Retrieves the first element from a collection that matches a predicate. - Java java.util

Java examples for java.util:Collection First Element

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Description

Retrieves the first element from a collection that matches a predicate.

Demo Code


import java.util.Collection;
import java.util.function.Predicate;

public class Main {
  /**//from w  w  w.  j  av a2  s  .c  om
   * Retrieves the first element from a collection that matches a predicate.
   * 
   * @param <T>
   *          The type of elements we are interested in.
   * @param source
   *          A collection containing elements we are interested in. Not null. Can
   *          be empty.
   * @param filter
   *          The predicate determining if an element is to be retrieved. Not
   *          null.
   * @return The first matching element or null if no element matches.
   */
  public static <T> T selectFirst(Collection<? extends T> source, Predicate<T> filter) {
    for (T t : source) {
      if (filter.test(t)) {
        return t;
      }
    }
    return null;
  }
}

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