对于此用法，“如何使用工具提示”建议重写
getToolTipText()封闭方法
JComponent。此答案概述了JMapViewer和的方法
ChartPanel。在下面的例子中，
getToolTipText()简单地返回的任何名称Shape即
contains()触发鼠标事件。为了进行比较，JLabelat窗口的底部使用了常规的技巧提示
setToolTipText()。
import java.awt.BasicStroke;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import java.awt.EventQueue;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Polygon;import java.awt.Shape;import java.awt.event.MouseEvent;import java.awt.geom.Ellipse2D;import java.util.ArrayList;import java.util.List;import javax.swing.Jframe;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.ToolTipManager;public class ShapeToolTip { private static class ShapePanel extends JPanel { private final List<Shape> list = new ArrayList<>(); public ShapePanel() { Polygon p = new Polygon(); p.addPoint(500, 100); p.addPoint(500, 400); p.addPoint(200, 400); list.add(p); list.add(new Ellipse2D.Double(100, 100, 200, 200)); ToolTipManager.sharedInstance().registerComponent(this); } @Override public String getToolTipText(MouseEvent e) { for (Shape shape : list) { if (shape.contains(e.getX(), e.getY())) { return shape.getClass().getName(); } } return "Outside"; } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.blue); Graphics2D g2d = (Graphics2D) g; g2d.setStroke(new BasicStroke(2)); for (Shape shape : list) { g2d.draw(shape); } } @Override public Dimension getPreferredSize() { return new Dimension(640, 480); } } private void display() { Jframe f = new Jframe("ShapeToolTip"); f.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); f.add(new ShapePanel()); JLabel title = new JLabel("Shape Tool Tip", JLabel.CENTER); title.setToolTipText("Title"); title.setFont(title.getFont().deriveFont(Font.BOLD, 24)); f.add(title, BorderLayout.SOUTH); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } public static void main(String[] args) { EventQueue.invokeLater(new ShapeToolTip()::display); }}
