list intersection java

list intersection java

I have two arraylists and I want intersection (means, common elements in both arraylists).

Refer this link,

http://stackoverflow.com/questions/2400838/efficient-intersection-of-two-liststring-in-java

http://www.devmanuals.com/tutorials/java/collections/ListRetainAll.html

retainAll() can be used to achieve this.

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

big.add("1");

big.add("2");

big.add("3");

big.add("4");

big.add("5");

big.add("6");

 

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

small.add("1");

small.add("2");

small.add("3");

boolean b=big.retainAll(small);