求Java大神帮我看一下！按着书打的，但程序运行有错误。

这样才行

class BankAccount{
   private static int amount=2000; 
   public void despoit(int m){
      amount=amount+m;
      System.out.println("小明存入["+m+"元]");
   }
   public void withdraw(int m){
      amount=amount-m;
      System.out.println("张新取走["+m+"元]") ;
      if(amount<0)
         System.out.println("***余额不足！***");
   }
   public int balance(){
      return amount;
   }
}
class Customer extends Thread{
   String name;
   BankAccount bs;
   public Customer(BankAccount b,String s){
      name=s;
      bs=b;
   }
   public synchronized static void cus(String name,BankAccount bs){
      if(name.equals("小明")){
         try{
            for(int i=0;i<6;i++){
               Thread.sleep((int)(Math.random()*300));
               bs.despoit(1000);
            }
         }catch(InterruptedException e){}
      }else{
         try{
            for(int i=0;i<6;i++){
               Thread.sleep((int)(Math.random()*300));
               bs.withdraw(1000);
            }
         }catch(InterruptedException e){}
      }
   }
   public void run(){
      cus(name,bs);
   }
}
public class AccountTest {
   public static void main(String args[])throws InterruptedException{
      BankAccount bs=new BankAccount();
      Customer customer1=new Customer(bs,"小明");
      Customer customer2=new Customer(bs,"张新");
      customer1.start();
      customer2.start();
      Thread.sleep(500);
   }
}

main函数里面的Customer1和Customer2改成小写就好了

hread t1 = new Thread(customer1);
Thread t2 = new Thread(customer2);