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This article will explain in detail how JAVA tools divide a list into n lists. The quality of the article content is high, so Xiaobian shares it with you as a reference. I hope you have a certain understanding of relevant knowledge after reading this article.

Requirements in Programming

Batch processing of a large piece of data: for example, from (Excel ,txt , database) line by line read data, finally read 1W + data, and then to this 1W + data and business processing, one by one traversal is too slow. You can split this large list into n, and then use n threads to run, so the efficiency will be much faster. The following code is one of the utility classes used in: Divide a List into n small lists

Detailed explanation of train of thought

A: A big list.

A small list of n.

Thinking: division like elementary school. 10/3=3 + 1. 10 pieces of data, divided into 3 lists, that each list is divided into 3 and 1 more, that only the first one is divided into 1 more, the first list is divided into 3 and then plus 1 remainder equals 4. The second list is divided into three, and then the last list is divided into three. The code is as follows, you can copy and run directly

solutions/**

* Divide a list into n lists.

* @param source

* @return

*/

public static List averageAssign(Listsource,intn){

List result=new ArrayList();

int remainder=source.size()%n; //calculate remainder first

int number=source.size()/n; //then quotient

int offset=0;//offset (used to identify the remainder of the addition)

for(int i=0;i0){

value=source.subList(i*number+offset, (i+1)*number+offset+1);

remainder--;

offset++;

}else{

value=source.subList(i*number+offset, (i+1)*number+offset);

}

result.add(value);

}

return result;

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