小编Mic*_*pes的帖子

我正在创建一个List,它将观察列表(注册注册,时间)转换为仅包含注册的列表,但是这个列表不能包含重复项,我正在努力确保不会发生重复.

public List<Registration> getVehicles(){
    List<Registration> rtnList = new ArrayList<Registration>();
    for (Observation obs:observationsList){
        if (rtnList.contains(obs.getIdentifier())){
        }
        else
            rtnList.add(obs.getIdentifier());
    }
    return rtnList;
}

这就是我所拥有的,但仍然会出现重复.

通过以下观察:

obsList.record (new Registration("CA 976-543"), new Time("13:15:03"));
obsList.record (new Registration("BCD 123 MP"), new Time("13:21:47"));
obsList.record (new Registration("CA 976-543"), new Time("13:35:50"));

Registration类的.equals()方法是:

public boolean equals(Registration other){
    if (getIdentifier().equals(other.getIdentifier()))
        return true;
    return false;
}

我想obsList.getVehicles的输出是:

[CA 976-543,BCD 123 MP]

但相反,我得到:

[CA 976-543,BCD 123 MP,CA 976-543]