Java Math API

Return the absolute value of an int. Long.MIN_VALUE remains negative.

Math.abs(-5)   // 5
Math.abs(5)    // 5
Math.abs(-2147483648)  // -2147483648 (overflow!)

Return the greater of two int values.

Math.max(3, 7)   // 7
Math.max(-1, -5)  // -1

Return the smaller of two int values.

Math.min(3, 7)   // 3
Math.min(-1, -5)  // -5

Return the value of a raised to the power of b.

Math.pow(2, 10)   // 1024.0
Math.pow(9, 0.5)   // 3.0
Math.pow(2, -1)    // 0.5

Return the correctly rounded positive square root of a. NaN if a < 0.

Math.sqrt(9)    // 3.0
Math.sqrt(2)    // 1.4142135623730951
Math.sqrt(-1)   // NaN

Return the closest long to a, with ties rounding to positive infinity.

Math.round(2.4)   // 2
Math.round(2.5)   // 3
Math.round(-2.5)  // -2

Return the smallest (closest to negative infinity) double that is greater than or equal to a and equal to a mathematical integer.

Math.ceil(2.1)   // 3.0
Math.ceil(-2.9)  // -2.0

Return the largest (closest to positive infinity) double that is less than or equal to a and equal to a mathematical integer.

Math.floor(2.9)   // 2.0
Math.floor(-2.1)  // -3.0

Return a double value with a positive sign, greater than or equal to 0.0 and less than 1.0.

Math.random()                    // e.g. 0.5819...
(int)(Math.random() * 6) + 1     // 1..6 (dice)
Math.random() * 100              // 0..99.99...