introduction oracle 9i

import java.awt.*; import java.applet.*; import java.awt.event.*; import java.awt.image.*; import java.awt.geom.*; import java.util.Random; class WaterObject extends Thread{ static final int LEFT=0; static final int RIGHT=1; static final int UP=2; static final int DOWN=3; Image img; int speed; int x, y; int direction; WaterObject(){} WaterObject(Image img, int x, int y, int direction){ this.img=img; this.x=x;this.y=y; this.direction=direction; } void setSpeed(int speed){ this.speed=speed; } int getSpeed(){ return speed; } void setDirection(int direct){ this.direction=direct; } void draw(Graphics g, ImageObserver observer){ g.drawImage(img, x, y, observer); } void move(){ switch(direction){ case LEFT: x-=speed; break; case RIGHT: x+=speed; break; case UP: y-=speed; break; case DOWN: y+=speed; break; } } } class WaterBomb extends WaterObject{ Image imgExp; WaterUnit owner; boolean explosion=false; boolean loop=true; WaterBomb(Image img, Image imgExp, int x, int y, int direct, WaterUnit owner){ super(img, x, y, direct); this.imgExp=imgExp; this.owner=owner; setSpeed(3); } boolean intersects(WaterUnit ob){ Rectangle2D rect=new Rectangle(x, y, img.getWidth(null), img.getHeight(null)); int obW=ob.img.getWidth(null), obH=ob.img.getHeight(null); return rect.intersects(ob.x+4, ob.y+5, obW-10, obH-10); } void draw(Graphics g, ImageObserver observer){ if(explosion) g.drawImage(imgExp, x-10, y-10, observer); else super.draw(g, observer); } void check(){ WaterUnit[] target=owner.getEnemys(); for(int i=0;i<target.length;i++) if(intersects(target[i])){ explosion=true; if(owner instanceof WarShip){ WarShip ship=(WarShip)owner; ship.addKillCount(); } loop=false; target[i].damage(1); } } public void run(){ while(loop){ if(direction==DOWN && y>=290)loop=false; else if(direction==UP && y<100)loop=false; check(); move(); try{sleep(100);}catch(Exception e){} } } } class WaterUnit extends WaterObject{ int life=1; Image imgLeft; Image imgBomb, imgExp; WaterBomb[] bomb; WaterUnit[] enemy; int bombX, bombY; int bCount=1; WaterUnit(){} WaterUnit(Image img, Image imgLeft, int x, int y, int direct, Image imgBomb, Image imgExp){ super(img, x, y, direct); this.imgLeft=imgLeft; this.imgBomb=imgBomb; this.imgExp=imgExp; bomb=new WaterBomb[50]; bombX=23; bombY=15; } void damage(int dam){ life-=dam; } void setBombCount(int n){ bCount=n; } int getBombCount(){ return bCount; } void setLife(int life){ this.life=life; } int getLife(){ return life; } void setEnemys(WaterUnit[] enemy){ this.enemy=enemy; } WaterUnit[] getEnemys(){ return enemy; } void fireBomb(int direct){ for(int i=0;i<bCount;i++) if(bomb[i]==null || !bomb[i].isAlive()){ bomb[i]=new WaterBomb(imgBomb, imgExp, x+bombX, y+bombY, direct, this); bomb[i].start(); break; } } void draw(Graphics g, ImageObserver observer){ if(direction==RIGHT) g.drawImage(img, x, y, observer); else if(direction==LEFT) g.drawImage(imgLeft, x, y, observer); for(int i=0;i<bCount;i++) if(bomb[i]!=null && bomb[i].isAlive()) bomb[i].draw(g, observer); } } class WarShip extends WaterUnit{ boolean keyLeft=false; boolean keyRight=false; int kills=0; WarShip(Image img, Image imgLeft, int x, int y, int direct, Image imgBomb, Image imgExp){ super(img, imgLeft, x, y, direct, imgBomb, imgExp); setBombCount(3); setLife(10);setSpeed(5); } void addKillCount(){ kills++; } void setKey(int keyCode, boolean pressed){ if(keyCode==KeyEvent.VK_LEFT) keyLeft=pressed; if(keyCode==KeyEvent.VK_RIGHT) keyRight=pressed; if((keyCode==KeyEvent.VK_DOWN || keyCode==KeyEvent.VK_SPACE) && pressed) fireBomb(DOWN); } void drawScore(Graphics2D g){ g.setPaint(Color.blue); g.drawString("Life: "+String.valueOf(getLife()), 10, 15); g.setPaint(Color.red); g.drawString("Kills: "+String.valueOf(kills), 10, 25); g.setPaint(Color.green); g.drawString("Bombs: "+String.valueOf(getBombCount()), 10, 35); } public void run(){ while(true){ if(keyLeft){ direction=LEFT; move(); } if(keyRight){ direction=RIGHT; move(); } try{sleep(70);}catch(Exception e){} } } } class Submarine extends WaterUnit{ int[] firePoint=new int[50]; static Random rnd=new Random(); Submarine(Image img, Image imgLeft, int x, int y, int direct, Image imgBomb, Image imgExp){ super(img, imgLeft, x, y, direct, imgBomb, imgExp); randomPosition(); setBombCount(5); setSpeed(5); } public void randomPosition(){ y=rnd.nextInt(120)+130; if(direction==RIGHT) x=-rnd.nextInt(200)-50; else x=rnd.nextInt(300)+300; for(int i=0; i<getBombCount();i++){ firePoint[i]=rnd.nextInt(290); } } public void move(){ for(int i=0; i<getBombCount();i++){ if(x<=firePoint[i] && x+speed>firePoint[i]){ fireBomb(UP); break; } } if(direction==RIGHT && x>310){ direction=LEFT; randomPosition(); } else if( direction==LEFT && x < -80){ direction=RIGHT; randomPosition(); } super.move(); } public void run(){ while(true){ if(getLife()<=0){setLife(1);randomPosition();} move(); try{sleep(200);}catch(Exception e){} } } } public class WaterWar extends Applet implements KeyListener, Runnable{ Image buff, imgLand; Canvas screen; Graphics2D gs, gb; WarShip ship; Submarine[] submarine=new Submarine[10]; boolean running=false; Button bStart; Thread game; public void init(){ prepareResource(); setBackground(Color.yellow); initScreen(); add(screen); bStart=new Button("게임 시작"); add(bStart); bStart.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent ae){ screen.requestFocus(); if(running==true)return; running=true; game.start(); ship.start(); for(int i=0;i<submarine.length;i++) submarine[i].start(); } }); } public void prepareResource(){ imgLand=getImage(getCodeBase(),"images/land.gif"); Image imgShipRight=getImage(getCodeBase(),"images/ship1.gif"); Image imgShipLeft=getImage(getCodeBase(),"images/ship2.gif"); Image imgDepthBomb=getImage(getCodeBase(),"images/depthbomb.gif"); Image imgSubRight=getImage(getCodeBase(),"images/submarine1.gif"); Image imgSubLeft=getImage(getCodeBase(),"images/submarine2.gif"); Image imgExp=getImage(getCodeBase(),"images/pung.gif"); Image imgTorpedo=getImage(getCodeBase(),"images/torpedo.gif"); MediaTracker mt=new MediaTracker(this); mt.addImage(imgLand,0); mt.addImage(imgShipRight,1); mt.addImage(imgShip