MessageFormat setFormatByArgumentIndex() method in Java with Example
Last Updated :
25 Aug, 2021
The setFormatByArgumentIndex() method of java.text.MessageFormat class is used to set the new format element at the particular index in pattern of message format object by overriding the previous pattern.
Syntax:
public void setFormatByArgumentIndex(int argumentIndex,
Format newFormat)
Parameters: This method takes the following argument as a parameter.
- argumentIndex :- this is the particular index where new format element is going to be placed.
- newFormat :- this is the new Format element which is going to be placed.
Return Value: This method has nothing to return.
Below are the examples to illustrate the setFormatByArgumentIndex() method:
Example 1:
Java
// Java program to demonstrate
// setFormatByArgumentIndex() method
import java.text.*;
import java.util.*;
import java.io.*;
public class GFG {
public static void main(String[] argv)
{
// creating and initializing MessageFormat
MessageFormat mf
= new MessageFormat("{1, date, #}, {3, number, #.##}, {5, time}");
// display the current pattern
System.out.println("old pattern : "
+ mf.toPattern());
// getting all the format element
// used in MessageFormat Object
Format[] formats = mf.getFormatsByArgumentIndex();
// setting the new format element
// at particular index
// using setFormatByArgumentIndex() method
for (int i = 0; i < formats.length; i++)
mf.setFormatByArgumentIndex(i, formats[1]);
// display the result
System.out.println("\nnew pattern : "
+ mf.toPattern());
}
}
Output: old pattern : {1,date, #}, {3,number, #0.##}, {5,time}
new pattern : {1,date, #}, {3,date, #}, {5,date, #}
Example 2:
Java
// Java program to demonstrate
// setFormatByArgumentIndex() method
import java.text.*;
import java.util.*;
import java.io.*;
public class GFG {
public static void main(String[] argv)
{
// creating and initializing MessageFormat
MessageFormat mf
= new MessageFormat("{1, date, #}, {3, number, #.##}, {5, time}");
// display the current pattern
System.out.println("old pattern : "
+ mf.toPattern());
// creating and initializing new Format element
Format fm = NumberFormat.getInstance();
// setting the new format element
// at particular index
// using setFormatByArgumentIndex() method
for (int i = 0; i < 6; i++)
mf.setFormatByArgumentIndex(i, fm);
// display the result
System.out.println("\nnew pattern : "
+ mf.toPattern());
}
}
Output: old pattern : {1,date, #}, {3,number, #0.##}, {5,time}
new pattern : {1,number}, {3,number}, {5,number}
Reference: https://docs.oracle.com/javase/9/docs/api/java/text/MessageFormat.html#setFormatByArgumentIndex-int-java.text.Format-