Java List Difference difference(final List minuend, final List subtrahend)

Description

difference

License

Apache License

Declaration

public static List<Double> difference(final List<? extends Object> minuend,
            final List<? extends Object> subtrahend) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright 2015/*from   ww  w.j a v a2 s .c om*/
 * Ubiquitous Knowledge Processing (UKP) Lab
 * Technische Universit?t Darmstadt
 *
 * 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.List;

public class Main {
    public static List<Double> difference(final List<? extends Object> minuend,
            final List<? extends Object> subtrahend) {
        final List<Double> result = new ArrayList<Double>();

        for (int i = 0; i < minuend.size(); ++i) {
            final Object o1 = minuend.get(i);
            final Object o2 = subtrahend.get(i);
            if (areBothNumbers(o1, o2)) {
                subtract(result, o1, o2);
            } else {
                result.add(Double.NaN);
            }
        }

        return result;
    }

    private static boolean areBothNumbers(final Object o1, final Object o2) {
        return o1 instanceof Number && o2 instanceof Number;
    }

    private static void subtract(final List<Double> result, final Object o1, final Object o2) {
        final Number val1 = (Number) o1;
        final Number val2 = (Number) o2;

        result.add(val1.doubleValue() - val2.doubleValue());
    }
}

Related

1. diff(List ls, List ls2)
2. diff(List doublesA, List doublesB)
3. diffAsSet(Collection list1, Collection list2)
4. difference(final List list1, final List list2)
5. difference(final String[] list1, final String[] list2)
6. difference(List firstList, List secondList)
7. difference(List lst1, List lst2)