Getting same value while comparing 2 arraylist

Question

I can able to fetch json response , added response in arraylist
When i try to compare 2 arraylist , arraylist2 value is not changing.
what i have done :

json parsing :

for (int i = 0; i < array.length(); i++) {
                    JSONObject obj = array.getJSONObject(i);
                    id = obj.getString("alert_id");


                    map.put("alert_id", id);

                    Log.d("map", map.toString());
                    arraylist1.add(map);

                       Log.e("asdasd", arraylist1.toString());
                }

- Comparision :

for (int i = 0; i < arraylist.size(); i++) {
                for (int j = 0; j < arraylist1.size(); j++) {
                    if (!(arraylist.get(i).get("id")).equals((arraylist1.get(j).get("id")))) {
                        //Checking whether the last value in the list..
                        if (j == (arraylist1.size() - 1)) {
                            unCommonList.add(arraylist.get(i).get("alert_id"));


                        } else {

                        }
                    }
                }
            }

-- Output :

-- Everytime arraylist2 remains same, arraylist1 is changing, but arraylist2 value is not

-- This is my arraylist2 :

[{abcd=100, id=79, createdate=2016-03-14 03:59:43, defge=2012310, 123123xyzw=alpha}, {abcd=11230, id=79, createdate=2016-03-14 03:59:43, defge=201231230, xyzw=alpasdha}, {abcd=10452430, id=79, createdate=2016-03-14 03:59:43, defge=12346, xyzw=alasdpha}, {abcd=1za00, id=79, createdate=2016-03-14 03:59:43, defge=212312300, xyzw=alpdsaha}, {abcd=112312300, id=79, createdate=2016-03-14 03:59:43, defge=21231200, xyzw=alpsqwha}, {abcd=123123, id=79, createdate=2016-03-14 03:59:43, defge=201231230, xyzw=alpqwreha}, {abcd=112312300, id=79, createdate=2016-03-14 03:59:43, defge=212312300, xyzw=alpyjha}, {abcd=101231230, id=79, createdate=2016-03-14 03:59:43, defge=200, xyzw=alpha}]

unCommonList.add(arraylist.get(j).get("alert_id"));

Nirav Ranpara
– Nirav Ranpara

2016-03-18 11:09:24 +00:00
Commented Mar 18, 2016 at 11:09 — Nirav Ranpara
– Nirav Ranpara, Commented Mar 18, 2016 at 11:09
You forgot what you want compare ? asc /desc?

Ajay Pandya
– Ajay Pandya

2016-03-18 11:09:46 +00:00
Commented Mar 18, 2016 at 11:09 — Ajay Pandya
– Ajay Pandya, Commented Mar 18, 2016 at 11:09
@Ajay Pandya , can u show demo ? plz

tiger
– tiger

2016-03-18 11:11:30 +00:00
Commented Mar 18, 2016 at 11:11 — tiger
– tiger, Commented Mar 18, 2016 at 11:11
@Nirav Ranpara , 2nd arraylist value is not changing.

tiger
– tiger

2016-03-18 11:12:03 +00:00
Commented Mar 18, 2016 at 11:12 — tiger
– tiger, Commented Mar 18, 2016 at 11:12
First i want to know what you want to achieve ?

Ajay Pandya
– Ajay Pandya

2016-03-18 11:12:15 +00:00
Commented Mar 18, 2016 at 11:12 — Ajay Pandya
– Ajay Pandya, Commented Mar 18, 2016 at 11:12

TUSHAR · Accepted Answer · 2016-03-18 11:23:06Z

1

for (int i = 0; i < arraylist.size(); i++) {
            for (int j = 0; j < arraylist1.size(); j++) {
                if (!(arraylist.get(i).get("id")).equals((arraylist1.get(j).get("id")))) {
                    //Checking whether the last value in the list..
                    if (j == (arraylist1.size() - 1)) {
                        unCommonList.add(arraylist.get(i).get("alert_id"));


                    } else {

                    }
                }else{
                           break;
                              }
            }
        }

answered Mar 18, 2016 at 11:23

TUSHAR

3371 silver badge10 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Ajay Pandya · Accepted Answer · 2016-03-18 11:28:24Z

1

Ok so for getting unmatch element you can try this code

ArrayList<Integer> results = new ArrayList<>();


for (Person person2 : arrayList2) {

    boolean found = false;
    for (Person person1 : arrayList1) {
    if (person2.id == person1.id) {
        found = true;
    }
}
if (!found) {
    results.add(person2.id);
}
}

answered Mar 18, 2016 at 11:28

Ajay Pandya

2,4574 gold badges31 silver badges68 bronze badges

7 Comments

tiger Over a year ago

what if my arraylist contains other elements also ?

Ajay Pandya Over a year ago

Same way found=true only if require elements found

Ajay Pandya Over a year ago

Have you try it with my code? because found boolean is vital for adding element.

tiger Over a year ago

have u seen my arraylist Log, every id is same

tiger Over a year ago

and what about this person2.id ? what should i mention here ?

|

Collectives™ on Stack Overflow

Getting same value while comparing 2 arraylist

2 Answers 2

Comments

7 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

7 Comments

Your Answer

Sign up or log in

Post as a guest

Related