remove an element from an arraylist code example

Example 1: 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);
   }
}

Example 2: How to remove element from arraylist in java

// java program on ArrayList remove(int index) method example
import java.util.ArrayList;
import java.util.List;
public class ArrayListRemoveIndex
{
   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(int index) method: " + al);
      // removes element 28
      al.remove(1);
      // element 39 is now moved one position back
      // So element 39 is removed
      al.remove(1);
      System.out.println("After using ArrayList.remove(int index) method: " + al);
   }
}

Example 3: java arraylist remove

//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");