Java工具类_List列表或Array数组按指定大小分组

主要用于：批量取一部分数据循环处理

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * 列表或数组按指定大小分组,用于批量取一部分数据循环处理
 *
 */
public class ArraySplitUtil {
    /**
     * 按指定大小对列表分组
     * @param list
     * @param splitSize
     * @return
     */
    public List> splistList(List list, int splitSize) {
        if (null == list) {
            return null;
        }
        int listSize = list.size();
        List> newList = new ArrayList>();
        if (listSize < splitSize) {
            newList.add(list);
            return newList;
        }
        int addLength = splitSize;
        int times = listSize / splitSize;
        if (listSize % splitSize != 0) {
            times += 1;
        }
        int start = 0;
        int end = 0;
        int last = times - 1;
        for (int i = 0; i < times; i++) {
            start = i * splitSize;
            if (i < last) {
                end = start + addLength;
            } else {
                end = listSize;
            }
            newList.add(list.subList(start, end));
        }
        return newList;
    }

    /**
     * 按指定大小对数组分组
     * @param array
     * @param splitSize
     * @return
     */
    public List splistArray(T[] array, int splitSize) {
        if (null == array) {
            return null;
        }
        int listSize = array.length;
        List newList = new ArrayList();
        if (listSize < splitSize) {
            newList.add(array);
            return newList;
        }
        int addLength = splitSize;
        int times = listSize / splitSize;
        if (listSize % splitSize != 0) {
            times += 1;
        }
        int start = 0;
        int end = 0;
        int last = times - 1;
        for (int i = 0; i < times; i++) {
            start = i * splitSize;
            if (i < last) {
                end = start + addLength;
            } else {
                end = listSize;
            }
            newList.add(Arrays.copyOfRange(array, start, end));
        }
        return newList;
    }
}