Java swing图形绘制并用颜色填充选定的矩形

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/**  * @Title:  * @Description:TODO  * @Company:HF  * @ClassName:Exam.java    * @Author:wushigao  * @CreateDate:2022年11月29日上午10:39:55  * @UpdateUser:wushigao  * @UpdateDate:2022年11月29日 上午10:39:55  * @Version:1.0  */ import java.awt.AlphaComposite; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Container; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Point; import java.awt.Rectangle; import java.awt.Stroke; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; import java.util.ArrayList;   import javax.swing.JFrame; import javax.swing.JPanel; public class Exam extends JPanel implements MouseMotionListener {       private static final int recW = 50;     private static final int MAX = 100;     private Rectangle[] rect = new Rectangle[MAX];     private int numOfRecs = 0;     private int currentSquareIndex = -1;     private Point startPoint = new Point();     private Point currentPoint = new Point();     private int x, y, width, height;     private Stroke dashedStroke = new BasicStroke(0.0f, BasicStroke.CAP_ROUND,             BasicStroke.CAP_SQUARE, 5.0f, new float[] { 5f, 5f, 5f, 5f }, 5.0f);       ArrayList list = new ArrayList();       public Exam() {           addRect(50, 50);         addRect(100, 50);         addRect(150, 50);         addRect(200, 50);         addRect(250, 50);         addRect(300, 50);         addRect(350, 50);         addRect(400, 50);         addRect(450, 50);         addRect(500, 50);         //         addRect(50, 100);         addRect(100, 100);         addRect(150, 100);         addRect(200, 100);         addRect(250, 100);         addRect(300, 100);         addRect(350, 100);         addRect(400, 100);         addRect(450, 100);         addRect(500, 100);         //         addRect(50, 150);         addRect(100, 150);         addRect(150, 150);         addRect(200, 150);         addRect(250, 150);         addRect(300, 150);         addRect(350, 150);         addRect(400, 150);         addRect(450, 150);         addRect(500, 150);         //         addRect(50, 200);         addRect(100, 200);         addRect(150, 200);         addRect(200, 200);         addRect(250, 200);         addRect(300, 200);         addRect(350, 200);         addRect(400, 200);         addRect(450, 200);         addRect(500, 200);           addMouseListener(new MouseAdapter() {               @Override             public void mousePressed(MouseEvent evt) {                 startPoint = evt.getPoint();             }               public void mouseReleased(MouseEvent e) {                   System.out.println(" mouseReleased is" + e.getX() +" y i s"                         + e.getY());                 Graphics g = getGraphics();                 Graphics2D g2 = (Graphics2D) g;                 g2.setComposite(AlphaComposite.SrcOver.derive(0.8f));                 Color myColour = new Color(255, 0, 0);                 g.setColor(myColour);                 x = Math.min(startPoint.x, currentPoint.x);                 y = Math.min(startPoint.y, currentPoint.y);                 width = Math.abs(startPoint.x - currentPoint.x);                 height = Math.abs(startPoint.y - currentPoint.y);                 rect[numOfRecs] = new Rectangle(x, y, width, height);                 // System.out.println("list size is:"+list.size());                  Rectangle ggg=new Rectangle(x, y, width, height);             for(Rectangle rect3d: rect){                 if(ggg.intersects(rect3d)){                 g2.fill(rect3d);                 }                 else                     System.out.println("doesn't contains");                 } repaint();             }           });           addMouseMotionListener(this);     }       @Override     public void paintComponent(Graphics g) {         super.paintComponent(g);         for (int i = 0; i < numOfRecs; i++) {             ((Graphics2D) g).draw(rect[i]);             list.add(rect[i]);         }           x = Math.min(startPoint.x, currentPoint.x);         y = Math.min(startPoint.y, currentPoint.y);         width = Math.abs(startPoint.x - currentPoint.x);         height = Math.abs(startPoint.y - currentPoint.y);         ((Graphics2D) g).setStroke(dashedStroke);         g.setColor(Color.BLACK);         g.drawRect(x, y, width, height);         // Rectangle dashedRec=new Rectangle(x, y, width, height);       }       public void addRect(int x, int y) {         if (numOfRecs < MAX) {             rect[numOfRecs] = new Rectangle(x, y, recW, recW);             currentSquareIndex = numOfRecs;             numOfRecs++;             repaint();         }     }       @Override     public void mouseMoved(MouseEvent event) {     }       @Override     public void mouseDragged(MouseEvent event) {           currentPoint = event.getPoint();         repaint();     }       public static void main(String[] args) {         JFrame jFrame = new JFrame();         jFrame.setTitle("");         jFrame.setSize(600, 300);         Container cPane = jFrame.getContentPane();         cPane.add(new Exam());         jFrame.setVisible(true);     } }