search in java ArrayList

Question

I\'m trying to figure out the best way to search a customer in an ArrayList by its Id number. The code below is not working; the compiler tells me that I am mis

Answer 1

Even if that topic is quite old, I'd like to add something. If you overwrite equals for you classes, so it compares your getId, you can use:

customer = new Customer(id);
customers.get(customers.indexOf(customer));

Of course, you'd have to check for an IndexOutOfBounds-Exception, which oculd be translated into a null pointer or a custom CustomerNotFoundException.

Answer 2

Personally I rarely write loops myself now when I can get away with it... I use the Jakarta commons libs:

Customer findCustomerByid(final int id){
    return (Customer) CollectionUtils.find(customers, new Predicate() {
        public boolean evaluate(Object arg0) {
            return ((Customer) arg0).getId()==id;
        }
    });
}

Yay! I saved one line!