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Всем доброе время суток! Читаю книгу Буткевича, примеры приведены но код не всегда подробен, например какие классы импортировать и остальное по мелочам. И на одном примере ступор. Простая змейка, просто передвижение. но приложение не запускается. Надеюсь поможете разобраться! Вот код: | Код |
package snake;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.Display;
public class Enter extends MIDlet {
private Display display;
public void startApp() {
Snake snake = new Snake();
display = Display.getDisplay(this);
display.setCurrent(snake);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
}
package snake;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.Graphics;
import java.io.*;
import java.util.Vector;
public class Snake extends Canvas {
private int HEAD = 0;
private int TAIL = 1;
private int BODY = 2;
private int ACLOCKWISE_TURN = 3;
private int CLOCKWISE_TURN = 4;
private int UP = 0;
private int LEFT = 1;
private int RIGHT = 2;
private int DOWN = 3;
private int direction;
private Vector snake;
private int width;
private int height;
private int xHead;
private int yHead;
private Image[] images;
private int imageSize;
private boolean gameOverFlag;
public Snake () {
super();
images = new Image[20];
try {
// голова во всех направлениях
images[0] = Image.createImage("/headUp.png");
images[1] = Image.createImage("/headLeft.png");
images[2] = Image.createImage("/headRight.png");
images[3] = Image.createImage("/headDown.png");
// хвост во всех напрвлениях
images[4] = Image.createImage("/tailUp.png");
images[5] = Image.createImage("/tailLeft.png");
images[6] = Image.createImage("/tailRight.png");
images[7] = Image.createImage("/tailDown.png");
// тело
images[8] = Image.createImage("/bodyUp.png");
images[9] = Image.createImage("/bodyLeft.png");
images[10] = images[8];
images[11] = images[9];
// сгиб тела против часовой стрелке
images[12] = Image.createImage("/turnDownLeft.png");
images[13] = Image.createImage("/turnUpLeft.png");
images[14] = Image.createImage("/turnDownRight.png");
images[15] = Image.createImage("/turnUpRight.png");
// сгиб по часовой стрелке
images[16] = images[14];
images[17] = images[12];
images[18] = images[15];
images[19] = images[13];
}
catch(IOException ioe) {}
imageSize = images[0].getWidth();
snake = new Vector();
width = getWidth();
height = getHeight();
xHead = ((width/2)/imageSize)*imageSize;
yHead = ((height/2)/imageSize)*imageSize;
SnakePart partS = new SnakePart(xHead, yHead, HEAD, UP);
snake.addElement(partS);
partS = new SnakePart(xHead, yHead+2*imageSize, TAIL, UP);
snake.addElement(partS);
direction = UP;
gameOverFlag = false;
}
public void paint (Graphics g) {
g.setColor(0xFFFFFFF);
g.fillRect(0,0,width,height);
g.setColor(0x000000);
g.drawRect(1,1,width-3, height-3);
int snakeLen = snake.size();
if(gameOverFlag) {
g.drawString("Game Over", width/2, height/2-10, g.HCENTER|g.TOP);
String score = new String ("YOUR CODE: "+snakeLen);
g.drawString(score, width/2, height/2+10, g.HCENTER|g.TOP);
return;
}
else {
for(int i=0; i<snakeLen; i++) {
g.drawImage(
images[4*((SnakePart)snake.elementAt(i)).getPart()+((SnakePart)snake.elementAt(i)).getDir()],
((SnakePart)snake.elementAt(i)).getX(),
((SnakePart)snake.elementAt(i)).getY(),
g.HCENTER|g.VCENTER);
}
}
}
public void keyPressed(int keyCode) {
