Java Math
The Java Math class has many methods that allows you to perform mathematical tasks on numbers.
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Math.max(x,y)
The Math.max(x,y) method can be used to find the highest value of x and
y:
Math.min(x,y)
The Math.min(x,y) method can be used to find the lowest value of x
and y:
Math.sqrt(x)
The Math.sqrt(x) method returns the square root of x:
Math.abs(x)
The Math.abs(x) method returns the absolute (positive) value of x:
Math.pow(x, y)
The Math.pow(x, y) method returns the value of x raised to the power of y:
Note: Math.pow(2, 8) means
2 multiplied by itself 8 times:
2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 = 256
Note: The Math.pow() method always returns a
double, even if the result is a whole number.
For example, Math.pow(2, 8) returns 256.0 (not 256).
Rounding Methods
Java has several methods for rounding numbers:
Math.round(x) - rounds to the nearest integerMath.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)
Example
Math.round(4.6); // 5
Math.ceil(4.1); // 5.0
Math.floor(4.9); // 4.0
Try it Yourself »
Random Numbers
Math.random() returns a random number between 0.0 (inclusive), and 1.0 (exclusive):
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:
Note: Math.random() returns a
double. To get an integer, you need to cast it with
(int).
