Insert an annotation to suppress warning : Standard Annotations « Language « Java Tutorial

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import java.util.ArrayList;
import java.util.Iterator;

public class Main {

  @SuppressWarnings("unchecked")
  public static void main(String[] args) {
    ArrayList data = new ArrayList();
    data.add("hello");
    data.add("world");

    Iterator it = data.iterator();
    while (it.hasNext()) {
      System.out.println(it.next());
    }
  }
}