"The type of the expression must be an array type but it resolved to..."

Question

I have a Customer class.
I have a CustomerDataHelper class that has a method that creates a Customer[][] , populates it with 10 Customers and returns it.
public static Customer[] getCustomerData(){
return new Customer[]{
new Customer(10 ,"Hoertz", "Richard", "123 Main St.", "San Antonio",
                              "TX", "78230"),
new Customer(20, "Smith", "John", "258 Austin Blvd", "Austin",
                              "TX", "78501"),
}               In main I'm calling the method in CustomerDataHelper, getCustomerData, and populating Customer[] cst.
public static void main(String[] args) {
Customer[] cst = getCustomerData();     
for(int i = 0; i < cst.length; i++){
int j = 0;
if (cst[i][j]== 20 || cst[i][j] == 50 || cst[i][j]== 80
|| cst[i][j]==100)
System.out.println(cst);
j++;
My problem is my if statement, it gives me the error message listed in my Subject line for each cst[][]. It resolves it just fine in the for statement and the stdout statement, but not the if statement.
Can someone please explain?

Answer 1

You declare cst as an array of Customers, but then you access it like
cst[i][j] as if it was a double array of somethings.
Possibly you mean something likecst.getId() == 20
where getId() is some method of the Customer that returns whatever
that number argument in the Customer constructor is.