Java .floor()

The Math.floor() method returns the largest integer value that is less than or equal to the argument.

Syntax

Math.floor(x);

The num parameter can either be a floating-point value or a variable that points to a floating-point value. The return value is the same as num under the following conditions:

• num is already an integer.
• num is NaN, infinity, or zero (positive or negative).

Example 1

In the case of double values, Math.floor() returns the next integer value below the provided double value. In the case of integers provided, these will return the same value as provided:

// Example.java
public class Example {
  public static void main(String args[]) {
    System.out.println(Math.floor(-3.9));
    System.out.println(Math.floor(1.0001));
    System.out.println(Math.floor(0));
  }
}

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This will produce the following output:

-4.0
1.0
0.0

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Example 2

The following example features unsuccessful calls to the Math.floor() method:

// Example.java
public class Example {
  public static void main(String args[]) {
    System.out.println(Math.floor(2.0 % 0));
    System.out.println(Math.floor(Double.POSITIVE_INFINITY));
  }
}

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This will produce the following output:

NaN
Infinity

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