Java List Sub List splitIntoSubListsByNumber(final List list, final int numberOfSublists)

Description

split Into Sub Lists By Number

License

Open Source License

Declaration

public static <T> List<List<T>> splitIntoSubListsByNumber(final List<T> list, final int numberOfSublists) 

Method Source Code

//package com.java2s;
/*-//w w  w  . j ava  2  s  .c  o  m
 * ============================LICENSE_START============================
 * data.messie (core)
 * =====================================================================
 * Copyright (C) 2013 - 2017 Dr. Raphael Romeikat
 * =====================================================================
 * This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public
License along with this program.  If not, see
<http://www.gnu.org/licenses/gpl-3.0.html>.
 * =============================LICENSE_END=============================
 */

import java.util.ArrayList;

import java.util.List;

public class Main {
    public static <T> List<List<T>> splitIntoSubListsByNumber(final List<T> list, final int numberOfSublists) {
        final int sizeOfSublists = (int) Math.ceil((double) list.size() / (double) numberOfSublists);
        return splitIntoSubListsBySize(list, sizeOfSublists);
    }

    public static <T> List<List<T>> splitIntoSubListsBySize(final List<T> list, final int sizeOfSublists) {
        final List<List<T>> subLists = new ArrayList<List<T>>();
        // Only one sublist
        if (sizeOfSublists < 1) {
            subLists.add(list);
            return subLists;
        }
        // Divide
        for (int i = 0;; i++) {
            final int fromIndex = i * sizeOfSublists;
            int toIndex = (i + 1) * sizeOfSublists;
            final boolean lastSublist = list.size() <= toIndex;
            if (lastSublist) {
                toIndex = list.size();
            }
            final List<T> subList = new ArrayList<T>(list.subList(fromIndex, toIndex));
            subLists.add(subList);
            // No more sublists to go
            if (lastSublist) {
                break;
            }
        }
        // Done
        return subLists;
    }
}

Related

1. getSubListIndex(Object[] tofind, Object[] tokens)
2. isSubList(List l1, List l)
3. lastIndexOfSubList(final List list0, final List list1)
4. slice(List stringList, int subListSize)
5. split(List from, int subListSize)
6. splitList(List list, int subListNumber)
7. splitListToSubLists(List parentList, int subListSize)
8. startsWith(final List list, final List subList)
9. sub(List l, int index)