java1.8 list 多条件排序

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分类专栏： java 文章标签： java

于 2019-03-29 16:34:54 首次发布

本文链接：https://blog.youkuaiyun.com/u010772230/article/details/88896422

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本文提供了一个使用Java进行对象列表排序的例子，展示了如何根据订单ID降序及用户ID的不同顺序进行排序。通过Comparator接口实现了多种排序逻辑，包括订单ID降序、用户ID升序或降序等。

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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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