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..

Answer 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.