beginnersbook.com

  • Home
  • All Tutorials
    • Learn Servlet
    • Learn JSP
    • Learn JSTL
    • Learn C
    • Learn C++
    • Learn MongoDB
    • Learn XML
    • Learn Python
    • Learn Perl
    • Learn Kotlin
  • Core Java
  • OOPs
  • Collections
  • Java I/O
  • JSON
  • DBMS

Java ArrayList contains() Method example

By Chaitanya Singh | Filed Under: Java Collections

ArrayList contains() method is used for checking the specified element existence in the given list.

public boolean contains(Object element)

It returns true if the specified element is found in the list else it gives false.

Example

In this example we have two array lists (ArrayList<String> and ArrayList<Integer>) and we are checking the existence of few elements in both the lists.

package beginnersbook.com;
import java.util.ArrayList;
public class ContainsExample {
   public static void main(String[] args) {

      ArrayList<String> al = new ArrayList<String>();
      al.add("pen");
      al.add("pencil");
      al.add("ink");
      al.add("notebook");

      System.out.println("ArrayList contains the string 'ink pen': "
                                           +al.contains("ink pen"));
      System.out.println("ArrayList contains the string 'pen': "
                                             +al.contains("pen"));
      System.out.println("ArrayList contains the string 'pencil': "
                                          +al.contains("pencil"));
      System.out.println("ArrayList contains the string 'book': "
                                           +al.contains("book"));

      ArrayList<Integer> al2 = new ArrayList<Integer>();
      al2.add(1);
      al2.add(99);
      al2.add(56);
      al2.add(13);
      al2.add(44);
      al2.add(6);

      System.out.println("'1' is present in arraylist: "+al2.contains(1));
      System.out.println("'55' is present in arraylist: "+al2.contains(55));
      System.out.println("'44' is there in arraylist: "+al2.contains(44));
      System.out.println("'7' is there in arraylist: "+al2.contains(7));
   }
}

Output:

ArrayList contains the string 'ink pen': false
ArrayList contains the string 'pen': true
ArrayList contains the string 'pencil': true
ArrayList contains the string 'book': false
'1' is present in arraylist: true
'55' is present in arraylist: false
'44' is there in arraylist: true
'7' is there in arraylist: false

Reference:

http://docs.oracle.com/javase/6/docs/api/java/util/ArrayList.html#contains(java.lang.Object)

Enjoyed this post? Try these related posts

  1. Java ArrayList indexOf() Method example
  2. How to get the Sub Map from TreeMap example – Java
  3. Java – Get element from specific index of LinkedList example
  4. How to get sub list of Vector example in java
  5. Java ArrayList set() Method example
  6. ArrayList in java with example programs – Collections Framework

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

ArrayList Tutorial

  • Java ArrayList

Java ArrayList Methods

  • add(Object obj)
  • add(int index, Object element)
  • addAll(Collection c)
  • addAll(int index, Collection c)
  • contains()
  • get()
  • indexOf()
  • ensureCapacity()
  • isEmpty()
  • lastIndexOf()
  • remove()
  • remove(Object obj)
  • trimToSize()
  • set()
  • clone()
  • clear()
  • size()

Copyright © 2012 – 2021 BeginnersBook . Privacy Policy . Sitemap