通过java记录数据持续变化时间代码解析

[{count=0, time=0},
{count=10, time=1000},
{count=20, time=2000},
{count=30, time=3000},
{count=40, time=4000},
{count=null, time=5000},
{count=null, time=6000},
{count=null, time=7000},
{count=null, time=8000},
{count=null, time=9000},
{count=100, time=10000},
{count=110, time=11000},
{count=120, time=12000},
{count=130, time=13000},
{count=140, time=14000}]

package com.stop;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * static boolean temp_flag; // 记录容器
  public void execute(boolean flag) {
    if (temp_flag == flag) {
      // 没有变化
    } else {
      if (flag == false) {
        // 上次是true，本次是false
      } else {
        // 上次是false本次是true
      }
    }
  }
 */
public class Test {
  public static List<Map<String, Object>> buildList() {
    List<Map<String, Object>> items = new ArrayList<>();
    for(int i=0;i<5;i++) {
      Map<String,Object> map = new HashMap<>();
      map.put("time", i*1000);
      map.put("count", i*10);
      items.add(map);
    }
    for(int i=5;i<10;i++) {
      Map<String,Object> map = new HashMap<>();
      map.put("time", i*1000);
      map.put("count", null);
      items.add(map);
    }
    for(int i=10;i<15;i++) {
      Map<String,Object> map = new HashMap<>();
      map.put("time", i*1000);
      map.put("count", i*10);
      items.add(map);
    }
    return items;
  }



  public static void main(String[] args) {
    // 构造数据
    List<Map<String, Object>> items = buildList();
    
    List<Map<String, Object>> list = new ArrayList<>();
    boolean isStop = false;// 记录容器
    for (int i = 0; i < items.size(); i++) {
      boolean flag = items.get(i).get("count") == null;
      if (i == 0) {
        Map<String, Object> map = new HashMap<>();
        if (flag) {
          map.put("stop", items.get(i).get("time"));
          isStop = true;
        } else {
          map.put("recover", items.get(i).get("time"));
        }
        list.add(map);
        continue;
      }
      if (isStop == flag) {
        // 没有变化
      } else {
        isStop = flag;
        Map<String, Object> map = new HashMap<>();
        if (!flag) {
          // 上次是true，本次是false
          map.put("recover", items.get(i).get("time"));
        } else {
          // 上次是false本次是true
          map.put("stop", items.get(i).get("time"));
        }
        list.add(map);
      }
    }
    System.out.println(list);
  }

}

[{recover=0}, {stop=5000}, {recover=10000}]