Arraylist.contains() Method in Java
Last Updated :
10 Dec, 2024
Improve
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 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"));
}
}
Output
false true
Syntax of ArrayList.contains() Method
public 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 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));
}
}
Output
true false
Example 3: Here, we are using contains() method to verify if the ArrayList of Strings contains a specific name.
// 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"));
}
}
Output
false true
