how to remove an element from an arraylist java

1// java program on ArrayList remove(int index) method example
2import java.util.ArrayList;
3import java.util.List;
4public class ArrayListRemoveIndex
5{
6   public static void main(String[] args)
7   {
8      List<Integer> al = new ArrayList<>();
9      al.add(56);
10      al.add(28);
11      al.add(39);
12      al.add(59);
13      al.add(82);
14      System.out.println("Before using ArrayList.remove(int index) method: " + al);
15      // removes element 28
16      al.remove(1);
17      // element 39 is now moved one position back
18      // So element 39 is removed
19      al.remove(1);
20      System.out.println("After using ArrayList.remove(int index) method: " + al);
21   }
22}

1// Java.util.ArrayList.remove(Object) method example
2import java.util.ArrayList;
3import java.util.List;
4public class ArrayListRemoveObjectMethod
5{
6   public static void main(String[] args)
7   {
8      List<Integer> al = new ArrayList<>();
9      al.add(56);
10      al.add(28);
11      al.add(39);
12      al.add(59);
13      al.add(82);
14      System.out.println("Before using ArrayList.remove(Object) method size of ArrayList: " + al);
15      // removes element 56
16      al.remove(new Integer(56));
17      // removes element 28
18      al.remove(new Integer(28));
19      System.out.println("After using ArrayList.remove(Object) method size of ArrayList: " + al);
20   }
21}

1//Create the ArrayList
2List<Integer> al = new ArrayList<>(); 
3//Add the items
4al.add(10);
5al.add(18);
6//Remove item(1 = 2and item in list)
7al.remove(1); 

1//create ArrayList
2ArrayList<String> arrayList = new ArrayList<String>();
3//add item to ArrayList
4arrayList.add("item");
5//check if ArrayList contains item (returns boolean)
6System.out.println(arrayList.contains("item"));
7//remove item from ArrayList
8arrayList.remove("item");

1// Java program to demonstrate working of remove 
2// on an integer arraylist 
3import java.util.List; 
4import java.util.ArrayList; 
5  
6public class GFG 
7{ 
8    public static void main(String[] args) 
9    { 
10        List<Integer> al = new ArrayList<>(); 
11        al.add(10); 
12        al.add(30); 
13        al.add(1); 
14        al.add(2); 
15  
16        // This makes a call to remove(int) and  
17        // removes element 20. 
18        al.remove(1); 
19          
20        // Now element 30 is moved one position back 
21        // So element 30 is removed this time 
22        al.remove(1); 
23  
24        System.out.println("Modified ArrayList : " + al); 
25    } 
26} 

1public E remove(int index)	// returns removed element at index