java程序编译时无法读取 Teststu.java

class Custdemo
{
public static void main(String[] args)
{
Cust st=new Cust();
st.name="Mike";
st.ID=111;
st.money=1000;
st.PWD="111";

Cust st1=new Cust();
st1.name="Bob";
st1.ID=222;
st1.money=2000;
st1.PWD="222";

Cust st2=new Cust();
st2.name="cindy";
st2.ID=333;
st2.money=3000;
st2.PWD="333";

Cust st3=new Cust();
st3.name="ruby";
st3.ID=444;
st3.money=4000;
st3.PWD="444";

System.out.println("请输入您的ID:");
int ID=Integer.parseInt(KB.scan());

static void run(Cust st)
{
System.out.println("取款之前的查询:");
search();
getmoney();
System.out.println("取款之后的查询:");
search();
};
switch(ID)
{
case 111: