import java.util.ArrayList;

class KW 
{
    public static void main(String[] args) 
    {
        //ArrayList class implements the List interface
        ArrayList<String> al=new ArrayList<>();
        al.add("Apple");
        al.add("Orange");
        al.add("Mango");
        al.add("Grapes");
        al.add("Cherry");
        al.add("Apple");
        System.out.println(al);
        System.out.println("Size: "+al.size());
    }
}

kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
[Apple, Orange, Mango, Grapes, Cherry, Apple]
Size: 6
kodingwindow@kw:~$ 

import java.util.ArrayList;

class KW 
{
    public static void main(String[] args) 
    {
        //ArrayList class implements the List interface
        ArrayList<String> al=new ArrayList<>();
        al.add("Apple");
        al.add("Orange");
        al.add("Mango");
        al.add("Grapes");
        al.add("Cherry");
        al.add("Apple");
        for(String s:al)
        {
            System.out.println(s);
        }
        System.out.println("\n"+al.get(3));
        System.out.println(al.indexOf("Apple"));
        System.out.println(al.lastIndexOf("Apple"));
    }
}

kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
Apple
Orange
Mango
Grapes
Cherry
Apple

Grapes
0
5
kodingwindow@kw:~$ 

import java.util.ArrayList;

class KW 
{
    public static void main(String[] args) 
    {
        //ArrayList class implements the List interface
        ArrayList<String> al=new ArrayList<>();
        al.add("Apple");
        al.add("Orange");
        al.add("Mango");
        al.add("Grapes");
        al.add("Cherry");
        al.add("Apple");
        System.out.println(al);
        System.out.println(al.subList(2, 4));
        al.set(0, "Pineapple");
        System.out.println(al);
    }
}

kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
[Apple, Orange, Mango, Grapes, Cherry, Apple]
[Mango, Grapes]
[Pineapple, Orange, Mango, Grapes, Cherry, Apple]
kodingwindow@kw:~$ 

import java.util.ArrayList;

class KW 
{
    public static void main(String[] args) 
    {
        //ArrayList class implements the List interface
        ArrayList<String> al1=new ArrayList<>();
        al1.add("Apple");
        al1.add("Orange");
        al1.add("Mango");
        al1.add("Grapes");
        al1.add("Cherry");
        System.out.println(al1);
        
        ArrayList<String> al2=new ArrayList<>();
        al2.add("Strawberry");
        al2.add("Pineapple");
        System.out.println(al2);
        
        al1.addAll(al2);
        System.out.println(al1);
        System.out.println(al1.containsAll(al2));
    }
}

kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
[Apple, Orange, Mango, Grapes, Cherry]
[Strawberry, Pineapple]
[Apple, Orange, Mango, Grapes, Cherry, Strawberry, Pineapple]
true
kodingwindow@kw:~$  

import java.util.ArrayList;

class KW 
{
    public static void main(String[] args) 
    {
        //ArrayList class implements the List interface
        ArrayList<String> al=new ArrayList<>();
        al.add("Apple");
        al.add("Orange");
        al.add("Mango");
        al.add("Grapes");
        al.add("Cherry");
        al.add("Apple");
        System.out.println(al);
        
        //al.remove() //Without arguments its error in ArrayList
        al.remove(2);
        System.out.println(al);
        al.remove("Apple");
        System.out.println(al);
        
        al.removeAll(al); //al.clear();
        if(al.isEmpty())
        {
            System.out.println("List is empty now");
        }
    }
}

kodingwindow@kw:~$ javac KW.java
kodingwindow@kw:~$ java KW
[Apple, Orange, Mango, Grapes, Cherry, Apple]
[Apple, Orange, Grapes, Cherry, Apple]
[Orange, Grapes, Cherry, Apple]
List is empty now
kodingwindow@kw:~$