Question

我在数组列表中有很多对象。有一些重复。我想从中删除重复项。我尝试使用下面的代码。

下面是我的PhoneContacts模型类

public class PhoneContactsModel  {
private boolean isChecked;
String contactName;
String contactNumber;

public PhoneContactsModel(String contactName, String contactNumber, boolean isChecked) {
    this.contactName = contactName;
    this.contactNumber = contactNumber;
    this.isChecked = isChecked;
}


protected PhoneContactsModel(Parcel in) {
    isChecked = in.readByte() != 0;
    contactName = in.readString();
    contactNumber = in.readString();
}



@Override
public boolean equals(Object o) {
    if (this == o) return true;
    if (!(o instanceof PhoneContactsModel)) return false;

    PhoneContactsModel class1 = (PhoneContactsModel) o;

    return contactNumber.equals(class1.contactNumber);
}

@Override
public int hashCode() {
    return contactNumber.hashCode();
}


public boolean isChecked() {
    return isChecked;
}

public void setChecked(boolean checked) {
    isChecked = checked;
}

public String getContactName() {
    return contactName;
}

public void setContactName(String contactName) {
    this.contactName = contactName;
}

public String getContactNumber() {
    return contactNumber;
}

public void setContactNumber(String contactNumber) {
    this.contactNumber = contactNumber;
}

}

我尝试了下面的树集

public ArrayList<PhoneContactsModel> removeDuplicates(ArrayList<PhoneContactsModel> list) {

    Set set = new TreeSet(new Comparator() {

        @Override
        public int compare(Object o1, Object o2) {
            if (((PhoneContactsModel) o1).getContactNumber().equalsIgnoreCase(((PhoneContactsModel) o2).getContactNumber())) {
                return 0;
            }
            return 1;
        }
    });
    set.addAll(list);
    list.clear();

    final ArrayList newList = new ArrayList(set);
    return newList;
}

我想根据电话号码过滤该arrayList。但即使我使用HashSet，我也没有任何变化。请帮助我任何建议，如果我做错了什么。任何建议都被接受了。

Answer 1

试试这个，

实体班PhoneContactsModel

public class PhoneContactsModel implements Parcelable{
    private boolean isChecked;
    String contactName;
    String contactNumber;

    public PhoneContactsModel(String contactName, String contactNumber, boolean isChecked) {
        this.contactName = contactName;
        this.contactNumber = contactNumber;
        this.isChecked = isChecked;
    }


    protected PhoneContactsModel(Parcel in) {
        isChecked = in.readByte() != 0;
        contactName = in.readString();
        contactNumber = in.readString();
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeByte((byte) (isChecked ? 1 : 0));
        dest.writeString(contactName);
        dest.writeString(contactNumber);
    }

    @Override
    public int describeContents() {
        return 0;
    }

    public static final Creator<PhoneContactsModel> CREATOR = new Creator<PhoneContactsModel>() {
        @Override
        public PhoneContactsModel createFromParcel(Parcel in) {
            return new PhoneContactsModel(in);
        }

        @Override
        public PhoneContactsModel[] newArray(int size) {
            return new PhoneContactsModel[size];
        }
    };

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof PhoneContactsModel)) return false;

        PhoneContactsModel class1 = (PhoneContactsModel) o;

        return contactNumber.equals(class1.contactNumber);
    }

    @Override
    public int hashCode() {
        return contactNumber.hashCode();
    }


    public boolean isChecked() {
        return isChecked;
    }

    public void setChecked(boolean checked) {
        isChecked = checked;
    }

    public String getContactName() {
        return contactName;
    }

    public void setContactName(String contactName) {
        this.contactName = contactName;
    }

    public String getContactNumber() {
        return contactNumber;
    }

    public void setContactNumber(String contactNumber) {
        this.contactNumber = contactNumber;
    }


}

删除重复项

   // I have added some dummy data
   ArrayList<PhoneContactsModel> phoneContactsModelArrayList = new ArrayList<>();
        phoneContactsModelArrayList.add(new PhoneContactsModel("User","123456789",true));
        phoneContactsModelArrayList.add(new PhoneContactsModel("User","123456789",true));
        phoneContactsModelArrayList.add(new PhoneContactsModel("User","123456789",true));
        phoneContactsModelArrayList.add(new PhoneContactsModel("User1","123456788",true));
        phoneContactsModelArrayList.add(new PhoneContactsModel("User2","123456787",true));
        phoneContactsModelArrayList.add(new PhoneContactsModel("User3","123456786",true));


        //uniques list
        List<PhoneContactsModel> result = new ArrayList<PhoneContactsModel>();
        // to just remove duplicates
        Set<String> numbers= new HashSet<String>();

        for( PhoneContactsModel phoneContactsModel: phoneContactsModelArrayList ) {
            if( numbers.add( phoneContactsModel.getContactNumber() )) {
                result.add( phoneContactsModel);
            }
        }

从对象数组中删除重复项

1 个答案: