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
