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要实现画图板功能，可以使用Java的Swing库来创建一个简单的绘图应用。以下是一个基本的示例代码，用于实现画图板功能：
import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; public class DrawingBoard extends JFrame { private int startX, startY, endX, endY; private Color currentColor = Color.BLACK; public DrawingBoard() { setTitle("Drawing Board"); setSize(800, 600); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel controlPanel = new JPanel(); JButton redButton = new JButton("Red"); redButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { currentColor = Color.RED; } }); JButton blackButton = new JButton("Black"); blackButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { currentColor = Color.BLACK; } }); controlPanel.add(redButton); controlPanel.add(blackButton); JPanel drawingPanel = new JPanel() { @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(currentColor); g.drawLine(startX, startY, endX, endY); } }; drawingPanel.addMouseListener(new MouseAdapter() { @Override public void mousePressed(MouseEvent e) { startX = e.getX(); startY = e.getY(); } @Override public void mouseReleased(MouseEvent e) { endX = e.getX(); endY = e.getY(); drawingPanel.repaint(); } }); getContentPane().add(controlPanel, BorderLayout.NORTH); getContentPane().add(drawingPanel, BorderLayout.CENTER); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { DrawingBoard drawingBoard = new DrawingBoard(); drawingBoard.setVisible(true); } }); } } 此代码创建了一个简单的绘图板应用程序，用户可以在画板上绘制直线，并可以选择绘制的颜色。用户可以使用鼠标按下并拖动来绘制线条。您可以根据需要扩展此示例代码，以实现更复杂的绘图功能，如绘制不同形状、使用不同的画笔风格等。
