List对象集合根据指定属性去重

如题 为了记录删除List内重复数据方法

比较简单,只是重写了equals方法,直接贴代码

public class Demo {
    
    
    /**
     * 创建测试数据
     */
    private static List<User> list = Arrays.asList(
            new User("猪场", BigDecimal.valueOf(88.88), "英语"),
            new User("鹅厂", BigDecimal.valueOf(85), "数学"),
            new User("狗厂", BigDecimal.valueOf(77.99), "语文"),
            new User("狗厂", BigDecimal.valueOf(77.99), "语文"),
            new User("猪场", BigDecimal.valueOf(88.88), "英语"));

    public static void main(String[] args) {
    
    
        // 去重
        getDeleteRepeatList(list);
    }

    /**
     * 去除List内复杂字段重复对象
     * 
     * @param oldList
     * @return
     */
    private static List<User> getDeleteRepeatList(List<User> oldList){
    
    
        List<User> list = new ArrayList<User>();
        if(CollectionUtils.isNotEmpty(oldList)){
    
    
            for (User user : oldList) {
    
    
                // list去重复,重写equals
                if(!list.contains(user)){
    
    
                    list.add(user);
                }
            }
        }

        // 输出新的集合
        System.out.println("删除重复后数据：");
        if(CollectionUtils.isNotEmpty(list)){
    
    
            for (User user : list) {
    
    
                System.out.println(user.toString());
            }
        }
        return list;
    }

    static class User{
    
    
        private String userName;
        private BigDecimal score;
        private String name;
        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 String getAge() {
    
    
            return name;
        }
        public void setAge(String age) {
    
    
            this.name = name;
        }
        public User(String userName, BigDecimal score, String name) {
    
    
            super();
            this.userName = userName;
            this.score = score;
            this.name = name;
        }
        public User() {
    
    }

        @Override
        public String toString() {
    
    
            return "姓名："+ this.userName + "，科目：" + this.name + "，分数：" + this.score;
        }

        /**
         * 重写equals方法
         */
        @Override
        public boolean equals(Object obj) {
    
    
            if (obj == null) {
    
    
                return false;
            }
            if (this == obj) {
    
    
                return true;
            }
            User user = (User) obj;
            if (this.getAge() .compareTo(user.getAge())==0
                    && this.getUserName().equals(user.getUserName())
                    && this.getScore().compareTo(user.getScore())==0) {
    
    
                return true;
            }
            return false;
        }
    }
}

执行前数据

执行后数据