Java Math.nextUp() Method

The java.lang.Math.nextUp() is a inbuilt math method in java. It returns the floating-point value adjacent to the user specified parameter (d) in the direction of positive infinity. This method is equivalent to nextAfter(d, Double.POSITIVE_INFINITY) method.
Implementation of nextUp may run faster than its equivalent nextAfter call.

Syntax:

public static double nextUp(double a)
public static float nextUp(float a)

Parameter

Return:

This method returns the adjacent floating-point value closer to positive infinity.

If the argument is a NaN, this method will return NaN.
If the argument is Zero and we are dealing with double, this method will return Double.MIN_VALUE.
If the argument is zero and we are dealing with float, this method will return Float.MIN_VALUE.
If the argument is Positive Infinity, this method will return Positive Infinity.

Example 1

public class NextUpExample1
{
    public static void main(String[] args) 
    {
         float x = 0.0f / 0;
        // Input NaN, Output NaN
        System.out.println(Math.nextUp(x));
    }
}

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Output:

NaN

Example 2

public class NextUpExample2
{
    public static void main(String[] args) 
    {
        double x = 744.93;
        // Input double value, Output adjacent floating-point
        System.out.println(Math.nextUp(x));
    }
}

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Output:

744.9300000000001

Example 3

public class NextUpExample3 
{
    public static void main(String[] args) 
    {
        float a = 328.7f;
        // Input float value, Output adjacent floating-point
        System.out.println(Math.nextUp(a));
    }
}

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Output:

328.70004

Example 4

public class NextUpExample4 
{
    public static void main(String[] args) 
    {
         float x = 0.0f;
        // Input zero, Output Float.MIN_VALUE for float
        System.out.println(Math.nextUp(x));
    }
}

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Output:

1.4E-45

Example 5

public class NextUpExample5
{
    public static void main(String[] args) 
    {
        double b = 0.0;
        // Input zero, Output Double.MIN_VALUE for double
        System.out.println(Math.nextUp(b));
    }
}

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Output: