Add batch data to the list and take it out to execute every 5 items

I saw a business scenario in the development. Large batches of data will be very time-consuming to execute. One strategy is to process in batches and process a certain amount of data each time. This will improve the efficiency of data processing. The following is what I wrote The code, comments are written on it, if you have any questions or better ideas, suggestions, please write in the comments, thankyou

This is a unit test I wrote, the code can be used directly

@Test
	public void testtheam() {
    
    
		//向list中添加数据，用于后面的测试
		List list = new ArrayList<>();
		for (int i = 1; i < 17; i++) {
    
    
			list.add(i);
		}
		 //list的长度
		 int listSize = list.size();
		 //每5个元素生成一个新list
         int toIndex = 5;
         for (int i = 0; i < list.size(); i += 5) {
    
    
        	  //不足5个元素的生成到一个list中
              if (i + 5 > listSize) {
    
     
                  toIndex = listSize - i;    
              }
              //生成新的list
              List sublist=list.subList(i, i + toIndex);
              Map<String,List> map=new HashMap<String,List>();
              map.put("测试新生成的list:索引从"+i+"--到--"+toIndex, sublist);
              JSONObject jsonObject = JSONObject.fromObject(map);
               //3、将json对象转化为json字符串
               String returnjson = jsonObject.toString();
              System.out.println(returnjson );
         }
		
	}

This is the result of the data ran out of the console, which is often nice

{
    
    "测试新生成的list:索引从0--到--5":[1,2,3,4,5]}
{
    
    "测试新生成的list:索引从5--到--5":[6,7,8,9,10]}
{
    
    "测试新生成的list:索引从10--到--5":[11,12,13,14,15]}
{
    
    "测试新生成的list:索引从15--到--1":[16]}