Java .nextAfter()

The Math.nextAfter() method returns the floating-point number next to the first argument in the direction of the second argument.

Syntax

Math.nextAfter(start, direction)

• The first argument start can be of type double or float.
• The second argument direction can only be of type double.
• The return type for .nextAfter() is of double or float, and matches the type of the first argument.
• If direction > start, then return result is > start.
• If direction < start, then return result is < start.
• If direction == start, then value of direction is returned.

Some special cases for .nextAfter() include:

• If one or both arguments are NaN, the result is NaN.
• If both arguments are signed zero, the direction of the result is unchanged.
• If the first argument is positive or negative MIN_VALUE, and the second argument has a value which would return a result with a smaller magnitude, zero is returned with the same sign as the first argument.
• If the first argument is infinity and the second argument has a value which would return a result with a smaller magnitude, MAX_VALUE is returned with the same sign as the first argument.
• If the first argument is positive or negative MAX_VALUE, and the second argument has a value which would return a result with a larger magnitude, infinity is returned with the same sign as the first argument.

Example

The following example demonstrates using .nextAfter():

// Test.java
public class Test {
  public static void main(String args[]) {
    float start = 1.15f;
    double direction = 5.37;
    System.out.println(Math.nextAfter(start, direction));
  }
}

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This results in the following output of type float:

1.1500001

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