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I have to find a best way to find out that elements which is not presented in the second arraylist. suppose
Arraylist a,b, Arraylist a={1,2,3,4,5}; Arraylist b={2,3,4}; So basically what I want is to find out that elements of a which is not present in arraylist b.
So what is the best solutions to do that?
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ArrayList contains() method in Java is used for checking if the specified element exists in the given list or not. Returns: It returns true if the specified element is found in the list else it returns false.
ArrayList. contains() method can be used to check if an element exists in an ArrayList or not. This method has a single parameter i.e. the element whose presence in the ArrayList is tested. Also it returns true if the element is present in the ArrayList and false if the element is not present.
The containsAll() method of List interface in Java is used to check if this List contains all of the elements in the specified Collection. So basically it is used to check if a List contains a set of elements or not.
List<Integer> c = new ArrayList<>(a); c.removeAll(b); Also consider to use Sets instead of Lists.
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