直接上代码:
import com.google.common.collect.Lists;
import lombok.AllArgsConstructor;
import lombok.Data;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;
/**
* List 对象属性排序
*/
@Data
@AllArgsConstructor
class Commodity
{
private String name;
private Double price;
private Integer count;
}
public class Test {
public static void main(String[] args) {
// 创建参数
List<Commodity> list = Lists.newArrayList(
new Commodity("1", 3.3, 10),
new Commodity("2", null, 30),
new Commodity("3", 4.4, 20),
new Commodity("4", 6.6, null),
new Commodity("5", 8.8, 20),
new Commodity("6", 8.8, 20),
new Commodity("7", 7.7, 60),
new Commodity("8", 7.7, 60)
);
// 多排序条件
List<Commodity> orderShopList = list.stream().sorted(Comparator
// 先按数量降序(由于是降序,nullsFirst()方法会将null值放在后面)
.comparing(Commodity::getCount, Comparator.nullsFirst(Integer::compareTo).reversed())
// 然后按价格升序(由于是升序,nullsFirst()方法会将null值放在前面)
.thenComparing(Commodity::getPrice, Comparator.nullsFirst(Double::compareTo))
// 然后按名称降序(如果不设置null值排序规则,字段为null会报错)
.thenComparing(Commodity::getName, Comparator.reverseOrder())
).collect(Collectors.toList());
// 打印排序结果
orderShopList.forEach(System.out::println);
}
}
运行结果如下: