我想您想执行以下操作：
barChart.getCategoryPlot().getRangeAxis().setLowerBound(9.0);
你在哪里
barChart JFreeChart Object。
但是，由于您的值高于9.0E8（超过9000），因此您不应该将
下限设置为9.0E8而不是9.0，因为
当您达到9.0E8或更高时，0和9之间的差异并不大。
编辑：我已经测试了您的代码，并且可以在Windows
Vista下的计算机上正常工作…
我的完整代码在这里：
import java.awt.Color;import java.awt.Dimension;import javax.swing.Jframe;import org.jfree.chart.ChartFactory;import org.jfree.chart.ChartPanel;import org.jfree.chart.JFreeChart;import org.jfree.chart.plot.CategoryPlot;import org.jfree.chart.plot.PlotOrientation;import org.jfree.chart.renderer.category.CategoryItemRenderer;import org.jfree.data.category.CategoryDataset;import org.jfree.data.category.DefaultCategoryDataset;public class ChartTester extends Jframe { private static final long serialVersionUID = 1L; public ChartTester(final String title) { super(title); this.setDefaultCloseOperation(DISPOSE_ON_CLOSE); final CategoryDataset dataset = createDataset(); final JFreeChart chart = createChart(dataset); final ChartPanel chartPanel = new ChartPanel(chart); chartPanel.setPreferredSize(new Dimension(500, 270)); setContentPane(chartPanel); } private CategoryDataset createDataset() { final String rowName = "Row"; final String[] columnName = { "Column1","Column2","Column3","Column4","Column5"}; final DefaultCategoryDataset dataset = new DefaultCategoryDataset(); dataset.addValue(9.2, rowName, columnName[0]); dataset.addValue(9.3, rowName, columnName[1]); dataset.addValue(9.4, rowName, columnName[2]); dataset.addValue(9.5, rowName, columnName[3]); dataset.addValue(10.0, rowName, columnName[4]); return dataset; } private JFreeChart createChart(final CategoryDataset dataset) { double d =9.0; final JFreeChart chart = ChartFactory.createBarChart( "Chart Title", "X Axis", "Y Axis", dataset, PlotOrientation.VERTICAL, true, true, false); chart.setBackgroundPaint(Color.white); // Set the background color of the chart chart.getTitle().setPaint(Color.DARK_GRAY); chart.setBorderVisible(true); // Adjust the color of the title CategoryPlot plot = chart.getCategoryPlot(); plot.getRangeAxis().setLowerBound(d); // Get the Plot object for a bar graph plot.setBackgroundPaint(Color.white); plot.setRangeGridlinePaint(Color.blue); CategoryItemRenderer renderer = plot.getRenderer(); renderer.setSeriesPaint(0, Color.depre("#00008B")); return chart; } public static void main(final String[] args) { final ChartTester test = new ChartTester("Test"); test.pack(); test.setVisible(true); }}
