List每次取100条进行处理

左手的ㄟ右手 2024-04-17 14:28 54阅读 0赞

import java.util.ArrayList;
    import java.util.List;
    public class DealListByBatch {
    
        /**
         * 通过list的     subList(int fromIndex, int toIndex)方法实现
         * @param sourList 源list
         * @param batchCount 分组条数
         */
        public static void dealBySubList(List<Object> sourList, int batchCount){
            int sourListSize = sourList.size();
            int subCount = sourListSize%batchCount==0 ? sourListSize/batchCount : sourListSize/batchCount+1;
            int startIndext = 0;
            int stopIndext = 0;
            for(int i=0;i<subCount;i++){
                stopIndext = (i==subCount-1) ? stopIndext + sourListSize%batchCount : stopIndext + batchCount;
                List<Object> tempList = new ArrayList<Object>(sourList.subList(startIndext, stopIndext));
                printList(tempList);
                startIndext = stopIndext;
            }
        }
    
        /**
         * 通过源list数据的逐条转移实现
         * @param sourList 源list
         * @param batchCount 分组条数
         */
        public static void dealByRemove(List<Object> sourList, int batchCount){
            List<Object> tempList = new ArrayList<Object>();
            for (int i = 0; i < sourList.size(); i++) {
                tempList.add(sourList.get(i));
                if((i+1)%batchCount==0 || (i+1)==sourList.size()){
                    printList(tempList);
                    tempList.clear();
                }
            }
        }
    
        /**
         * 打印方法 充当list每批次数据的处理方法
         * @param sourList
         */
        public static void printList(List<Object> sourList){
            for(int j=0;j<sourList.size();j++){
                System.out.println(sourList.get(j));
            }
            System.out.println("------------------------");
        }
    
        /**
         * 测试主方法
         * @param args
         */
        public static void main(String[] args) {
            List<Object> list = new ArrayList<Object>();
            for (int i = 0; i < 260; i++) {
                list.add(i);
            }
            long start = System.nanoTime();
            dealBySubList(list, 100 );
    //        dealByRemove(list, 10);
            long end = System.nanoTime();
            System.out.println("The elapsed time :" + (end-start));
    
        }
    }