arraylist deleteAll

ArrayList removeAll(Collection c) method in java

import java.util.ArrayList;
public class ArrayListRemoveAllExample
{
   public static void main(String[] args)
   {
      try
      {
         ArrayList<Integer> al1 = new ArrayList<Integer>();
         al1.add(2);
         al1.add(4);
         al1.add(6);
         al1.add(8);
         al1.add(10);
         System.out.println("ArrayList before using removeAll() method: " + al1);
         // create another ArrayList
         ArrayList<Integer> al2 = new ArrayList<Integer>();
         al2.add(2);
         al2.add(4);
         al2.add(6);
         // print al2
         System.out.println("Elements to be removed: " + al2);
         // remove elements from ArrayList using removeAll() method
         al1.removeAll(al2);
         // print al1
         System.out.println("ArrayList after using removeAll() method: " + al1);
      }
      catch(NullPointerException ex)
      {
         System.out.println("Exception: " + ex);
      }
   }
}

Posted by: Guest on October-30-2020

Source

import java.util.ArrayList; public class ArrayListRemoveAllExample { public static void main(String[] args) { try { ArrayList<Integer> al1 = new ArrayList<Integer>(); al1.add(2); al1.add(4); al1.add(6); al1.add(8); al1.add(10); System.out.println("ArrayList before using removeAll() method: " + al1); // create another ArrayList ArrayList<Integer> al2 = new ArrayList<Integer>(); al2.add(2); al2.add(4); al2.add(6); // print al2 System.out.println("Elements to be removed: " + al2); // remove elements from ArrayList using removeAll() method al1.removeAll(al2); // print al1 System.out.println("ArrayList after using removeAll() method: " + al1); } catch(NullPointerException ex) { System.out.println("Exception: " + ex); } } }

//create ArrayList ArrayList<String> arrayList = new ArrayList<String>(); //add item to ArrayList arrayList.add("item"); //check if ArrayList contains item (returns boolean) System.out.println(arrayList.contains("item")); //remove item from ArrayList arrayList.remove("item");

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