Java Proficiency: How to Remove List From Arraylist

Sunday, 10 May 2015

We can remove all element of list from arraylist using removeAll().

import java.util.ArrayList;
import java.util.List;

public class RemoveList {

   public static void main(String[] args) {
       ArrayList<String> arr = new ArrayList<String>();
       // add element in arraylist
       arr.add("c");
       arr.add("php");
       arr.add("html");
       arr.add("java");
       // print arraylist
       System.out.println(" berfore remove arrayList is = " + arr);

       List<String> brr = new ArrayList<String>();
       brr.add("php");
       brr.add("java");

       /*
       * Removes from this list all of its elements that are
           contained in the specified collection.
       */

       arr.removeAll(brr);

       System.out.println("after remove arraylist is = "+arr);

   }

}

Output:

berfore remove arrayList is = [c, php, html, java]

after remove arraylist is = [c, html]

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