Java List Partition partition(List list, int size)

Description

partition

License

Apache License

Declaration

static <T> List<List<T>> partition(List<T> list, int size) 

Method Source Code

//package com.java2s;
/**// w  w  w . j  ava  2  s  . c o m
 * Copyright 2013 Sematext Group, Inc.
 *
 * 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 {
    static <T> List<List<T>> partition(List<T> list, int size) {
        if (size <= 0) {
            throw new IllegalArgumentException("Size should be >= 0");
        }
        if (list == null) {
            throw new IllegalArgumentException("List can't be null");
        }
        List<List<T>> partitions = new ArrayList<List<T>>(list.size() / size);
        List<T> partition = new ArrayList<T>(size);
        for (T elem : list) {
            if (partition.size() < size) {
                partition.add(elem);
            } else {
                partitions.add(partition);
                partition = new ArrayList<T>(size);
                partition.add(elem);
            }
        }
        if (!partition.isEmpty()) {
            partitions.add(partition);
        }
        return partitions;
    }
}

Related

1. partition(List all, int partitionSize)
2. partition(List a, int lower, int upper)
3. partition(List items, int slices)
4. partition(List list, int num)
5. partition(List list, int partitionSize)
6. partition(List list, int size)
7. partition(List list, int size)
8. partition(List longList, int length)
9. partition(List orig, int size)