java list 按照多字段排序

 

list 排序涉及的接口 Comparator, 具體實現代碼如下，以Apple類為例

 

public class Test{
　　public static void main(String [] args){
　　　　　List<Apple> apples = new ArrayList<>();
        Comparator<Apple> byName = Comparator.comparing(Apple::getName);
        Comparator<Apple> bySizeDesc = Comparator.comparing(Apple::getSize).reversed();
　　　　 apples.sort(byName.thenComparing(bySizeDesc)); 　　 // 先以名稱升序排列，再按照size倒敘排列
　　}
}

@Data
public class Apple{ private String color; private String name; private Integer size;

}