1-) Java - DOSYAYA YAZAR

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {

if (jFileChooser1.showOpenDialog(this) == jFileChooser1.APPROVE_OPTION) {

try {

FileWriter wr = new FileWriter(jFileChooser1.getSelectedFile().getAbsoluteFile(), true);

String[] satirlar = jTextArea1.getText().split("\n");

for (int i = 0; i < satirlar.length; i++) {

wr.write(satirlar[i]);

wr.write("\n");

}wr.close();

} catch (Exception ee) { } } }