The method will return a string that when printed out will display a square or Bad input. If the input argument has a least one noPrint char in it, the string Bad input is returned. Other return a square, where each row reveals just the next letter of input and the remaining letters are *. Not using System.out.println. Must be this output provided in the image.

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Math class and its different methods

Java math class consists of arithmetic math methods that performs basic numeric operations such as finding the maximum or minimum of two values, rounding values, logarithmic functions, square root, and trigonometric functions, etc. The Math library functions can be accessed using the header Java.lang.Math. These math methods under Java math class are for our convenience.