您的示例似乎混合了此处建议的两种方法，从您自己的actionPerformed()实现中调用了图表面板的处理程序。图表面板处理程序可重用，但不可重入。而是直接使用图表面板的实现。下面的示例着重于两个按钮来放大和缩小域：
toolBar.add(createButton("Zoom In X", ZOOM_IN_DOMAIN_COMMAND));toolBar.add(createButton("Zoom Out X", ZOOM_OUT_DOMAIN_COMMAND));…private JButton createButton(String name, String command) { final JButton b = new JButton(name); b.setActionCommand(command); b.addActionListener(chartPanel); return b;}这个完整的示例createButton()重构了使用可用缩放处理程序的方法，并使用进行了说明JToolBar。
import java.awt.BorderLayout;import java.awt.EventQueue;import java.text.NumberFormat;import javax.swing.JButton;import javax.swing.Jframe;import javax.swing.JPanel;import javax.swing.JToolBar;import org.jfree.chart.ChartFactory;import org.jfree.chart.ChartPanel;import org.jfree.chart.JFreeChart;import org.jfree.chart.axis.NumberAxis;import org.jfree.chart.plot.XYPlot;import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;import org.jfree.data.time.TimeSeries;import org.jfree.data.time.TimeSeriesCollection;import org.jfree.data.time.Year;import org.jfree.data.xy.XYDataset;import static org.jfree.chart.ChartPanel.*;public class ZoomDemo { private static final String TITLE = "Return On Investment"; private final ChartPanel chartPanel = createChart(); public ZoomDemo() { Jframe f = new Jframe(TITLE); f.setTitle(TITLE); f.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); f.setLayout(new BorderLayout(0, 5)); f.add(chartPanel, BorderLayout.CENTER); chartPanel.setMouseWheelEnabled(true); JPanel panel = new JPanel(); JToolBar toolBar = new JToolBar(); toolBar.add(createButton("Zoom In", ZOOM_IN_BOTH_COMMAND)); toolBar.add(createButton("Zoom In X", ZOOM_IN_DOMAIN_COMMAND)); toolBar.add(createButton("Zoom In Y", ZOOM_IN_RANGE_COMMAND)); toolBar.add(createButton("Zoom Out", ZOOM_OUT_BOTH_COMMAND)); toolBar.add(createButton("Zoom Out X", ZOOM_OUT_DOMAIN_COMMAND)); toolBar.add(createButton("Zoom Out Y", ZOOM_OUT_RANGE_COMMAND)); toolBar.add(createButton("Reset", ZOOM_RESET_BOTH_COMMAND)); toolBar.add(createButton("Reset X", ZOOM_RESET_DOMAIN_COMMAND)); toolBar.add(createButton("Reset Y", ZOOM_RESET_RANGE_COMMAND)); panel.add(toolBar); f.add(panel, BorderLayout.SOUTH); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } private JButton createButton(String name, String command) { final JButton b = new JButton(name); b.setActionCommand(command); b.addActionListener(chartPanel); return b; } private ChartPanel createChart() { XYDataset roiData = createDataset(); JFreeChart chart = ChartFactory.createTimeSeriesChart( TITLE, "Date", "Value", roiData, true, true, false); XYPlot plot = chart.getXYPlot(); XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) plot.getRenderer(); renderer.setbaseShapesVisible(true); NumberFormat currency = NumberFormat.getCurrencyInstance(); currency.setMaximumFractionDigits(0); NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis(); rangeAxis.setNumberFormatOverride(currency); return new ChartPanel(chart); } private XYDataset createDataset() { TimeSeriesCollection tsc = new TimeSeriesCollection(); tsc.addSeries(createSeries("Projected", 200)); tsc.addSeries(createSeries("Actual", 100)); return tsc; } private TimeSeries createSeries(String name, double scale) { TimeSeries series = new TimeSeries(name); for (int i = 0; i < 6; i++) { series.add(new Year(2016 + i), Math.pow(2, i) * scale); } return series; } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { ZoomDemo cpd = new ZoomDemo(); } }); }}
