Java ArrayList containsAll() Method with Example

In the previous article we have discussed about Java ArrayList contains() Method with Example

In this article we are going to see the use Java ArrayList containsAll() method along with suitable examples.

Java ArrayList containsAll() Method with Example

containsAll():

This java.util.ArrayList.containsAll() method is used to checks if all the elements of a specified collection is present in the arraylist or not.

It returns true if all the elements are present else it returns false.

Syntax:

arrayListName.containsAll(Collection Col)

Where,

arrayListName refers to the name of your ArrayList.
Collection col refers to specified collection, whose elements will be checked in another arraylist.

Let’s see different examples to understand it more clearly.

Example with String Type ArrayList
Example with Integer Type ArrayList

Method-1: Java ArrayList containsAll() Method – Example with String Type ArrayList

Approach:

Create a new ArrayList of type String.
Add string elements into the ArrayList using the add() method.
Display the ArrayList elements.
Now, using the containsAll() method we can check if all the element are present or not in the arrayList.
Print the result as true/false.

Program:

import java.util.*;
public class Main
{
    public static void main(String[] args)
    {
        // Create an ArrayList of string datatype
        ArrayList<String> arr = new ArrayList<String>();
        // Adding some elements to the ArrayList
        arr.add("vivo");
        arr.add("samsung");
        arr.add("nokia");
        // Prints the ArrayList elements
        System.out.println("The elements of ArrayList 1 are: "+arr);
        // Create a ArrayList of string datatype
        ArrayList<String> arr1 = new ArrayList<String>();
        // Adding some elements to the ArrayList
        arr1.add("vivo");
        arr1.add("htc");
        arr1.add("samsung");
        arr1.add("realme");
        arr1.add("nokia");
        // Prints the ArrayList elements
        System.out.println("The elements of ArrayList 2 are: "+arr1);
        // check if it contains all the elements or not
        System.out.println("are all the elements of ArrayList 1 present in Arraylist 2: " +arr1.containsAll(arr));
        System.out.println("are all the elements of ArrayList 2 present in Arraylist 1: " +arr.containsAll(arr1));
    }
}

Output:

The elements of ArrayList 1 are: [vivo, samsung, nokia]
The elements of ArrayList 2 are: [vivo, htc, samsung, realme, nokia]
are all the elements of ArrayList 1 present in Arraylist 2: true
are all the elements of ArrayList 2 present in Arraylist 1: false

Method-2: Java ArrayList containsAll() Method – Example with Integer Type ArrayList

Approach:

Create a new ArrayList of type Integer.
Add Integer elements into the ArrayList using the add() method.
Display the ArrayList elements.
Now, using the containsAll() method we can check if all the element are present or not in the arrayList.
Print the result as true/false.

Program:

import java.util.*;
public class Main
{
    public static void main(String[] args)
    {  
        // Create an ArrayList of Integer datatype
        ArrayList<Integer> arr = new ArrayList<Integer>();
        // Adding some elements to the ArrayList
        arr.add(17);
        arr.add(1);
        // Prints the ArrayList elements
        System.out.println("The elements of ArrayList 1 are: "+arr);
        // Create a ArrayList of string datatype
        ArrayList<Integer> arr1 = new ArrayList<Integer>();
        // Adding some elements to the ArrayList
        arr1.add(1);
        arr1.add(100);
        arr1.add(84);
        arr1.add(17);
        arr1.add(0);
        // Prints the ArrayList elements
        System.out.println("The elements of ArrayList 2 are: "+arr1);
        // check if it contains all the elements or not
        System.out.println("are all the elements of ArrayList 1 present in Arraylist 2: " +arr1.containsAll(arr));
        System.out.println("are all the elements of ArrayList 2 present in Arraylist 1: " +arr.containsAll(arr1));
    }
}

Output:

The elements of ArrayList 1 are: [17, 1]
The elements of ArrayList 2 are: [1, 100, 84, 17, 0]
are all the elements of ArrayList 1 present in Arraylist 2: true
are all the elements of ArrayList 2 present in Arraylist 1: false

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