java繪制五子棋棋盤

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class Demo extends JFrame {

 //背景圖片
 BufferedImage image;

 {
  try {
   image = ImageIO.read(new File("forGame\\src\\resource\\主題背景.jpg"));
  } catch (IOException e) {
   e.printStackTrace();
  }
 }

 //創建畫板內部類
 class myJPanel extends JPanel{
  //繪制方法
  @Override
  public void paint(Graphics g) {
   //強制類型轉換得到Graphics子類Graphics2D對象
   Graphics2D g2 = (Graphics2D)g;//又得到一支筆
   //先JPanel繪制背景圖片
   g2.drawImage(image,0,0,1600,900,null);
   //設置畫筆顏色
   g2.setColor(Color.CYAN);
   //填充規定區域
   g2.fill3DRect(50, 50, 700, 700, true);

   //再設置畫筆顏色，畫直線
   g2.setColor(Color.black);
   //設置畫出直線的寬度
   g2.setStroke(new BasicStroke(3));

   //繪制下棋區域
   for(int i = 1;i < 16;i ++) {
    g2.drawLine(50,50*i,750,50*i );
   }
   for(int i = 1;i < 16;i ++) {
    g2.drawLine(50*i,50,50*i,750 );
   }

   //畫外框
   //設置畫筆寬度
   g2.setStroke(new BasicStroke(5));
   g2.drawLine(25,25,775, 25);
   g2.drawLine(25,775,775, 775);
   g2.drawLine(25,25,25, 775);
   g2.drawLine(775,25,775, 775);

   //畫四個黑色圓
   g2.fillOval(240, 240, 20, 20);
   g2.fillOval(540, 240, 20, 20);
   g2.fillOval(240, 540, 20, 20);
   g2.fillOval(540, 540, 20, 20);

   //填充框框與下棋區域之間的區域
   g2.setColor(new Color(176, 166, 100, 254));//設置畫筆顏色
   g2.fillRect(26, 26, 749, 23);
   g2.fillRect(26, 49, 23, 725);
   g2.fillRect(49, 752, 725, 23);
   g2.fillRect(752, 49, 23, 703);
  }
 }


 //組裝窗體
 public void init(){
  //創建畫佈
  myJPanel canvas =new myJPanel();
  //添加畫板
  add(canvas);
  //改變圖標
  setIconImage(new ImageIcon("forGame\\src\\resource\\白棋.png").getImage());
  //窗體不可變
  setResizable(false);
  //窗體可關閉
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  //設置窗體大小
  setBounds(0,0,1600,900);
  //窗體顯示
  setVisible(true);
 }


 public static void main(String[] args) {
  new Demo().init();
 }
}