Re: How to save a new data file inside the executable JAR package?

JTL.zheng wrote:


<sscce>
import java.awt.Point;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;

import java.util.prefs.Preferences;

class MemoryFrame extends JFrame {

  MemoryFrame() {
    super("MemoryFrame");

    JTextArea ta = new JTextArea( "Remembers location.." );
    getContentPane().add(ta);
    pack();
    setSize(400,300);

    // probably better to use the systemNodeForPackage(this)
    // form here, but since this class is in the default
    // package, I'll go with the root prefs.
    final Preferences prefs = Preferences.systemRoot();

    int x, y;

    Integer xObj = prefs.getInt( "MemoryFrame.x", 50 );
    Integer yObj = prefs.getInt( "MemoryFrame.y", 50 );

    x = xObj.intValue();
    y = yObj.intValue();

    setLocation(x,y);

    this.addWindowListener( new WindowAdapter() {
        public void windowClosing(WindowEvent we) {
          Point location = getLocation();
          prefs.putInt(
            "MemoryFrame.x",
            new Integer(location.x) );
          prefs.putInt(
            "MemoryFrame.y",
            new Integer(location.y) );
          System.exit(0);
        }
      } );
  }

  public static void main(String[] args) {
    Thread t = new Thread() {
      public void run() {
        MemoryFrame frame = new MemoryFrame();
        frame.setVisible(true);
      }
    };
    SwingUtilities.invokeLater( t );
  }
}
</sscce>

--
Andrew Thompson
http://www.athompson.info/andrew/

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