Code
JFileChooser fileChooser = new JFileChooser() {
@Override public void approveSelection() {
File f = getSelectedFile();
if(f.exists() && getDialogType() == SAVE_DIALOG) {
String m = String.format(
"<html>%s already exists.<br>Do you want to replace it?",
f.getAbsolutePath());
int rv = JOptionPane.showConfirmDialog(
this, m, "Save As", JOptionPane.YES_NO_OPTION);
if(rv!=JOptionPane.YES_OPTION) {
return;
}
}
super.approveSelection();
}
};
