我想您要执行以下操作：

barChart.getCategoryPlot().getRangeAxis().setLowerBound(9.0);

barChart是您的JFreeChart对象.

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);

}

/**

* 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);

}

}