Java Math.round() method

The java.lang.Math.round() is used round of the decimal numbers to the nearest value. This method is used to return the closest long to the argument, with ties rounding to positive infinity.

Syntax

public static int round(float x)
public static long round(double x)

Parameter

Return

If the argument is positive or negative number, this method will return the nearest value.
If the argument is not a number (NaN), this method will return Zero.
If the argument is positive Infinity or any value less than or equal to the value of Integer.MIN_VALUE, this method will return Integer.MIN_VALUE.
If the argument is negative Infinity or any value less than or equal to the value of Long.MAX_VALUE, this method will return Long.MAX_VALUE.

Example 1

public class RoundExample1
{
    public static void main(String[] args) 
    {
        double x = 79.52;
        // find the closest int for the double
        System.out.println(Math.round(x));
    }
}

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Output:

Example 2

public class RoundExample2
{
    public static void main(String[] args) 
    {
        double x = -83.76;
        // find the closest int for the double
        System.out.println(Math.round(x));  
    }
}

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Output:

-84

Example 3

public class RoundExample3
{
    public static void main(String[] args) 
    {
        double negativeInfinity = Double.NEGATIVE_INFINITY;
        // Input negative Infinity, Output Long.MAX_VALUE 
        System.out.println(Math.round(negativeInfinity));  
    }
}

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Output:

-9223372036854775808

Example 4

public class RoundExample4
{
    public static void main(String[] args) 
    {
        double x = 1.0/0;
        // Input positive Infinity, Output Integer.MAX_VALUE 
        System.out.println(Math.round(x));  
    }
}

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Output:

9223372036854775807

Example 5

public class RoundExample5
{
    public static void main(String[] args) 
    {
        double x = 0.0/0;
        // Input NaN, Output Zero
        System.out.println(Math.round(x));  
    }
}

Test it Now

Output:

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