split List to List<List<T>> - Java java.util

Java examples for java.util:List Split

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Description

split List to List<List<T>>

Demo Code

/*******************************************************************************
 * Copyright 2015 MobileMan GmbH//  w  ww  . j a v a  2  s.c om
 * www.mobileman.com
 * 
 * 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.
 ******************************************************************************/
//package com.book2s;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Main {
    public static void main(String[] argv) {
        List list = java.util.Arrays.asList("asdf", "book2s.com");
        int splitSize = 42;
        System.out.println(split(list, splitSize));
    }

    /**
     * @param list
     * @param splitSize
     * @return splited collection
     */
    public static <T> List<List<T>> split(List<T> list, int splitSize) {
        if (list == null || list.isEmpty() || splitSize <= 0) {
            return Collections.emptyList();
        }

        List<List<T>> result = new ArrayList<List<T>>();
        if (list.size() > splitSize) {
            int fromIndex = 0;
            while (true) {
                int toIndex = fromIndex + splitSize;
                if (toIndex > list.size()) {
                    toIndex = list.size();
                }
                result.add(list.subList(fromIndex, toIndex));
                fromIndex += splitSize;
                if (fromIndex >= list.size()) {
                    break;
                }
            }
        } else {
            result.add(list);
        }

        return result;
    }
}

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