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Java Math Methods

• Java Math.abs()
• Java Math.acos()
• Java Math.addExact()
• Java Math.asin()
• Java Math.atan()
• Java Math.cos()
• Java Math.sin()
• Java Math.tan()
• Java Math.sinh()
• Java Math.cosh()
• Java Math.tanh()
• Java Math.sqrt()
• Java Math.cbrt()
• Java Math.pow()
• Java Math.subtractExact()
• Java Math.multiplyExact()
• Java Math.incrementExact()
• Java Math.decrementExact()
• Java Math.negateExact()
• Java Math.toIntExact()
• Java Math.min()
• Java Math.max()
• Java Math.ceil()
• Java Math.floor()
• Java Math.round()
• Java Math.toRadians()
• Java Math.toDegrees()
• Java Math.atan2()
• Java Math.copySign()
• Java Math.exp()
• Java Math.expm1()
• Java Math.getExponent()
• Java Math.hypot()
• Java Math.IEEEremainder()
• Java Math.log()
• Java Math.log10()
• Java Math.log1p()
• Java Math.nextAfter()
• Java Math.nextUp()
• Java Math.nextDown()
• Java Math.rint()
• Java Math.random()

Java Tutorials

• Java Math floor()
• Java Math ceil()
• Java Math rint()
• Java Math.random()
• Java Math abs()
• Java Math max()

Java Math round()

The round() method rounds the specified value to the closest int or long value and returns it. That is, 3.87 is rounded to 4 and 3.24 is rounded to 3.

Example

class Main { public static void main(String[] args) { double a = 3.87; System.out.println(Math.round(a)); } } // Output: 4

Syntax of Math.round()

The syntax of the round() method is:

Math.round(value)

Here, round() is a static method. Hence, we are accessing the method using the class name, Math.

round() Parameters

The round() method takes a single parameter.

• value - number which is to be rounded

Note: The data type of the value should be either float or double.

round() Return Value

• returns the int value if the argument is float
• returns the long value if the argument is double

The round() method:

• rounds upward if the value after the decimal is greater than or equal to 5 1.5 => 2 1.7 => 2
• rounds downward if the value after the decimal is smaller than 5 1.3 => 1

Example 1: Java Math.round() with double

class Main { public static void main(String[] args) { // Math.round() method // value greater than 5 after decimal double a = 1.878; System.out.println(Math.round(a)); // 2 // value equals to 5 after decimal double b = 1.5; System.out.println(Math.round(b)); // 2 // value less than 5 after decimal double c = 1.34; System.out.println(Math.round(c)); // 1 } }

Example 2: Java Math.round() with float

class Main { public static void main(String[] args) { // Math.round() method // value greater than 5 after decimal float a = 3.78f; System.out.println(Math.round(a)); // 4 // value equals to 5 after decimal float b = 3.5f; System.out.println(Math.round(b)); // 4 // value less than 5 after decimal float c = 3.44f; System.out.println(Math.round(c)); // 3 } }

Also Read:

• Java Math.floor()
• Java Math.ceil()

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