前些天發現了一個巨牛的人工智能學習網站，通俗易懂，風趣幽默，忍不住分享一下給大家。點擊跳轉到教程。
一、實體類中要重寫比較方法equals，最好也重寫hashcode方法
public class WorkWeightDto implements Serializable {private static final long serialVersionUID = 8245791221237374426L;// @Id 沒有加id自增長策略 會影響到別的實體數據插入。private String id;private String projectId; // 項目Idprivate String projectName; // 項目 private String startTime; // 開始時間private String endTime; // 結束時間 private String managerId; // 負責人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();}
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二、去重方法實現
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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、其它方法參見：集合去重方法A? 、?集合去重方法B
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