How to remove Duplicate values in ArrayList?

Question

Now:

I want:

Code:

String[] contact = new String[contact_phoneList.size()];
for (int i = 0; i < contact_phoneList.size(); i++) {
    contact [i] = contact_phoneList.get(i);
}

or https://stackoverflow.com/questions/13912004/remove-duplicates-from-integer-array, or https://stackoverflow.com/questions/10056729/java-remove-duplicates-from-an-array and even https://stackoverflow.com/questions/357421/what-is-the-best-way-to-remove-duplicates-in-an-array-in-java — jhamon, Sep 19 '18 at 08:35
Just use a `Set` and you'll be fine, or `contact_phoneList.stream().distinct().toArray(String[]::new);` — PPartisan, Sep 19 '18 at 08:35

score 3 · Accepted Answer · edited Sep 19 '18 at 09:19

3

Use HashSet to remove duplicate values:

HashSet hs = new HashSet();
hs.addAll(contact_phoneList); // name of contact_phoneList from which you want to remove duplicates 
contact_phoneList.clear();
contact_phoneList.addAll(hs);

No need for a for loop

edited Sep 19 '18 at 09:19

achAmháin

4,176
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answered Sep 19 '18 at 08:50

Faiz Mir

599
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It worked. Thank you so much. You are the best ^^ – MmmmBbbbbbbbbbbbbbbbbbbb Sep 19 '18 at 09:02
Welcome.......:) – Faiz Mir Sep 19 '18 at 09:04

How to remove Duplicate values in ArrayList?

1 Answers1