String Methods
String methods are used to process string variables and string arrays.
Concatenates the given string matrix (which can be given as a varargs of rows) into a single string. Puts colSepar between values of columns of a row, and rowSepar between rows.
Returns true if the given string array strs contains the given string str.
Returns the index to the first occurrence of str in strs or -1 if no match.
Returns the first index of str that is the start of the substring toFind. If there is no substring matching toFind in str, -1 is returned.
Returns a string where orig has been replaced by replacement.