Question

我试图在JDialog中显示一个JFreeChart并且它正确显示但是当我试图在模态JDialog中显示它时它不会显示。以下程序不显示JFreeChart图，直到我评论第31行。什么是原因是什么？

import java.awt.BorderLayout;
import java.awt.Dialog;
import java.awt.Dimension;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class GraphExample extends JDialog{  
    private final JPanel contentPanel = new JPanel(new BorderLayout());
    /**
     * Launch the application.
     */
public static void main(String[] args) {
        try {
            GraphExample graph=new GraphExample(new JFrame(),"Testing");
            graph.createGraphPanel();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
public GraphExample(JFrame parent,String title) {
        super(parent,title);
        setPreferredSize(new Dimension(500, 500));
        this.setModal(true);
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(contentPanel, BorderLayout.CENTER);
        setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
        pack();
        setVisible(true);
    }
public void createGraphPanel(){
        XYSeriesCollection dataset = new XYSeriesCollection();
        XYSeries series1= new XYSeries("First");
        series1.add(1.0, 1.0);
        series1.add(2.0, 4.0);
        series1.add(3.0, 3.0);
        series1.add(4.0, 5.0);
        series1.add(5.0, 5.0);
        series1.add(6.0, 7.0);
        series1.add(7.0, 7.0);
        series1.add(8.0, 8.0);
        dataset.addSeries(series1);
        final JFreeChart chart = createChart(dataset);//,xLabel,yLabel,title,seriesesVector,check);
        final ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new Dimension(400,400));//width height
        contentPanel.add(chartPanel,BorderLayout.CENTER);
        contentPanel.revalidate();
    }
 private JFreeChart createChart(final XYDataset dataset){//, String xLabel, String yLabel, String title,Vector seriesesVector,String check) {
     final JFreeChart result = ChartFactory.createXYLineChart(//createXYAreaChart(//also comment line#218 219 220 also uncomment line#250
             null,
             "X",
             "Y",
             dataset,
             PlotOrientation.VERTICAL,
             true,
             true,
             false
             );
     result.setTitle("Example");
     final XYPlot plot = result.getXYPlot();//domain is x and range is y
     plot.setDomainGridlinesVisible(false);
     plot.setRangeGridlinesVisible(false); 
     return result;
 }
    }

如何在Modal JDialog中显示JFreeChart？

Answer 1

请勿在JDialog上调用setVisible(true)，直到所有内容设置为止。事实上，让它 out 的构造函数，并在声明和构造JDialog的代码中自己调用它，并且只在完成所有操作之后。了解代码流在调用时将被阻止，因此必须最后调用。

所以改变这个：

public GraphExample(JFrame parent,String title) {
    super(parent,title);
    setPreferredSize(new Dimension(500, 500));
    this.setModal(true);
    getContentPane().setLayout(new BorderLayout());
    getContentPane().add(contentPanel, BorderLayout.CENTER);
    setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
    pack();
    setVisible(true);
}

到此：

public GraphExample(JFrame parent,String title) {
    super(parent,title);
    setPreferredSize(new Dimension(500, 500));
    this.setModal(true);
    getContentPane().setLayout(new BorderLayout());
    getContentPane().add(contentPanel, BorderLayout.CENTER);
    setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
    pack();
    // setVisible(true); // **** **** **** ****
}

和此：

public static void main(String[] args) {
    try {
        GraphExample graph=new GraphExample(new JFrame(),"Testing");
        graph.createGraphPanel();
        graph.setVisible(true);  // ****** add *****
    } catch (Exception e) {
        e.printStackTrace();
    }
}

在模态JDialog中看不到JFreeChart？

1 个答案: