在开始活动之前,需要单击两次Java jButton

我正在Netbeans 7.1中构建一个GUI,它代表了医院设备项目的输液泵.按jButton1应显示某个jLabel,表示输液正在运行.再次按jButton1应该停止它.我唯一的问题是按钮需要在第一次工作之前点击两次.在那之后,它完全符合我希望它的工作方式.我在这个问题上搜索了多个线程,但其他解决方案似乎不起作用.谁能帮我？提前致谢！

  package infusion;
  public class Infusion {
    static Interface screen;

    public Infusion(){

        screen = new Interface();
        screen.setVisible(true);
        screen.jLabel3.setVisible(true);
        screen.jButton1.setVisible(true);
    }    

    public static void main(String[] args) {
        // TODO code application logic here
        Infusion infusion = new Infusion();
    }
   }

这是用户界面的代码(主要由Netbeans生成). jButton1ActionPerformed的实现是我调整过的唯一代码.

package infusion;

    public class Interface extends javax.swing.JFrame {
        boolean pump1Running = false;
        /**
         * Creates new form Interface
         */
        public Interface() {
            initComponents();
        }


        /**
         * This method is called from within the constructor to initialize the form.
         * WARNING: Do NOT modify this code. The content of this method is always
         * regenerated by the Form Editor.
         */
        @SuppressWarnings("unchecked")
        //