MessageFormat getFormatsByArgumentIndex() method in Java with Example

The getFormatsByArgumentIndex() method of java.text.MessageFormat class is used to get the format for every argument index chronologically which is present in the pattern of message format object . if there is no format present for that particular argument index it will just return null.
Syntax:

public Format[] getFormatsByArgumentIndex()

Parameter: This method does not take any argument as a parameter.
Return Value: This method returns format for every argument index which is present in the pattern of message format object chronologically.
Below are the examples to illustrate the getFormatsByArgumentIndex() method:
Example 1:

Java

// Java program to demonstrate
// getFormatsByArgumentIndex() 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, number, integer}, {2, number, float}, {5, date}");

        // display the result
        System.out.println("pattern : "
                           + mf.toPattern());

        // getting all the format
        // used in MessageFormat Object
        // using getFormatsByArgumentIndex() method
        Format[] formats = mf.getFormatsByArgumentIndex();

        // display the result
        System.out.println("\nRequired Formats are : ");
        for (int i = 0; i < formats.length; i++)
            System.out.println(formats[i]);
    }
}

Output:

pattern : {1, number, integer}, {2, number, float#}, {5, date}

Required Formats are : 
null
java.text.DecimalFormat@674dc
java.text.DecimalFormat@5d69738
null
null
java.text.SimpleDateFormat@ce9bf0a5

Example 2:

Java

// Java program to demonstrate
// getFormatsByArgumentIndex() 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("{0, number, #}, {2, date, #.#}, {4, time}");

        // display the result
        System.out.println("pattern : "
                           + mf.toPattern());

        // getting all the format
        // used in MessageFormat Object
        // using getFormatsByArgumentIndex() method
        Format[] formats = mf.getFormatsByArgumentIndex();

        // display the result
        System.out.println("\nRequired Formats are : ");
        for (int i = 0; i < formats.length; i++)
            System.out.println(formats[i]);
    }
}

Output:

pattern : {0, number, #}, {2, date, #.#}, {4, time}

Required Formats are : 
java.text.DecimalFormat@674dc
null
java.text.SimpleDateFormat@8918
null
java.text.SimpleDateFormat@8400729

Reference: https://docs.oracle.com/javase/9/docs/api/java/text/MessageFormat.html#getFormatsByArgumentIndex–