java1.8 list 多条件排序

Bertha 。 2022-02-26 10:56 451阅读 0赞

public static void main(String[] args) {
    
    
        String orderId1 = "2321837281372913";
        String userId1 = "20180701001";
        String orderId2 = "2321837281372914";
        String userId2 = "20180701002";
        String orderId3 = "2321837281372912";
        String userId3 = "20180701003";
        String orderId5 = "2321837281372918";
        String userId5 = "20180701004";
        String orderId6 = "2321837281372918";
        String userId6 = "20180701009";
        String orderId4 = "2321837281372918";
        String userId4 = "20180701005";
        
        Order order = new Order();
        order.setUserId(userId1);
        order.setOrderId(orderId1);
        Order order1 = new Order();
        order1.setOrderId(orderId2);
        order1.setUserId(userId2);
    
        Order order2 = new Order();
        order2.setOrderId(orderId3);
        order2.setUserId(userId3);
        Order order3 = new Order();
        order3.setOrderId(orderId4);
        order3.setUserId(userId4);
        Order order4 = new Order();
        order4.setOrderId(orderId5);
        order4.setUserId(userId5);
        Order order5 = new Order();
        order5.setUserId(userId6);
        order5.setOrderId(orderId6);
    
        List<Order> orderList = new ArrayList<Order>();
        orderList.add(order);
        orderList.add(order1);
        orderList.add(order2);
        orderList.add(order3);
        orderList.add(order4);
        orderList.add(order5);
    
        System.out.println(orderList.toString());
        System.out.println("=========================");
        System.out.println("=======这样子就是以orderid降序，如果ordeid相同再以userid降序==================");
        orderList.sort(Comparator.comparing(Order::getOrderId).thenComparing(Order::getUserId).reversed());
        System.out.println(orderList.toString());
    
        System.out.println("=======这样子就是以orderid降序，如果ordeid相同再以userid升序==================");
        orderList.sort(Comparator.comparing(Order::getOrderId).reversed().thenComparing(Order::getUserId));
        System.out.println(orderList.toString());
    
        System.out.println("=======这样子就是以orderid升序，如果ordeid相同再以userid升序==================");
        orderList.sort(Comparator.comparing(Order::getOrderId).thenComparing(Order::getUserId));
        System.out.println(orderList.toString());
    
        System.out.println("=======这样子就是以orderid升序，如果ordeid相同再以userid降序==================");
              orderList.sort(Comparator.comparing(Order::getOrderId).reversed().thenComparing(Order::getUserId).reversed());
        System.out.println(orderList.toString());
    
    
    }

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