NumberFormat setRoundingMode() method in Java with Examples

Last Updated : 01 Dec, 2020

The setRoundingMode() method is a built-in method of the java.text.NumberFormat which sets the RoundingMode used in this NumberFormat. The subclasses which handle different rounding modes should override this method.

Syntax:

public void setRoundingMode(RoundingMode mode)

Parameters: The function accepts a mandatory parameter mode which specifies the mode to be set.

Return Value: The function returns nothing, hence has a return type void.

Exceptions: The function throws two exceptions which are described as below:

UnsupportedOperationException: if the default implementation always throws this exception
NullPointerException: if roundingMode is null

Below is the implementation of the above function:

Program 1:

Java

// Java program to implement
// the above function

import java.text.NumberFormat;
import java.util.Locale;
import java.util.Currency;
import java.math.RoundingMode;

public class Main {
    public static void main(String[] args)
        throws Exception
    {

        NumberFormat nF
            = NumberFormat.getNumberInstance();

        System.out.println("set initially as: "
                           + nF.getRoundingMode());

        // Set grouping
        nF.setRoundingMode(RoundingMode.FLOOR);

        // Print the final
        System.out.println("set finally as: "
                           + nF.getRoundingMode());
    }
}

Output:

set initially as: HALF_EVEN
set finally as: FLOOR

Program 2:

Java

// Java program to implement
// the above function

import java.text.NumberFormat;
import java.util.Locale;
import java.util.Currency;
import java.math.RoundingMode;

public class Main {
    public static void main(String[] args)
        throws Exception
    {

        NumberFormat nF
            = NumberFormat.getNumberInstance();

        System.out.println("set initially as: "
                           + nF.getRoundingMode());

        // Set grouping
        nF.setRoundingMode(RoundingMode.DOWN);

        // Print the final
        System.out.println("set finally as: "
                           + nF.getRoundingMode());
    }
}

Output:

set initially as: HALF_EVEN
set finally as: DOWN

Program 3:

Java

// Java program to implement
// the above function

import java.text.NumberFormat;
import java.util.Locale;
import java.util.Currency;
import java.math.RoundingMode;

public class Main {
    public static void main(String[] args)
        throws Exception
    {
        try {

            NumberFormat nF
                = NumberFormat.getNumberInstance();

            System.out.println("set initially as: "
                               + nF.getRoundingMode());

            // Set grouping
            nF.setRoundingMode(null);

            // Print the final
            System.out.println("set finally as: "
                               + nF.getRoundingMode());
        }
        catch (Exception e) {
            System.out.println("Exception is: "
                               + e);
        }
    }
}

Output:

set initially as: HALF_EVEN
Exception is: java.lang.NullPointerException

Reference: https://docs.oracle.com/javase/10/docs/api/java/math/RoundingMode.html

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NumberFormat setRoundingMode() method in Java with Examples

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