ChoiceFormat parse() method in Java with Examples

The java.text.ChoiceFormat is a class containing a parse() as a function. To retrieve the limit value for a specific format in a ChoiceFormat object, utilize the ChoiceFormat class.

Syntax:

Parameters:

- where the parameters that this method takes is

text_name: which is the text that has to have its limit value found in String format.

status_Of_choice: which is the index for the limit value to be determined at which that option item is present.

Return Value: The format that is associated with the ChoiceFormat object is returned by this function as an array of the given type.

Exception: If either the status or the string text is null, this function raises a NullPointerException.

Example 1:

The Java program shows how to parse a string to obtain an equivalent numerical limit by using the ChoiceFormat class. A ChoiceFormat object is initialized with a pattern that maps the integers 0 to 5 to the months of January through June. The application tries to parse the string "JANUARY" and obtain the related numeric limit by using a ParsePosition object. If it is successful, the limit-which is 0 for "JANUARY" will be printed.

Implementation:

FileName: ChoiceFormatParseExample1.java

import java.text.*;
import java.util.*;
import java.io.*;
public class ChoiceFormatParseExample1
{
	public static void main(String[] argv)
	{
	     try 
	     {
		// Initializing and creating the choiceformat
		ChoiceFormat chofor = new ChoiceFormat( "0#JANUARY | 1#FEBRUARY | 2#MARCH | 3#APRIL | 4#MAY | 5#JUNE");
		// Initializing and creating the parseposition
		ParsePosition parse = new ParsePosition(0);
		// using the parse() function to obtain 
		// the limit of a specific format of the 
		// ChoiceFormat Object
		Number limit = chofor.parse("JANUARY", parse);
		System.out.print("The limit of the choice element is : " + limit.intValue());
	        }
	        catch (NullPointerException ex) 
	        {
		System.out.println("\n The String is Null");
		System.out.println("The Exception thrown is : " + ex);
	        }
	}
}

Output:

The limit of the choice element is : 0

Example 2:

The Java program that is provided shows how to handle a NullPointerException when parsing a null string using the ChoiceFormat class. A ChoiceFormat object is initialized by the program with a pattern that maps integers 0 to 5 to the months of January through June. After that, it makes an effort to use a ParsePosition object to parse a null string. The catch block handles the NullPointerException that is thrown when the input string is null. The program shows the details of an issue and releases a message stating that the string is null.

Implementation:

FileName: ChoiceFormatParseExample2.java

import java.text.*;
import java.util.*;
import java.io.*;
public class ChoiceFormatParseExample2 
{
    public static void main(String[] argv)
    {
	try 
	{
            	// Initializing and creating the choiceformat
		ChoiceFormat chofor = new ChoiceFormat( "0#JANUARY | 1#FEBRUARY | 2#MARCH | 3#APRIL | 4#MAY | 5#JUNE");
		// Initializing and creating the parseposition
		ParsePosition parse = new ParsePosition(0);
		// using the parse() function to obtain 
		// the limit of a specific format of the 
		// ChoiceFormat Object
		Number limit = chofor.parse(null, parse);
		System.out.print("The limit of the choice element is : " + limit.intValue());
	}
	catch (NullPointerException ex) 
	{
		System.out.println("\n The String is Null");
		System.out.println("The Exception thrown is : " + ex);
	}
     }
}

Output:

The String is Null
The Exception thrown is : java.lang.NullPointerException: Cannot invoke "String.regionMatches(int, String, int, int)" because "text" is null

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