NumberFormat setRoundingMode() method in Java with Examples

The setParseIntegerOnly() 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:

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// 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());
    }
}

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Output:

set initially as: HALF_EVEN
set finally as: FLOOR

Program 2:

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// 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());
    }
}

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Output:

set initially as: HALF_EVEN
set finally as: DOWN

Program 3:

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// 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);
        }
    }
}

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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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