What is the value of knock? (be exact, don't add any spaces by accident)   String knocker = "tattarrattat"; String knock = knocker.substring(knocker.indexOf("r")+1,                 knocker.indexOf("t", knocker.length()-1)+1);

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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.