filter Map by lambda function - Java java.util

Java examples for java.util:Map Operation

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Description

filter Map by lambda function

Demo Code

/*//from ww  w .j  a  v  a 2  s. c o  m
 * Copyright 2010 the original author or authors.
 *
 * Licensed under the Apache 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.apache.org/licenses/LICENSE-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.ArrayList;
import java.util.Collection;
import java.util.function.Function;

public class Main{
    public static <E, F> ArrayList<F> filterMap(Collection<E> collection,
            Function<? super E, ? extends F> function) {
        ArrayList<F> result = new ArrayList<F>(collection.size());

        for (E elem : collection) {
            F resultElem = function.apply(elem);
            if (resultElem != null)
                result.add(resultElem);
        }

        return result;
    }
}

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