// Copyright 2003 Nokia Corporation.//// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE// OR TRADE PRACTICE, RELATING TO THE SOURCE CODE OR ANY WARRANTY OTHERWISE// ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE AND WITH NO// OBLIGATION OF NOKIA TO PROVIDE THE LICENSEE WITH ANY MAINTENANCE OR// SUPPORT. FURTHERMORE, NOKIA MAKES NO WARRANTY THAT EXERCISE OF THE// RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED// BY THIRD PARTIES//// Furthermore, information provided in this source code is preliminary,// and may be changed substantially prior to final release. Nokia Corporation// retains the right to make changes to this source code at// any time, without notice. This source code is provided for informational// purposes only.//// Nokia and Nokia Connecting People are registered trademarks of Nokia// Corporation.// Java and all Java-based marks are trademarks or registered trademarks of// Sun Microsystems, Inc.// Other product and company names mentioned herein may be trademarks or// trade names of their respective owners.//// A non-exclusive, non-transferable, worldwide, limited license is hereby// granted to the Licensee to download, print, reproduce and modify the// source code. The licensee has the right to market, sell, distribute and// make available the source code in original or modified form only when// incorporated into the programs developed by the Licensee. No other// license, express or implied, by estoppel or otherwise, to any other// intellectual property rights is granted herein.import javax.microedition.lcdui.*;// A class that represents a Bullet object. The Base generates bullets.// Bullets are ListItem's kept in a doubly linked list, so they can// be easily removed when they become inactive.class Bullet    extends ListItem{    private final int xMax;    private final int y;    private final int dx;    private final int w;    private final int h;    private int x;    private boolean isActive;    Bullet(int xMin, int xMax, int y, int w, int h, int dx)    {        this.xMax = xMax;        this.x = xMin;        this.y = y;        this.w = w;        this.h = h;        this.dx = dx;        isActive = true;    }    void tick()    {        if (isActive)        {            if ((x + dx) <= xMax)            {                x += dx; // move            }            else            {                 // flew off-screen: false means the bullet is 'dead'                isActive = false;            }        }    }    void draw(Graphics g)    {        if (isActive)        {            g.setColor(Base.COLOR);            g.fillRect(x, y, w, h);        }    }    void doExplode()    {        isActive = false;    }    int getX()    {        return x;    }    int getY()    {        return y;    }    int getWidth()    {        return w;    }    int getHeight()    {        return h;    }    // Active bullets participate in the game, inactive ones do not.    // Inactive bullets are removed by the game manager.    boolean isActive()    {        return isActive;    }}