Returns the first element in as that satisfies a predicate p. - Java java.util

Java examples for java.util:Collection First Element

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Description

Returns the first element in as that satisfies a predicate p.

Demo Code

/**//w  w  w.  j a  va  2  s  . c  o m
 *  Copyright 2009, 2010 The Regents of the University of California
 *  Licensed under the Educational Community License, Version 2.0
 *  (the "License"); you may not use this file except in compliance
 *  with the License. You may obtain a copy of the License at
 *
 *  http://www.osedu.org/licenses/ECL-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an "AS IS"
 *  BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 *  or implied. See the License for the specific language governing
 *  permissions and limitations under the License.
 *
 */
import java.util.Collection;
import java.util.Optional;
import java.util.function.Predicate;

public class Main {
  /**
   * Returns the first element in <code>as</code> that satisfies a predicate
   * <code>p</code>.
   */
  public static <A> Optional<A> find(Collection<A> as, Predicate<A> p) {
    for (A x : as) {
      if (p.test(x))
        return Optional.of(x);
    }
    return Optional.empty();
  }
}

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