Check whether an array list contains a value more than once in android

Question

I have an arraylist in which i am storing a list of values. I have to check whether the list contains the same value more than once..And i need only the non-repeating values.. How can i check the number of existences of a value in array list??

Thanks in advance..

http://stackoverflow.com/questions/562894/java-detect-duplicates-in-arraylist — Raghunandan, Oct 27 '12 at 05:32
@Raghunandan : thanks.. but i need the duplicate value.. how can i get that.. — Deepzz, Oct 27 '12 at 05:35
http://stackoverflow.com/questions/7281352/finding-duplicate-values-in-arraylist — Raghunandan, Oct 27 '12 at 05:37

score 1 · Answer 1 · answered Oct 27 '12 at 05:59

1

use

public static int frequency(Collection c, Object o)

to get frequency of an object in a collection(arraylist).

answered Oct 27 '12 at 05:59

jeet

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score 1 · Accepted Answer · answered Oct 27 '12 at 06:21

1

Here is how you can do it:

 ArrayList<String>numbers= new ArrayList<String>();

numbers.add("1");
numbers.add("2");
numbers.add("1");
numbers.add("3");


int count= Collections.frequency(numbers, "1");

In this way count returns 2.

answered Oct 27 '12 at 06:21

AppMobiGurmeet

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Check whether an array list contains a value more than once in android

2 Answers2