窗口生成器gui和clase之间的交互

Question

我正在尝试使windowbuilder gui与其他类的逻辑交互，我想从文本字段中读取并放入Arraylist对象中，只需单击一个按钮，我有两种方法，它们都给了我错误“ AWT-EventQueue-0”线程中的异常java.lang.NullPointerException，这是代码

Button btnNewButton = new JButton("New button");
    btnNewButton.setAction(action);
    panel.add(btnNewButton);



}

private class SwingAction extends AbstractAction {
    public SwingAction() {
        putValue(NAME, "SwingAction");
        putValue(SHORT_DESCRIPTION, "Some short description");



    }
    public void actionPerformed(ActionEvent e) {

            Board.setname(textField.getText());
            Board.newcus();

    }
}

方法n°2

         btnNewButton.addActionListener(e->{

         Board.setname(textField.getText());
            Board.newcus();

        }); 

这就是我在船上所做的

    public static void setname(String n) {
     name=n;
   }
 public  static void newcus() {

 Customer a= new Customer();
cus.add(a);
a.setname(name);


 System.out.println(a.getname());
}