Java List Flatten flatten(List list, List flat)

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    Description

    Helper method to flatten a potential list of lists into a list of objects.

    License

    Open Source License

    Parameter

    Parameter Description
    list First list.
    flat Second list.

    Declaration 

    private static void flatten(List<?> list, List<Object> flat)

    Method Source Code

    //package com.java2s;

import java.util.ArrayList;

import java.util.List;

public class Main {
    /**//from  ww  w.  j a  va  2s.c o m
     * Helper method to flatten a potential list of lists into a list of
     * objects.
     * @param list First list.
     * @param flat Second list.
     */
    private static void flatten(List<?> list, List<Object> flat) {
        for (Object item : list) {
            if (item instanceof List<?>) {
                flatten((List<?>) item, flat);
            } else {
                flat.add(item);
            }
        }
    }

    /**
     * Flattens a potential list of lists into a list of objects.
     * @param list The list to be flattened.
     * @return The flattened list.
     */
    public static List<Object> flatten(List<?> list) {
        List<Object> result = new ArrayList<Object>();
        flatten(list, result);
        return result;
    }
}

    Related

    1. flatten(List> list)
    2. flatten(List input)
    3. flatten(List> nested)
    4. flatten(List>... deeps)
    5. flatten(List l)
    6. flattenList(List> listOfLists)

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