Create a code that tracks how many times a phrase appears in a string. A number should be the function's output value. Never presume that a series of words can contain punctuation and only one space between words. Create the method so that it accepts a String argument or a StringBuilder object as a parameter.

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Q: Why does the StringWriter class use a StringBuffer to perform its work?

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Methods of StringBuilder class

The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.