java8 把List<Object> 根据某字段去重

import java.util.ArrayList;
import java.util.List;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.subject.Subject;
import java.util.*;
import java.util.stream.Collectors;

import static java.util.Comparator.comparing;
import static java.util.Comparator.comparingLong;
import static java.util.stream.Collectors.collectingAndThen;
import static java.util.stream.Collectors.toCollection;

 1   public static void main(String[] args) {
     Milk milk0=new Milk(0,"123456");
     Milk milk1=new Milk(1,"123476");
     Milk milk2=new Milk(0,"876433");
     List<Milk> list=new ArrayList<>();
     list.add(milk0);
     list.add(milk1);
     list.add(milk2);
     //去重
     List<Milk> uniqueMilk = list.stream().collect(
         collectingAndThen(
             toCollection(() -> new TreeSet<>(comparing(n->n.getKey()))),ArrayList::new)
     );

     for (Milk m:uniqueMilk) {
       System.out.println(m.toString());
     }

   }

public class Milk {
  private Integer key;
  private String value;

  public Milk(Integer key, String value) {
    this.key = key;
    this.value = value;
  }

  public Integer getKey() {
    return key;
  }

  public void setKey(Integer key) {
    this.key = key;
  }

  public String getValue() {
    return value;
  }

  public void setValue(String value) {
    this.value = value;
  }

  @Override
  public String toString() {
    return "Milk{" + "key=" + key + ", value='" + value + '\'' + '}';
  }
}