arraylist remove element in java

How to remove element from arraylist in java

// Java.util.ArrayList.remove(Object) method example
import java.util.ArrayList;
import java.util.List;
public class ArrayListRemoveObjectMethod
{
   public static void main(String[] args)
   {
      List<Integer> al = new ArrayList<>();
      al.add(56);
      al.add(28);
      al.add(39);
      al.add(59);
      al.add(82);
      System.out.println("Before using ArrayList.remove(Object) method size of ArrayList: " + al);
      // removes element 56
      al.remove(new Integer(56));
      // removes element 28
      al.remove(new Integer(28));
      System.out.println("After using ArrayList.remove(Object) method size of ArrayList: " + al);
   }
}

Posted by: Guest on December-01-2020

Source

//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");

// Given a list of Integers 1, 2, 3, 4, 5, 6 ....etc. remove all values greater than 100. public static void main(String[] args) { ArrayList<Integer>list1=new ArrayList<>(Arrays.asList(1,2,3,50,70,80,120,150,200)); ArrayList<Integer>list2 = new ArrayList<>(); for(int each : list1) if(each<100) list2.add(each); list1 = list2; System.out.println(list1); // [1, 2, 3, 50, 70, 80] }

// Java.util.ArrayList.remove(Object) method example import java.util.ArrayList; import java.util.List; public class ArrayListRemoveObjectMethod { public static void main(String[] args) { List<Integer> al = new ArrayList<>(); al.add(56); al.add(28); al.add(39); al.add(59); al.add(82); System.out.println("Before using ArrayList.remove(Object) method size of ArrayList: " + al); // removes element 56 al.remove(new Integer(56)); // removes element 28 al.remove(new Integer(28)); System.out.println("After using ArrayList.remove(Object) method size of ArrayList: " + al); } }

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