import java.awt.*;import java.awt.event.*;class NeikeZhuanjia extends Frame implements ItemListener,ActionListener{public static String str1;int index;Label l1,l2,l3,l4,l5;Button b1,b2;TextArea ta1;TextField t1,t2;Choice ch1;Panel p1;NDoctor[] NDr={ new NDoctor("张三","男","主任医师",15), new NDoctor("李四","男","副主任医师",30), new NDoctor("王五","女","副主任医师",30), new NDoctor("钱六","女","副主任医师",30)};NeikeZhuanjia(){super("x医院自助挂号专家");l1=new Label("今日内科专家号：",Label.CENTER);l2=new Label("今日出诊专家简介");l3=new Label("此专家今日出诊号总数目：");l4=new Label("如果您挂号，将是第X号");b1=new Button("挂号");b2=new Button("返回上一级");ta1=new TextArea(6,15);t1=new TextField(10);t1.setEditable(false);t2=new TextField(10);t2.setEditable(false);Choice ch1=new Choice(