if(!gameOverFlag) {
switch(keyCode) {
case KEY_NUM2:
checkMove(xHead, yHead-imageSize);
moveUp();
break;
case KEY_NUM4:
checkMove(xHead-imageSize, yHead);
moveLeft();
break;
case KEY_NUM6:
checkMove(xHead+imageSize, yHead);
moveRight();
break;
case KEY_NUM8:
checkMove(xHead, yHead+imageSize);
moveDown();
break;
}
repaint();
}
}
public void checkMove(int xH, int yH) {
for(int i = 3; i<snake.size() - 1; i++) {
if(xH == ((SnakePart)(snake.elementAt(i))).getX() && yH==((SnakePart)(snake.elementAt(i))).getY())
gameOverFlag = true;
}
}
public void moveLeft() {
if(direction != RIGHT) {
xHead-=imageSize;
if(xHead<4) {gameOverFlag = true; return;}
SnakePart head = (SnakePart)(snake.firstElement());
if(direction == UP) {
head.setPartDir(ACLOCKWISE_TURN,LEFT);
}
else {
if(direction == DOWN) {
head.setPartDir(CLOCKWISE_TURN,LEFT);
}
else {
head.setPartDir(BODY,LEFT);
}
}
SnakePart sPart = new SnakePart(xHead,yHead,HEAD,LEFT);
snake.insertElementAt(sPart,0);
snake.removeElement(snake.lastElement());
((SnakePart)snake.lastElement()).setPartDir(TAIL, -1);
direction = LEFT;
}
}
public void moveUp() {
if(direction != DOWN) {
yHead-=imageSize;
if(yHead<4) {gameOverFlag = true; return;}
SnakePart head = (SnakePart)(snake.firstElement());
if(direction == LEFT) {
head.setPartDir(CLOCKWISE_TURN,UP);
}
else {
if(direction == RIGHT) {
head.setPartDir(ACLOCKWISE_TURN,UP);
}
else {
head.setPartDir(BODY,UP);
}
}
SnakePart sPart = new SnakePart(xHead,yHead,HEAD,UP);
snake.insertElementAt(sPart,0);
snake.removeElement(snake.lastElement());
((SnakePart)snake.lastElement()).setPartDir(TAIL, -1);
direction = UP;
}
}
public void moveDown() {
if(direction != UP) {
yHead+=imageSize;
if(yHead>4) {gameOverFlag = true; return;}
SnakePart head = (SnakePart)(snake.firstElement());
if(direction == LEFT) {
head.setPartDir(ACLOCKWISE_TURN,DOWN);
}
else {
if(direction == RIGHT) {
head.setPartDir(CLOCKWISE_TURN,DOWN);
}
else {
head.setPartDir(BODY,UP);
}
}
SnakePart sPart = new SnakePart(xHead,yHead,HEAD,DOWN);
snake.insertElementAt(sPart,0);
snake.removeElement(snake.lastElement());
((SnakePart)snake.lastElement()).setPartDir(TAIL, -1);
direction = DOWN;
}
}
public void moveRight() {
if(direction != LEFT) {
xHead+=imageSize;
if(xHead>4) {gameOverFlag = true; return;}
SnakePart head = (SnakePart)(snake.firstElement());
if(direction == UP) {
head.setPartDir(ACLOCKWISE_TURN,RIGHT);
}
else {
if(direction == DOWN) {
head.setPartDir(CLOCKWISE_TURN,RIGHT);
}
else {
head.setPartDir(BODY,UP);
}
}
SnakePart sPart = new SnakePart(xHead,yHead,HEAD,RIGHT);
snake.insertElementAt(sPart,0);
snake.removeElement(snake.lastElement());
((SnakePart)snake.lastElement()).setPartDir(TAIL, -1);
direction = RIGHT;
}
}
}
package snake;
public class SnakePart extends Object {
private int x;
private int y;
private int part;
private int dir;
public SnakePart(int _x, int _y, int _part, int _dir ) {
x = _x;
y = _y;
part = _part;
dir = _dir;
}
public int getPart() {return part;}
public int getDir() {return dir;}
public int getX() {return x;}
public int getY() {return y;}
public void setPartDir(int _part, int _dir ) {
part = _part;
if(_dir != 0) dir = _dir;
}
}
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Не запускается приложение. Но и ошибок нет. Пример из книги! 
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