初学java,遇到个小难题,小第请路过的高人指教啊.在线等,急啊!!
我刚学java,学的不好,现在正在拼命的学,还请哪位路过的指教啊.
不胜感激!

我想把在CheckInPanel类中的String类型的值设置为在CheckOutPanel类中的cardIdField的值,请问怎么能做到呢?
public   class   CheckInPanel   extends   JPanel   {
public   CheckInPanel()   {

    }
}

public   class   CheckOutPanel   extends   JPanel   {
  private   JTextField   cardIdField   =   new   JTextField();
.....
    public   CheckOutPanel()   {
          this.add(cardIdField,   null);
          cardIdField.setText( " ");

    }
}




------解决方案--------------------
public class CheckInPanel extends JPanel {
public static String s = "hello word "; //定义一个静态的字符串 可以直接用类名调用
public CheckInPanel() {

}
}


class CheckOutPanel extends JPanel //把public取掉,只能有一个public文件
{
private JTextField cardIdField = new JTextField();

public CheckOutPanel() {
this.add(cardIdField, null);
cardIdField.setText(CheckInPanel.s);
}
}

------解决方案--------------------
public class CheckInPanel extends JPanel {
public String s = "hello word ";
public CheckInPanel() {

}
}


class CheckOutPanel extends JPanel {
private JTextField cardIdField = new JTextField();
CheckInPanel check=new CheckInPanel();
public CheckOutPanel() {
this.add(cardIdField, null);
cardIdField.setText(check.s);
}
}我同意这一种