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public class Ventana extends JFrame{
    JPanel panel;
    public Ventana(){
        setTitle("Como Hacer Graficos con Java");
        setSize(800,600);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
        init();
    }
 
    private void init() {
        panel = new JPanel();
        getContentPane().add(panel);
        // Fuente de Datos
        DefaultCategoryDataset line_chart_dataset = new DefaultCategoryDataset();
        line_chart_dataset.addValue(80, "visitas", "Julio");
        line_chart_dataset.addValue(300, "visitas", "Agosto");
        line_chart_dataset.addValue(600, "visitas", "Septiembre");
        line_chart_dataset.addValue(1200, "visitas", "Octubre"); 
        line_chart_dataset.addValue(2400, "visitas", "Noviembre");   
 
        // Creando el Grafico
        JFreeChart chart=ChartFactory.createLineChart("Trafico en el Blog",
                "Mes","Visitas",line_chart_dataset,PlotOrientation.VERTICAL,
                true,true,false);  
 
        // Mostrar Grafico
        ChartPanel chartPanel = new ChartPanel(chart);
        panel.add(chartPanel);
    }
 
    public static void main(String args[]){
        new Ventana().setVisible(true);
    }
}

Main.java:1: error: class Ventana is public, should be declared in a file named Ventana.java
public class Ventana extends JFrame{
       ^
Main.java:1: error: cannot find symbol
public class Ventana extends JFrame{
                             ^
  symbol: class JFrame
Main.java:2: error: cannot find symbol
    JPanel panel;
    ^
  symbol:   class JPanel
  location: class Ventana
Main.java:4: error: cannot find symbol
        setTitle("Como Hacer Graficos con Java");
        ^
  symbol:   method setTitle(String)
  location: class Ventana
Main.java:5: error: cannot find symbol
        setSize(800,600);
        ^
  symbol:   method setSize(int,int)
  location: class Ventana
Main.java:6: error: cannot find symbol
        setLocationRelativeTo(null);
        ^
  symbol:   method setLocationRelativeTo(<null>)
  location: class Ventana
Main.java:7: error: cannot find symbol
        setDefaultCloseOperation(EXIT_ON_CLOSE);
                                 ^
  symbol:   variable EXIT_ON_CLOSE
  location: class Ventana
Main.java:8: error: cannot find symbol
        setVisible(true);
        ^
  symbol:   method setVisible(boolean)
  location: class Ventana
Main.java:13: error: cannot find symbol
        panel = new JPanel();
                    ^
  symbol:   class JPanel
  location: class Ventana
Main.java:14: error: cannot find symbol
        getContentPane().add(panel);
        ^
  symbol:   method getContentPane()
  location: class Ventana
Main.java:16: error: cannot find symbol
        DefaultCategoryDataset line_chart_dataset = new DefaultCategoryDataset();
        ^
  symbol:   class DefaultCategoryDataset
  location: class Ventana
Main.java:16: error: cannot find symbol
        DefaultCategoryDataset line_chart_dataset = new DefaultCategoryDataset();
                                                        ^
  symbol:   class DefaultCategoryDataset
  location: class Ventana
Main.java:24: error: cannot find symbol
        JFreeChart chart=ChartFactory.createLineChart("Trafico en el Blog",
        ^
  symbol:   class JFreeChart
  location: class Ventana
Main.java:25: error: cannot find symbol
                "Mes","Visitas",line_chart_dataset,PlotOrientation.VERTICAL,
                                                   ^
  symbol:   variable PlotOrientation
  location: class Ventana
Main.java:24: error: cannot find symbol
        JFreeChart chart=ChartFactory.createLineChart("Trafico en el Blog",
                         ^
  symbol:   variable ChartFactory
  location: class Ventana
Main.java:29: error: cannot find symbol
        ChartPanel chartPanel = new ChartPanel(chart);
        ^
  symbol:   class ChartPanel
  location: class Ventana
Main.java:29: error: cannot find symbol
        ChartPanel chartPanel = new ChartPanel(chart);
                                    ^
  symbol:   class ChartPanel
  location: class Ventana
Main.java:34: error: cannot find symbol
        new Ventana().setVisible(true);
                     ^
  symbol:   method setVisible(boolean)
  location: class Ventana
18 errors

Standard output is empty