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Categories / Java / Collections Data Structure

 

Is collection is empty, and all of its elements are empty

import java.util.Collection; import java.util.Iterator; public class Utils {   public static <T> boolean isEmpty(Collection<T> c) {     if (c == null || c.size() == 0) {         return true;     }     for (Iterator<T> iter = c.iterator(); iter.hasNext();) {         if (iter.next() != null) {             return false;         }     }     return true;   } }