The large list set is divided into multiple small list sets in equal proportion

One : Entity object preparation

package cn.nhdc.cloud.common.annotation;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

@NoArgsConstructor
@AllArgsConstructor
@Data
@Builder
public class Order {

    /**
     *  Order id
     */
    private String orderId;
    /**
     *  Name of the order 
     */
    private String orderName;
}

Two ： Test cases

package cn.nhdc.cloud.common.annotation;

import cn.hutool.core.collection.ListUtil;
import java.util.ArrayList;
import java.util.List;

public class Test11 {
    public static void main(String[] args) {
        List<Order> orders = new ArrayList<Order>() {
   {
            add(Order.builder().orderId("1").orderName(" Order 1").build());
            add(Order.builder().orderId("2").orderName(" Order 2").build());
            add(Order.builder().orderId("3").orderName(" Order 3").build());
            add(Order.builder().orderId("4").orderName(" Order 4").build());
            add(Order.builder().orderId("5").orderName(" Order 5").build());
            add(Order.builder().orderId("6").orderName(" Order 6").build());
            add(Order.builder().orderId("7").orderName(" Order 7").build());
        }};
        List<List<Order>> partition = ListUtil.partition(orders, 2);
        System.err.println(partition);
        List<List<Order>> split = ListUtil.split(orders, 3);
        System.err.println(split);
    }
}

3、 ... and ： Running results

[
 [Order(orderId=1, orderName= Order 1), Order(orderId=2, orderName= Order 2)],
 [Order(orderId=3, orderName= Order 3), Order(orderId=4, orderName= Order 4)], 
 [Order(orderId=5, orderName= Order 5), Order(orderId=6, orderName= Order 6)], 
 [Order(orderId=7, orderName= Order 7)]
 ]
 
[
 [Order(orderId=1, orderName= Order 1), Order(orderId=2, orderName= Order 2), Order(orderId=3, orderName= Order 3)], 
 [Order(orderId=4, orderName= Order 4), Order(orderId=5, orderName= Order 5), Order(orderId=6, orderName= Order 6)],
 [Order(orderId=7, orderName= Order 7)]
 ]