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…
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);
}
/**
* Returns a sample dataset.
* @return The dataset.
*/
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;
}
/**
* Creates a sample chart.
* @param dataset the dataset.
* @return The chart.
*/
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.decode("#00008B"));
return chart;
}
public static void main(final String[] args) {
final ChartTester test = new ChartTester("Test");
test.pack();
test.setVisible(true);
}
}
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