Code analysis of recording the continuous change time of data through Java

This article mainly introduces the code analysis of recording the continuous change time of data through Java. It is introduced in great detail through the example code, which has a certain reference value for everyone's study or work. Friends in need can refer to it

1. Requirement: get the continuous change of count being null and non null

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

2. The code is as follows:

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,null);
      items.add(map);
    }
    for(int i=10;i<15;i++) {
      Map<String,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);
  }

}

3. Run main method results

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

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