When counting specific phrases in a string, what method is primarily used to find each instance?

• A. String.split()
• B. String.indexOf()
• C. String.count()
• D. String.contains()

Answer: (B)

The most suitable method for counting specific phrases in a string is based on how strings are manipulated in programming. In this context, using a method like String.indexOf() is appropriate because it locates the index of the first occurrence of a specified substring within the string. By repeatedly calling this method while adjusting the search position, you can effectively count multiple instances of a phrase by iterating through the string until no further occurrences are found.

This approach allows the developer to track where each instance of the phrase appears, updating the index to continue searching from the next character after the last found instance. Although other methods like String.split() can manipulate strings, and String.contains() can check for the existence of a substring, they do not directly facilitate counting occurrences on their own. String.count() doesn't exist as a standard string method in most programming languages, reinforcing the use of String.indexOf() for this specific task.