How to check if a string contains the sequences of characters or not using java ?

/ Java program to demonstrate working 
// contains() method 
public class Wikitechy {

    // Driver code 
    public static void main(String args[]) {
        String s1 = "Welcome to Wikitechy";
        if (s1.contains("kite") == true) {
            System.out.println("Yes");
        }
        // prints true 
        else {
            System.out.println("No");
        }
    }
}