Example comparing the legacy with generic styles

Legacy non-generic example   
// Typical Collections usage before Java 5
List greetings = new ArrayList();
greetings.add("We come in peace.");
greetings.add("Take me to your leader.");
greetings.add("Resistance is futile.");

Iterator it = greetings.iterator();
while (it.hasNext()) {
    String aGreeting = (String)it.next();
    attemptCommunication(aGreeting);
}

Same example using generics
    // Same example using generics.
List<String> greetings = new ArrayList<String>();
greetings.add("We come in peace.");
greetings.add("Take me to your leader.");
greetings.add("Resistance is futile.");

Iterator<String> it = greetings.iterator();
while (it.hasNext()) {
    String aGreeting = it.next();  // No downcast.
    attemptCommunication(aGreeting);
}

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Posted in: Generics