To check if a string s contains the prefix "Java", you may write A. if (s. startsWith ("Java")) ... B. if (s. indexOf ("Java") = = 0) ... C. if (s. substring (0, 4). equals ("Java")) ... D. if (s. charAt (0) = = 'J' && s. charAt (1) = = 'a' && s. charAt (2) = = 'v' && s. charAt (3) = = 'a') ...

D

Explanation:

Option D is the correct answer The Option checks each characters from index 0-3 and compares the character against the letters (J, A, V, A). See an implementation of in the code snippet below. The output will be Yes since the condition is true

public class num5 {

public static void main (String[] args) {

//Create a string and give a value starting with Java

String s = "Java is cool";

if (s. charAt (0) = = 'J' && s. charAt (1) = = 'a' && s. charAt (2)

= = 'v' && s. charAt (3) = = 'a') {

System. out. println ("Yes");

}

else{

System. out. println ("No");

}

}

}