Write the method stringSplosion(). * * The method takes one parameter, non-empty String str (such as "Code") and * returns a String in the form "CCoCodCode". Notice that this includes the * first character of the original String, followed by the first two characters, * and so on until the whole String is used. * * Examples: stringSplosion("Code") returns "CCoCodCode" stringSplosion("abc") * returns "aababc" stringSplosion("x") returns "x" * * @param str the input String to process. *, @return a new String as described above. Use for loops

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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.