Java™ How To Program (Early Objects), Tenth Edition

Math Class Methods

We use various Math class methods here to present the concept of static methods. Class Math provides a collection of methods that enable you to perform common mathematical calculations. For example, you can calculate the square root of 900.0 with the static method call

Math.sqrt(900.0)

This expression evaluates to 30.0. Method sqrt takes an argument of type double and returns a result of type double. To output the value of the preceding method call in the command window, you might write the statement

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System.out.println(Math.sqrt(900.0));

In this statement, the value that sqrt returns becomes the argument to method println. There was no need to create a Math object before calling method sqrt ...