The Java `Math`

class contains all the familiar mathematical functions found on an electronic calculators, such as sine, log, and square root and more. For the most part, the functions use datatype `double`

as a parameter and returns a `double`

value. Let's take a look at a few of the methods and fields in the `Math`

class.

```
package exlcode;
public class MathClassExample {
public static double exampleVariableOne = Math.PI;
// Methods will be explained later this unit
public static double exampleVariableTwo = Math.pow(10, 2);
public static double exampleVariableThree = Math.sqrt(exampleVariableTwo);
public static void main(String[] args) {
System.out.println(exampleVariableOne);
System.out.println(exampleVariableTwo);
System.out.println(exampleVariableThree);
}
}
```

We will go into further detail about the methods of the `Math`

class later on, so let's explore `Math.PI`

, one of the two fields of the `Math`

class. This field represents the value of pi. A dot is used after typing "Math" to access the field and the method inside the `Math`

class. You have to check the input and output type of the methods inside the `Math`

class to use them correctly without throwing errors. To avoid syntax errors, the method and field names have to match the names written in the Java documentation for the `Math`

class. You do not have to import the `Math`

class as it is already part of the `java.lang`

package.