW ) - FallingBlocksConstants.TOTAL_SQUARES_IN_ROW ) + FallingBlocksConstants.TOTAL_SQUARES_IN_ROW ); j++ ){ if( ! this.getSquare( j ).isOccupied() ){ return false; } } return true; }else{ return false; } } public Square getSquare( int n ){ if( FallingBlocksConstants.TOTAL_SQUARES_IN_GRID >= n ){ return ( Square ) squares.get( n ); }else{ return null; } } }
Applet error: error: java.lang.NoClassFoundDefError : java/util/ArrayList
When I dont use the Grid class in my Applet it works fine.
[ April 14, 2004: Message edited by: Mathias Nilsson ]