前些天发现了一个巨牛的人工智能学习网站，通俗易懂，风趣幽默，忍不住分享一下给大家。点击跳转到教程。

一、实体类中要重写比较方法equals，最好也重写hashcode方法

public class WorkWeightDto implements Serializable {private static final long serialVersionUID = 8245791221237374426L;//    @Id  没有加id自增长策略 会影响到别的实体数据插入。private String id;private String projectId; //　项目Idprivate String projectName; //　项目    private String startTime; // 开始时间private String endTime; // 结束时间   private String managerId; // 负责人Idpublic WorkWeightDto() {}public WorkWeightDto(String id, String projectId, String startTime) {this.id = id;this.projectId = projectId;this.startTime = startTime;}@Overridepublic boolean equals(Object o) {if (this == o) return true;if (o == null || getClass() != o.getClass()) return false;WorkWeightDto ww = (WorkWeightDto) o;if (id.equals(ww.getId()) && projectId.equals(ww.getProjectId()) && startTime.equals(ww.getStartTime())){return true;}return false;}@Overridepublic int hashCode() {return id.hashCode() + projectId.hashCode()+startTime.hashCode();}

 

二、去重方法实现

 

 private List<WorkWeightDto> deleteSame(List<WorkWeightDto> dtoList){Iterator<WorkWeightDto> it = dtoList.iterator();WorkWeightDto next =null;List<WorkWeightDto> newList = new ArrayList<WorkWeightDto>();while(it.hasNext()){next = it.next();if(!newList.contains(next)){newList.add(next);}}return  newList;}

三、其它方法参见：集合去重方法A  、 集合去重方法B