Arraylist.contains() Method in Java Last Updated : 10 Dec, 2024 Summarize Suggest changes Share Like Article Like Report In Java, the ArrayList contains() method is used to check if the specified element exists in an ArrayList or not. Example: Here, we will use the contains() method to check if the ArrayList of Strings contains a specific element. Java // Java program to demonstrate the use of contains() // method with ArrayList of Strings import java.util.ArrayList; public class GFG { public static void main(String[] args) { // Create an ArrayList of Strings ArrayList<String> s = new ArrayList<>(); s.add("Apple"); s.add("Blueberry"); s.add("Strawberry"); // Check if "Grapes" exists in the ArrayList System.out.println(s.contains("Grapes")); // Check if "Apple" exists in the ArrayList System.out.println(s.contains("Apple")); } } Outputfalse true Syntax of ArrayList.contains() Methodpublic boolean contains(Object o)Parameter: o: The element whose presence in the ArrayList is to be tested.Returns: It returns true if the specified element is found in the list else it returns false.Other Examples of Java ArrayList.contains() Example 2: Here, we are using the contains() method to check if the ArrayList of Integers contains a specific number. Java // Java program to demonstrate the use of contains() // method with ArrayList of Integers import java.util.ArrayList; public class GFG { public static void main(String[] args) { // Create an ArrayList of Integers ArrayList<Integer> arr = new ArrayList<>(); arr.add(10); arr.add(20); arr.add(30); // Check if 20 exists in the ArrayList System.out.println(arr.contains(20)); // Check if 40 exists in the ArrayList System.out.println(arr.contains(40)); } } Outputtrue false Example 3: Here, we are using contains() method to verify if the ArrayList of Strings contains a specific name. Java // Java program to demonstrate the use of contains() // method with ArrayList of Strings (Names) import java.util.ArrayList; public class GFG { public static void main(String[] args) { // Create an ArrayList of Strings ArrayList<String> s = new ArrayList<>(); s.add("Ram"); s.add("Shyam"); s.add("Gita"); // Check if "Hari" exists in the ArrayList System.out.println(s.contains("Hari")); // Check if "Ram" exists in the ArrayList System.out.println(s.contains("Ram")); } } Outputfalse true Advertise with us Next Article ArrayList ensureCapacity() Method in Java with Examples S Striver Follow Similar Reads ArrayList in Java Java ArrayList is a part of the collections framework and it is a class of java.util package. It provides us with dynamic-sized arrays in Java. The main advantage of ArrayList is that, unlike normal arrays, we don't need to mention the size when creating ArrayList. 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