To open a file in it's editor [Default]

import java.awt.Desktop;
import java.io.File;
import java.io.IOException;

public class Main {
public static void main(String[] a) {
try {
Desktop desktop = null;
if (Desktop.isDesktopSupported()) {
desktop = Desktop.getDesktop();
}

desktop.edit(new File("hellsing.jpg"));
} catch (IOException ioe) {
ioe.printStackTrace();
}


}
}