import java.io.*;
import org.jfree.data.category.DefaultCategoryDataset;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.ChartUtilities;
public class xyLine {
public static void main(String[] args){
try {
/* Step - 1: Define the data for the line chart */
DefaultCategoryDataset line_chart_dataset = new DefaultCategoryDataset();
line_chart_dataset.addValue(15, "schools", "1970");
line_chart_dataset.addValue(30, "schools", "1980");
line_chart_dataset.addValue(60, "schools", "1990");
line_chart_dataset.addValue(120, "schools", "2000");
line_chart_dataset.addValue(240, "schools", "2010");
/* Step -2:Define the JFreeChart object to create line chart */
JFreeChart lineChartObject=ChartFactory.createLineChart("Schools Vs Years","Year","Schools Count",line_chart_dataset,PlotOrientation.VERTICAL,true,true,false);
/* Step -3 : Write line chart to a file */
int width=640; /* Width of the image */
int height=480; /* Height of the image */
File lineChart=new File("line_Chart_example.png");
ChartUtilities.saveChartAsPNG(lineChart,lineChartObject,width,height);
}
catch (Exception i)
{
System.out.println(i);
}
}
}
我正在创建一个带有点的折线图。引起问题的行如下... JFreeChart lineChartObject=ChartFactory.createLineChart("学校与年份","年份","学校计数",line_chart_dataset,PlotOrientation.VERTICAL,true,true,false);
错误是:无法解析类型 org.jfree.util.PublicCloneable。它是从所需的 .class 文件中间接引用的
我已经尝试在 jar 文件中添加 (jfreechart-1.0.14.jar) 但它仍然不起作用。任何人提供任何帮助,我们将不胜感激。
最佳答案
您还需要 jcommon-1.0.14.jar
。参见 Downloading JFreeChart了解更多。
关于java - JFreeChart 实现错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15840388/