List is divided into sets that meet and do not meet conditions (partitioningby)

One ： Collection object entity

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;

    /**
     *  Order type   1 For meituan  2 other 
     */
    private String orderType;
}

Two ： Running cases

package cn.nhdc.cloud.common.annotation;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class Test11 {
    public static void main(String[] args) {
        List<Order> orders = new ArrayList<Order>() {
   {
            add(Order.builder().orderId("1").orderName(" Order 1").orderType("1").build());
            add(Order.builder().orderId("2").orderName(" Order 2").orderType("1").build());
            add(Order.builder().orderId("3").orderName(" Order 3").orderType("1").build());
            add(Order.builder().orderId("4").orderName(" Order 4").orderType("1").build());
            add(Order.builder().orderId("5").orderName(" Order 5").orderType("1").build());
            add(Order.builder().orderId("6").orderName(" Order 6").orderType("2").build());
            add(Order.builder().orderId("7").orderName(" Order 7").orderType("2").build());
            add(Order.builder().orderId("8").orderName(" Order 8").orderType("3").build());
        }};
        // Split by condition   Two sets that satisfy and do not satisfy conditions 
        Map<Boolean, List<Order>> collect = orders.parallelStream().collect(Collectors.partitioningBy(order -> "1".equals(order.getOrderType())));
        System.err.println(collect);
    }
}

3、 ... and ： Running results

{
false=[Order(orderId=6, orderName= Order 6, orderType=2), Order(orderId=7, orderName= Order 7, orderType=2), Order(orderId=8, orderName= Order 8, orderType=3)], 
true=[Order(orderId=1, orderName= Order 1, orderType=1), Order(orderId=2, orderName= Order 2, orderType=1), Order(orderId=3, orderName= Order 3, orderType=1), Order(orderId=4, orderName= Order 4, orderType=1), Order(orderId=5, orderName= Order 5, orderType=1)]
}