Java Math - nextAfter() Method

The java.lang.Math.nextAfter() method returns the floating-point number adjacent to the first argument in the direction of the second argument. If both arguments compare as equal a value equivalent to the second argument is returned. In special cases it returns the following:

• If either argument is a NaN, then NaN is returned.
• If both arguments are signed zeros, a value equivalent to direction is returned.
• If start is infinite and direction has a value such that the result should have a smaller magnitude, Double.MAX_VALUE with the same sign as start is returned.
• If start is ±Double.MIN_VALUE and direction has a value such that the result should have a smaller magnitude, then a zero with the same sign as start is returned.
• If start is equal to ±Double.MAX_VALUE and direction has a value such that the result should have a larger magnitude, an infinity with same sign as start is returned.

Syntax

public static double nextAfter(double start,
                               double direction)

Parameters

Return Value

Returns the floating-point number adjacent to the first argument in the direction of the second argument.

Exception

NA.

Example:

In the example below, nextAfter() method returns the floating-point number adjacent to the first argument in the direction of the second argument.

import java.lang.*;

public class MyClass {
 public static void main(String[] args) {
  System.out.println(Math.nextAfter(2.55, 4)); 
  System.out.println(Math.nextAfter(10.1, 3));   
 }
}

The output of the above code will be:

2.5500000000000003
10.099999999999998