The setFormatsByArgumentIndex method of java.text.MessageFormat class is used to set the array of new format element in the pattern of message format object by overriding the old pattern.
Syntax:
public void setFormatsByArgumentIndex(Format[] newFormats)
Parameter: This method takes an array of format element as a parameter for overriding the old pattern of message format object.
Return Value: This method has nothing to return.
Exception: This method throws NullPointerException if array of new format element is null.
Below are the examples to illustrate the setFormatsByArgumentIndex() method:
Example 1:
// Java program to demonstrate// setFormatsByArgumentIndex() method  import java.text.*;import java.util.*;import java.io.*;  public class GFG {    public static void main(String[] argv)    {        try {            // creating and initializing MessageFormat            MessageFormat mf                = new MessageFormat("{0, date, #}, {2, number, #.##}, {4, time}");              // display the current message format object            displayFormat(mf);              // creating and initializing new Format object array            Format[] format = { new SimpleDateFormat("YYYY-'W'ww-u"),                                new DecimalFormat("10.5678") };              // settting the new array of formats            // in the pattern of MessageFormat object            // using setFormatsByArgumentIndex() method            mf.setFormatsByArgumentIndex(format);              // display the Override MessageFormat object            System.out.println();            displayFormat(mf);        }        catch (NullPointerException e) {            System.out.println("format array is null");            System.out.println("Exception thrown : " + e);        }    }      // Defining displayFormat method    public static void displayFormat(MessageFormat mf)    {          // display the result        System.out.println("pattern : "                           + mf.toPattern());          // getting all format        // used in MessageFormat Object        // using getFormats() method        Format[] formats = mf.getFormats();          // display the result        System.out.println("Required Formats are : ");        for (int i = 0; i < formats.length; i++)            System.out.println(formats[i]);    }} |
Output:
pattern : {0, date, #}, {2, number, #0.##}, {4, time}
Required Formats are :
java.text.SimpleDateFormat@403
java.text.DecimalFormat@674fc
java.text.SimpleDateFormat@8400729
pattern : {0, date, YYYY-'W'ww-u}, {2, number, #0.##}, {4, time}
Required Formats are :
java.text.SimpleDateFormat@d21287d2
java.text.DecimalFormat@674fc
java.text.SimpleDateFormat@8400729
Example 2:
// Java program to demonstrate// setFormatsByArgumentIndex() method  import java.text.*;import java.util.*;import java.io.*;  public class GFG {    public static void main(String[] argv)    {        try {            // creating and initializing MessageFormat            MessageFormat mf                = new MessageFormat("{0, date, #}, {2, number, #.##}, {4, time}");              // display the current message format object            displayFormat(mf);              // creating and initializing new Format object array            Format[] format = { new SimpleDateFormat("YYYY-'W'ww-u"),                                new DecimalFormat("10.5678") };              // settting the new array of formats            // in the pattern of MessageFormat object            // using setFormatsByArgumentIndex() method            mf.setFormatsByArgumentIndex(null);              // display the Override MessageFormat object            System.out.println();            displayFormat(mf);        }        catch (NullPointerException e) {            System.out.println("\nformat array is null");            System.out.println("Exception thrown : " + e);        }    }      // Defining displayFormat method    public static void displayFormat(MessageFormat mf)    {          // display the result        System.out.println("pattern : "                           + mf.toPattern());          // getting all format        // used in MessageFormat Object        // using getFormats() method        Format[] formats = mf.getFormats();          // display the result        System.out.println("Required Formats are : ");        for (int i = 0; i < formats.length; i++)            System.out.println(formats[i]);    }} |
Output:
pattern : {0, date, #}, {2, number, #0.##}, {4, time}
Required Formats are :
java.text.SimpleDateFormat@403
java.text.DecimalFormat@674fc
java.text.SimpleDateFormat@8400729
format array is null
Exception thrown : java.lang.NullPointerException
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