將JAR添加到NetBeans項目（答案似乎不起作用）

我試圖將JAR添加到NetBeans項目。將JAR添加到NetBeans項目（答案似乎不起作用）

我右鍵單擊庫，然後選擇添加JAR /文件夾並選擇JAR，但導入無法識別。

我知道導入是在那些JAR中，因爲它在Eclipse中工作。

例如，import語句

import org.jfree.chart.ChartFactory;

在紅色下劃線，並有此錯誤消息：

cannot find symbol 
    symbol: class ChartFactory 
    location: package org.jfree.chart 
---- 
(Alt-Enter shows hints)

編輯：

我使用NetBeans 7.3.1已經和JDK 7 u 25（64位）。

包含的項目中，我得到了上述誤差是（希望）可以在這裏找到一個ZIP文件：https://app.promobucket.com/the-church/spine-panel/a-sample-collection-1/splinepanel

的代碼是在這裏：

package splinepanel; 

import java.awt.*;  // Using AWT containers and components 
import javax.swing.*; // Using Swing components and containers 
import org.jfree.data.xy.XYSeries; 
import org.jfree.data.xy.XYSeriesCollection; 
import org.jfree.chart.JFreeChart; 
import org.jfree.chart.ChartFactory; 
import org.jfree.chart.plot.PlotOrientation; 
import org.jfree.chart.ChartPanel; 

/** 
* 
* @author User 
*/ 
public class SplinePanel{ 

    public JPanel createContentPane(){ 

     JPanel panel = new JPanel(); 

     panel.setLayout(new BorderLayout()); 

     XYSeries series = new XYSeries("MyGraph"); 

     series.add(0, 1); 
     series.add(1, 2); 
     series.add(2, 5); 
     series.add(7, 8); 
     series.add(9, 10); 

     XYSeriesCollection dataset = new XYSeriesCollection(); 
     dataset.addSeries(series); 

     JFreeChart chart = ChartFactory.createXYLineChart(
       "XY Chart", 
       "x-axis", 
       "y-axis", 
       dataset, 
       PlotOrientation.VERTICAL, 
       true, 
       true, 
       false 
       ); 
     ChartPanel chartPanel = new ChartPanel(chart); 

     //chart.getXYPlot().setRenderer(new XYSplineRenderer()); 

     panel.add(chartPanel); 

     panel.setOpaque(true); 
     return panel; 
    } 

    private static void createAndShowGUI() { 

     JFrame.setDefaultLookAndFeelDecorated(true); 
     JFrame frame = new JFrame("[=] There's a JPanel in here! [=]"); 

     //Create and set up the content pane. 
     SplinePanel demo = new SplinePanel(); 
     frame.setContentPane(demo.createContentPane()); 

     // The other bits and pieces that make our program a bit more stable. 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setSize(1300, 650); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     //Schedule a job for the event-dispatching thread: 
     //creating and showing this application's GUI. 
     SwingUtilities.invokeLater(new Runnable() { 
      public void run() { 
       createAndShowGUI(); 
      } 
     }); 
    } 
}

編輯2：

該項目現在可在這裏：

https://github.com/bluesh34/SplinePanel/

來源

2013-11-01 George Tomlinson