java list sort by multiple fields java list sort by multiple fields

java list sort by multiple fields

 

List sorting involves the interface Comparator, the specific implementation code is as follows, taking the Apple class as an example

 

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)); 　　 // 先以名称升序排列，再按照size倒叙排列
　　}
}

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

}