Question

  public void collect( int ordNum )
  {
       Basket b = new Basket(ordNum);
       for (Basket b : conveyerBelt) { // line 4
           readyCollected.add(b);
       }
  }

What I’m trying to do with this method is search through an ArrayList for a orderNum. When I find it, I want to add the orderNum i entered in to the readyCollected. Problem: I get an error message on line 4.

Was wondering if you can guys can help me implement this method.

BTW, the conveyerBelt already contains Basket with an order number. So lets say the conveyerBelt contains Basket with order number 3, and I enter in 3, I want it to add Basket to Arraylist readyCollected containing order number 3.

Answer 1

I’m guessing your error is that conveyerBelt is not Iterable. To use the foreach construct, you must make sure the object you are Iterating over implements Iterable.

http://java.sun.com/docs/books/jls/third_edition/html/statements.html#14.14.2

Excerpt:

The Expression must either have type Iterable or else it must be of an array type (§10.1), or a compile-time error occurs.

The scope of a local variable declared in the FormalParameter part of an enhanced for statement (§14.14) is the contained Statement

The meaning of the enhanced for statement is given by translation into a basic for statement.

If the type of Expression is a subtype of Iterable, then let I be the type of the expression Expression.iterator(). The enhanced for statement is equivalent to a basic for statement of the form:

for (I #i = Expression.iterator(); #i.hasNext(); ) {

        VariableModifiersopt Type Identifier = #i.next();
   Statement
}