J'ai une erreur: "java.lang.NullPointerException"
Bonjour,
Je suis debutant dans le monde de la programmation java;
j'ai cette erreur depuis 2 jours je n'arrive pas a la resoudre, est ce que quelqu'un peur m'aider ?
Merciii
voici l'erreur:
Citation:
Exception in thread "main" java.lang.NullPointerException
at TimeSeriesDemo5.createDataset(TimeSeriesDemo5.java:66)
at TimeSeriesDemo5.<init>(TimeSeriesDemo5.java:21)
at TimeSeriesDemo5.main(TimeSeriesDemo5.java:115)
Voici le code:
Code:
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| import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.data.general.SeriesException;
import org.jfree.data.time.Day;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
public class TimeSeriesDemo5 extends ApplicationFrame {
public TimeSeriesDemo5(final String title) {
super(title);
XYDataset dataset = createDataset(null);
JFreeChart chart = createChart(dataset);
ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
chartPanel.setMouseZoomable(true, false);
setContentPane(chartPanel);
}
public byte[] getStream(String fichier)
{
FileInputStream fileInput = null;
try {
fileInput = new FileInputStream(fichier);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
int n = 0;
try {
n = fileInput.available();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} //renvoie le nb d'octet n dans fichier
//System.out.println(n);
byte [] buffer = new byte[n+1]; // creation buffer
//System.out.print(n+1);
for(int a=0; a <=n; a++)
{
try {
fileInput.read(buffer);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} // stockage donnee dans buffer
}
return buffer;
}
public XYDataset createDataset(byte [] buffer) {
byte[] buffer2 = new byte[buffer.length];
System.arraycopy(buffer, 0, buffer2, 0, buffer.length);
/* int c = buffer.length;
System.out.print(c);*/
TimeSeries series = new TimeSeries("Random Data");
/*for(int i=0;i<57389;i++)
{
System.out.println(buffer[i]);
}*/
Day current = new Day(1,1,2008);
/* for (int i = 0; i <=n; i++) {
try {
double value = new Double (buffer[i]);
value = value + Math.random() - 0.5;
series.add(current, value);
current = (Day) current.next();
}
catch (final SeriesException e) {
System.err.println("Error adding to series");
}
}*/
return new TimeSeriesCollection(series);
}
public JFreeChart createChart(final XYDataset dataset) {
return ChartFactory.createTimeSeriesChart(
"Test",
"Day",
"Value",
dataset,
false,
false,
false
);
}
public static void main(final String[] args) {
String title = "GRAPHIQUE";
TimeSeriesDemo5 t = new TimeSeriesDemo5(title);
byte[] buffer = t.getStream("erkan.wav");
int n=buffer.length;
System.out.print("valeur de n:"+n);
for(int a=0;a<n;a++)
{
System.out.println("valeur"+a+" "+Integer.toString((buffer[a]&0xff))+" ");
}
t.createDataset(buffer);
t.pack();
t.setVisible(true);
}
} |
PS: Le code qui est en commentaire n'est pas encore tester ;).
