帮忙解释一下这些代码？
class PaintPanel extends JPanel{//定义一个PaintPanel类来输入信息// 创建一个具有指定标题和指定所有者对话框的无模式对话框
JDialog labHeiQi = new JDialog(new JFrame() ,"胜利",false);
//创建一个JLabel可以显示文本
//JLabel jbm1=new JLabel("★★★★★★★★★★★★★★★★★");
JLabel jb1=new JLabel("★★★★★恭喜，你赢了!！★★★★★");
JDialog labHongQi = new JDialog(new JFrame(),"失败",false);
//JLabel jbm2=new JLabel("★★★★★★★★★★★★★★★★");
JLabel jb2=new JLabel("★★★你输了，请继续努力！★★★");
public int [][]map;//定义一个二维数组来作为棋盘的方格
public int[]cp;
public int isSuccess=0;
ArrayList Items = new ArrayList();//构造一个初始容量为的空列表。
public PaintPanel() {
//布局
setLayout(new BorderLayout());//创建一个边界布局布置容器
ButtonPanel buttonPanel = new ButtonPanel();
add(buttonPanel, BorderLayout.SOUTH);//按钮的位置
addMouseListener(new MouseHandler());//向按钮添加一个 MouseHandler
map=new int [19][19];//棋盘作为十九行，十九列
for(int i=0;i<19;i++){
for(int j=0;j<19;j++){
map[i][j]=-1;
}
}
cp=new int [2];
cp[0]=-1;
cp[1]=-1;
}
public void lab(int k){
labHeiQi.setLayout(new BorderLayout());
labHeiQi.add("Center",jb1);
//labHeiQi.add("North",jbm1);
labHeiQi.pack();
labHongQi.setLayout(new BorderLayout());
labHongQi.add("Center",jb2);
//labHongQi.add("North",jbm2);
labHongQi.pack();
if(k==1){
labHeiQi.setVisible(true);
}
else{
if(k==2)
labHongQi.setVisible(true);
}
}
public void paintComponent(Graphics g) {
//此 Paint 接口定义如何为 Graphics2D 操作生成颜色模式
int startX = 50;
int startY = 50;
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
for(int i=0; i<19; i++) {
g2.draw(new Line2D.Double(startX, startY+20*i, startX+360, startY+20*i));
g2.draw(new Line2D.Double(startX+20*i, startY, startX+20*i, startY+360));
}
for(int i=0; i<Items.size(); i++) {
int k=(i+2)%2;
if(k==0){
g2.setColor(Color.BLACK);
if(isSuccess==1){
lab(1);
}
}
else{
g2.setColor(Color.RED);
if(isSuccess==2){
lab(2);
}
}
g2.fill((Ellipse2D)Items.get(i));
}
}
void myRepaint() {
repaint();
}
void reset(){
isSuccess=0;
for(int i=0;i<19;i++){
for(int j=0;j<19;j++){
map[i][j]=-1;
}
}
}
class MouseHandler extends MouseAdapter {
public void mousePressed(MouseEvent event) {
int x = event.getX();
int y = event.getY();
x=(x-50)/20;
y=(y-50)/20;
if(chessExist(x,y)&&isSuccess==0){
paintItem(x, y);
isSuccess=Success(x,y,1);
map[x][y]=1;
repaint();
if(isSuccess==0){
computer();
int q=cp[0];
int r=cp[1];
paintItem(q,r);
isSuccess=Success(q,r,2);
map[q][r]=2;
repaint();
}
}
}
public void paintItem(int x, int y) {
x=x*20+50;
y=y*20+50;
if(x >30 && x <430 && y >30 && y <430) {
int X = x / 20;
int Y = y / 20;
int centerX = X*20 + 10;
int centerY = Y*20 + 10;
Ellipse2D ellipse = new Ellipse2D.Double();
ellipse.setFrameFromCenter(centerX, centerY, centerX+8, centerY+8);
Items.add(ellipse);
}
}
public void computer(){ //计算机走棋
int maxblack,maxHong,maxtemp,max=0;
for(int i=1;i<18;i++){
for(int j=1;j<18;j++){
if(chessExist(i,j)){//判断是否可以下子
maxblack=CheckMax(i,j,1);
maxHong=CheckMax(i,j,2);
