private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton6ActionPerformed
  Transferable clipboardContent = getToolkit().getSystemClipboard().getContents(this);

        if ((clipboardContent != null)
                && (clipboardContent.isDataFlavorSupported(DataFlavor.stringFlavor))) {
            try {
                String tempString;
                tempString = (String) clipboardContent.getTransferData(DataFlavor.stringFlavor);
                jTextField4.setText(tempString);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }    }//GEN-LAST:event_jButton6ActionPerformed