This method will return a string that when printed out will display a triangle. Each row of the triangle will have the next letter from the input argument as the last letter in the row. If the next letter is the noPrint char, * will print out instead of letters for the row. Can’t use System.out.println.

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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.