maxtemp=Math.max(maxblack,maxHong);
if(maxtemp>max){
max=maxtemp;
cp[0]=i;
cp[1]=j;
}
}
}
}
}
public int CheckMax(int x,int y,int person){//判断某一点四个方向上棋子的最大值
int maxnum=0;
int up,down,left,right;
left=right=x;
up=down=y;
do{
up++;
}
while(up>=0&&map[x][up]==person);
do{
down--;
}
while(down<19&&map[x][down]==person);
if((up-down)>maxnum){
maxnum=up-down;
}
int align;
do{
right++;
}
while(right<19&&map[align=right][y]==person);
do{
left--;
}
while(left>=0&&map[align=left][y]==person);
if((right-left)>maxnum){
maxnum=right-left;
}
left=right=x;
down=up=y;
do{
right++;
down++;
}
while(right<19&&down<19&&map[align=right][down]==person);
do{
left--;
up--;
}
while(left>=0&&up>=0&&map[align=left][up]==person);
if((right-left)>maxnum){
maxnum=right-left;
}
left=right=x;
down=up=y;
do{
right++;
down--;
}
while(right<19&&down>=0&&map[align=right][down]==person);
do{
left--;
up++;
}
while(left>=0&&up<19&&map[align=left][up]==person);
if((right-left)>maxnum){
maxnum=right-left;
}
return maxnum;
}
public int Success(int x,int y,int person){ //判断胜负
int up,down,left,right;
left=right=x;
up=down=y;
do{
up++;
}
while(up>=0&&map[x][up]==person);
do{
down--;
}
while(down<19&&map[x][down]==person);
if((up-down)>5){
return person;
}
else{
int align;
do{
right++;
}
while(right<19&&map[align=right][y]==person);
do{
left--;
}
while(left>=0&&map[align=left][y]==person);
if((right-left)>5){
return person;
}
else{
left=right=x;
down=up=y;
do{
right++;
down++;
}
while(right<19&&down<19&&map[align=right][down]==person);
do{
left--;
up--;
}
while(left>=0&&up>=0&&map[align=left][up]==person);
if((right-left)>5){
return person;
}
else{
left=right=x;
down=up=y;
do{
right++;
down--;
}
while(right<19&&down>=0&&map[align=right][down]==person);
do{
left--;
up++;
}
while(left>=0&&up<19&&map[align=left][up]==person);
if((right-left)>5){
return person;
}
else{
return 0;
}
}
}
}
}
public boolean chessExist(int i,int j){//判断该格是否有棋子
if(map[i][j]==-1)
return true;
else
return false;
}
}
class ButtonPanel extends JPanel{
public ButtonPanel() {
JButton reset = new JButton("新游戏");
add(reset);
JButton quit = new JButton("退出");
add(quit);
ResetEvent listenerR = new ResetEvent();
reset.addMouseListener(listenerR);
QuitEvent listenerQ = new QuitEvent();
quit.addMouseListener(listenerQ);
}
class QuitEvent extends MouseAdapter {//离开游戏
public void mouseClicked(MouseEvent event) {
System.exit(1);
}
}
class ResetEvent extends MouseAdapter { //重新开始游戏
public void mouseClicked(MouseEvent event) {
Items.clear();
myRepaint();
reset();
}
}
}
}
/* class GameFrame extends JFrame {
public GameFrame() {
setTitle("五子棋");
setSize(500, 600);
setResizable(false);
PaintPanel panel = new PaintPanel();
getContentPane().add(panel);
}
//public class Game {
public static void main(String[] args) {
GameFrame frame = new GameFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.show();
}
