我在您的代码中看到了一些问题：
您正在扩展Jframe，您不应该这样做，因为可以将其读DrawShapesGUI 为a Jframe，Jframe是一个刚性容器，而是基于JPanels创建您的GUI 。有关更多信息，请参见使用Exting vs在类内部调用Java Swing。
您有一个称为的成员，figureID但您从未使用过它，因为每次figureID在每个“ ActionPerformed”方法中创建一个新的局部变量时：
int figureID = 5;
int从每个句子中删除，可能这就是为什么什么都没发生的问题。
您正在覆盖paint()方法，而应该覆盖paintComponent()。但是，我必须祝贺你至少打来电话super.paint(g)。
根本不是问题，但是一种改进是使用Shapes API绘制形状而不是调用g.drawLine()和所有这些调用。
您正在使用java.awt.EventQueue.invokeLater()应将Java 1.3版本更改为SwingUtilities.invokeLater()（再次改进）
ActionListener仅使用其中的一种方法和条件，就可以以更好的方式改进s。
考虑到以上几点，我制作了一个新程序，该程序产生以下输出：
import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Polygon;import java.awt.Shape;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.geom.Arc2D;import java.awt.geom.Ellipse2D;import java.awt.geom.Line2D;import java.awt.geom.Rectangle2D;import javax.swing.ButtonGroup;import javax.swing.Jframe;import javax.swing.JPanel;import javax.swing.JRadioButton;import javax.swing.SwingUtilities;@SuppressWarnings("serial")public class DrawShapesGUI { private Jframe frame; private JRadioButton lineButton; private JRadioButton rectButton; private JRadioButton ovalButton; private JRadioButton arcButton; private JRadioButton polygonButton; private ButtonGroup group; private JPanel pane; private CustomShape renderShape; private Shape shape; private ActionListener listener = new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if (e.getSource().equals(lineButton)) { shape = new Line2D.Double(50, 50, 100, 100); renderShape.setShape(shape); } else if (e.getSource().equals(rectButton)) { shape = new Rectangle2D.Double(50, 50, 100, 100); renderShape.setShape(shape); } else if (e.getSource().equals(ovalButton)) { shape = new Ellipse2D.Double(100, 100, 100, 60); renderShape.setShape(shape); } else if (e.getSource().equals(arcButton)) { shape = new Arc2D.Double(50, 50, 200, 200, 90, 30, Arc2D.OPEN); renderShape.setShape(shape); } else if (e.getSource().equals(polygonButton)) { Polygon poly = new Polygon(); poly.addPoint(100, 50); poly.addPoint(150, 50); poly.addPoint(200, 100); poly.addPoint(150, 150); poly.addPoint(100, 150); poly.addPoint(50, 100); shape = poly; renderShape.setShape(shape); } } }; public static void main(String args[]) { try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(DrawShapesGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(DrawShapesGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(DrawShapesGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(DrawShapesGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } SwingUtilities.invokeLater(new Runnable() { public void run() { new DrawShapesGUI().createAndShowGUI(); } }); } class CustomShape extends JPanel { private Shape shape; public Shape getShape() { return shape; } public void setShape(Shape shape) { this.shape = shape; revalidate(); repaint(); } @Override public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g.create(); if (shape != null) { g2d.setColor(Color.RED); if (shape instanceof Line2D || shape instanceof Arc2D) { g2d.draw(shape); } else { g2d.fill(shape); } } } @Override public Dimension getPreferredSize() { return new Dimension(150, 200); } } public void createAndShowGUI() { frame = new Jframe(getClass().getSimpleName()); lineButton = new JRadioButton("Line"); rectButton = new JRadioButton("Rectangle"); ovalButton = new JRadioButton("Oval"); arcButton = new JRadioButton("Arc"); polygonButton = new JRadioButton("Polygon"); lineButton.addActionListener(listener); rectButton.addActionListener(listener); ovalButton.addActionListener(listener); arcButton.addActionListener(listener); polygonButton.addActionListener(listener); group = new ButtonGroup(); group.add(lineButton); group.add(rectButton); group.add(ovalButton); group.add(arcButton); group.add(polygonButton); pane = new JPanel(); pane.add(lineButton); pane.add(rectButton); pane.add(ovalButton); pane.add(arcButton); pane.add(polygonButton); renderShape = new CustomShape(); frame.add(pane, BorderLayout.PAGE_START); frame.add(renderShape, BorderLayout.CENTER); frame.pack(); frame.setVisible(true); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); }}
