Java Arraylist contains() Function
What is an ArrayList?
Arraylist is a part of collection framework in java. It contains some inbuilt function like contains function which can be found in the java.util.ArrayList Package.
It implements the List interface of the collections framework.
Here, in the page we will discuss about the ArrayList’s contains() Method in java.
ArrayList contains Function:
Arraylist contains several inbuilt functions that are used to perform several operations in of arraylist in Java. contains() function is also an inbuilt method of class ArrayList.
contains() method is used to checks whether the given element is present in the arraylist or not.
Syntax:
arraylist_name.contains(element)
Definition of Parameters:
Return Type :
Example:
clear() Function in ArrayList
clone() Function in ArrayList
add() Function in ArrayList
addall() Function in ArrayList
import java.util.*;
public class Main{
public static void main(String[] args) {
// Initializing the arraylist
ArrayList PrepInsta = new ArrayList<>();
// Adding Elements to the ArrayList
PrepInsta.add(10);
PrepInsta.add(20);
PrepInsta.add(30);
// Printing the ArrayList
System.out.println("ArrayList: " + PrepInsta);
// Contains Function for true value
System.out.println("Is 10 Present in the ArrayList : " + PrepInsta.contains(20));
// Contains Function for false value
System.out.println("Is 40 Present in the ArrayList : " + PrepInsta.contains(40));
}
}
Output: ArrayList: [10, 20, 30] Is 10 Present in the ArrayList : true Is 40 Present in the ArrayList : false
In the above code we had taken an integer ArrayList with some integer elements, then we checked for the elements ’10’ and ’40’ in the ArrayList whether they are present in the given ArrayList or not. It returns true for 10 and false for 40.
Example for Different Data Type:
import java.util.*;
public class Main{
public static void main(String[] args) {
// Initializing the arraylist
ArrayList PrepInsta = new ArrayList<>();
// Adding Elements to the ArrayList
PrepInsta.add("Lakshit");
PrepInsta.add("Rishikesh");
PrepInsta.add("Rishik");
// Printing the ArrayList
System.out.println("ArrayList: " + PrepInsta);
// Contains Function for true value
System.out.println("Is Lakshit Present in the ArrayList : "
+ PrepInsta.contains("Lakshit"));
// Contains Function for false value
System.out.println("Is Insta Present in the ArrayList : "
+ PrepInsta.contains("Insta"));
}
}
Output: ArrayList: [Lakshit, Rishikesh, Rishik] Is Lakshit Present in the ArrayList : true Is Insta Present in the ArrayList : false
In the above Example. we add 3 elements to an arraylist of string type and we are searching for the elements for one true and one false value.
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