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A function of real numbers is also called a step function if it is piecewise constant function involving a finite number of inputs. There are two types of step functions. Greatest Integer function (floor function) - A function f(x) is said to be a floor function which possesses biggest integer that is less than or equal to the input value x Smallest Integer function (ceiling function) - A function f(x) is said to be a ceiling function which is composed of the lowest integer that is either bigger or equal to the input value x A step function is also known as staircase function, since it looks like a staircase.
Integer.valueOf() is another useful method to convert String to Integer in Java, it offers caching of Integers from -128 to 127. Internally, valueOf() also calls parseInt() method for String to int conversion. In this Java programming tutorial, we will see all three ways to convert String to int value in Java.