Java ArrayList contains() Method with Example

Arraylist contains() method – Java ArrayList contains() Method with Example

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

In this article we are going to see the use ArrayList  contains() method along with suitable examples by using Java programming language.

Java ArrayList contains() Method with Example

contains( ):

Java arraylist contains: This java.util.ArrayList.contains() method is used to check if the specified element in the arraylist is present or not.

It returns true if that specific element is present else it returns false

Syntax:

arrayListName.contains()

Where,

  • arrayListName refers to the name of your 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 contains() 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 contains( ) method you can check if the desired element is 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("Hello");
        arr.add("this");
        arr.add("is");
        arr.add("an");
        arr.add("example of contains() method");
        // Prints the ArrayList elements
        System.out.println("The elements of ArrayList are: "+arr);
        // checking specific elements in the arrayList
        System.out.println("Is Hello present in the arraylist: "+arr.contains("Hello"));
        System.out.println("Is hello present in the arraylist: "+arr.contains("hello"));
    }
}

Output:

The elements of ArrayList are: [Hello, this, is, an, example of contains() method]
Is Hello present in the arraylist: true
Is hello present in the arraylist: false

Method-2: Java ArrayList contains() 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 contains( ) method you can check if the desired element is 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(10);
        arr.add(9);
        arr.add(8);
        arr.add(7);
        arr.add(6);
        // Prints the ArrayList elements
        System.out.println("The elements of ArrayList are: "+arr);
        // checking specific elements in the arrayList
        System.out.println("Is 9 present in the arraylist: "+arr.contains(9));
        System.out.println("Is 99 present in the arraylist: "+arr.contains(99));
    }
}
Output:

The elements of ArrayList are: [10, 9, 8, 7, 6]
Is 9 present in the arraylist: true
Is 99 present in the arraylist: false

Are you wondering how to seek help from subject matter experts and learn the Java language? Go with these Basic Java Programming Examples and try to code all of them on your own then check with the exact code provided by expert programmers.

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