List去重复——多个复杂字段判断去重

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
	 * @author : shijing
	 * 2017年6月2日上午11:28:20
	 * @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;  
	    }  
	}
	
}

去除重复后新集合：
姓名：张三，年龄：18，分数：35.6
姓名：李四，年龄：30，分数：85
姓名：赵六，年龄：25，分数：66.55