Question

我有这个教程，但我无法解决它。如果有更多的错误，请告诉我如何解决它，因为我是java的新手。这是我的代码：

import java.util.ArrayList;
import java.util.Collections; 

public class Customer
{
   public static void main(String args[]){

   Arraylist listcustomer1 = new Arraylist();``
   Arraylist listcustomer2 = new Arraylist();

   Scanner scan = new Scanner(System.in);
   customer a = new customer;

for(i=0;i<30;i++)
{
 System.out.println("Enter customer name : ");
name = scan.next;
System.out.prinln("Enter customer id :" );
int custId= scan.nextInt;
System.out.println("Enter number of purchases :");
int numOfPurchases = scan.nextInt;
System.out.println("Enter the city :");  
city = scan.next;

listcustomer1.add(i);

}

 int total =0,avg = 0;

  for(int i=0;i<listcustomer1.numOfPurchase;i++)
{

 total= total+numOfPurchase;

 avg = total/listcustomer1;

 if(listcustomer1.numOfPurchase<10){

 listcustomer1.remove(i);

 Collections.copy(listcustomer2,i);
}   

}


System.out.println("Customer Purchase Information ");
System.out.println("Total number of purchases from all cities " +total);    
System.out.println("Average number of purchase from all cities " +avg);

 }
 }

我收到此错误错误customer.java:12：错误：(或[期待customer a = new customer;

有人可以解释一下吗？

Answer 1

在此行中，客户a =新客户;您忘了写()将其替换为Customer a = new Customer();

此外，您的班级名称为Customer而非customer。请记住，java是区分大小写的

Answer 2

这不是有效的Java声明：

Customer a = new Customer; // Invalid

将其更改为：

Customer a = new Customer();

错误customer.java:12：错误：'（'或'['预期客户a =新客户;

2 个答案: