list去除重复对象 List集合多个复杂字段判断去重的案例

package com.test;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.commons.collections.CollectionUtils;
public class TestCollection {
 //去重复之前集合
 private static List<User> list = Arrays.asList(
  new User("张三", BigDecimal.valueOf(35.6), 18),
  new User("李四", BigDecimal.valueOf(85), 30),
  new User("赵六", BigDecimal.valueOf(66.55), 25),
  new User("赵六", BigDecimal.valueOf(66.55), 25),
  new User("张三", BigDecimal.valueOf(35.6), 18));
 public static void main(String[] args) {
 //排除重复
 getNoRepeatList(list);
 
 }
 /**
 * 去除List内复杂字段重复对象
 * @param oldList
 * @return
 */
 private static List<User> getNoRepeatList(List<User> oldList){
 List<User> list = new ArrayList<>();
 if(CollectionUtils.isNotEmpty(oldList)){
  for (User user : oldList) {
  //list去重复，内部重写equals
  if(!list.contains(user)){
   list.add(user);
  }
  }
 }
 //输出新集合
 System.out.println("去除重复后新集合：");
 if(CollectionUtils.isNotEmpty(list)){
  for (User user : list) {
  System.out.println(user.toString());
  }
 }
 return list; 
 } 
 static class User{
 private String userName; //姓名
 private BigDecimal score;//分数
 private Integer age;
 public String getUserName() {
  return userName;
 }
 public void setUserName(String userName) {
  this.userName = userName;
 }
 public BigDecimal getScore() {
  return score;
 }
 public void setScore(BigDecimal score) {
  this.score = score;
 }
 public Integer getAge() {
  return age;
 }
 public void setAge(Integer age) {
  this.age = age;
 }
 public User(String userName, BigDecimal score, Integer age) {
  super();
  this.userName = userName;
  this.score = score;
  this.age = age;
 }
 public User() {
  // TODO Auto-generated constructor stub
 }
 @Override
 public String toString() {
  // TODO Auto-generated method stub
  return "姓名："+ this.userName + "，年龄：" + this.age + "，分数：" + this.score;
 }
 /**
  * 重写equals,用于比较对象属性是否包含
  */
 public boolean equals(Object obj) { 
     if (obj == null) { 
       return false; 
     } 
     if (this == obj) { 
       return true; 
     } 
     User user = (User) obj; 
     //多重逻辑处理，去除年龄、姓名相同的记录
     if (this.getAge() .compareTo(user.getAge())==0
      && this.getUserName().equals(user.getUserName())
      && this.getScore().compareTo(user.getScore())==0) { 
       return true; 
     } 
     return false; 
   } 
 }
}