JavaMath

The Java Math class has many methods that allows you to perform mathematical tasks on numbers.

Math.max(x,y)

TheMath.max(x,y) method can be used to find the highest value ofx andy:

Math.max(5, 10);

Math.min(x,y)

TheMath.min(x,y) method can be used to find the lowest value ofx andy:

Math.min(5, 10);

Math.sqrt(x)

TheMath.sqrt(x) method returns the square root ofx:

Math.sqrt(64);

Math.abs(x)

TheMath.abs(x) method returns the absolute (positive) value ofx:

Math.abs(-4.7);

Math.pow(x, y)

TheMath.pow(x, y) method returns the value ofx raised to the power ofy:

Math.pow(2, 8);  // 256.0

Rounding Methods

Java has several methods for rounding numbers:

• Math.round(x) - rounds to the nearest integer
• Math.ceil(x) - rounds up (returns the smallest integer greater than or equal to x)
• Math.floor(x) - rounds down (returns the largest integer less than or equal to x)

Math.round(4.6);  // 5Math.ceil(4.1);   // 5.0Math.floor(4.9);  // 4.0

Random Numbers

Math.random() returns a random number between 0.0 (inclusive), and 1.0 (exclusive):

Math.random();

To get more control over the random number, for example, if you only want a random number between 0 and 100, you can use the following formula:

int randomNum = (int)(Math.random() * 101);  // 0 to 100