java List分批处理

package com.example.demo;
import com.google.common.collect.Lists;
import java.util.ArrayList;
import java.util.List;
public class Test {
    public static void main(String[] args) {
        List<Integer> list = new ArrayList<>();
        for (int i = 0; i < 1500; i++) {
            list.add(i);
        }
        newBatchProcessing(list);
        //谷歌工具包里的 Lists.partition
        oldBatchProcessing(list);
        //传统切割
    }
    public static void newBatchProcessing(List<Integer> numList) {
        List<List<Integer>> lists = Lists.partition(numList, 1000);
        for (List<Integer> list : lists) {
            System.out.println(list);
            //这里就可以分批对数据进行处理了
        }
    }
    /**
 * 传统方法分批
 */
    public static void oldBatchProcessing(List<Integer> list){
        int listSize = list.size();
        int toIndex = 1000;
        for (int i = 0; i< list.size(); i += 1000){
            if(i + 1000 > listSize){
                //作用为toIndex最后没有900条数据则剩余几条newList中就装几条
                toIndex = listSize - i;
            }
            List<Integer> newList = list.subList(i, i + toIndex);
            //分批数据做具体处理
            System.out.println(newList);
        }
    }
}