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MessageFormat setFormatByArgumentIndex() method in Java with Example

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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-



Last Updated : 25 Aug, 2021
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