NumberFormat parse() method in Java with Examples

1. The parse(str) method is a built-in method of the java.text.NumberFormat which parses text from the beginning of the given string to produce a number. The method may not use the entire text of the given string

   Syntax:

   public Number parse?(String str)

   Parameters: The function accepts a string str whose beginning should be parsed.

   Return Value: The function returns a number parsed from the string.

   Exceptions: The function throws a ParseException if the beginning of the specified string cannot be parsed.

   Below is the implementation of the above function:

   Program 1:

   // Java program to implement
   // the above function
   
   import java.text.NumberFormat;
   import java.util.Locale;
   import java.text.ParsePosition;
   
   public class Main {
       public static void main(String[] args)
           throws Exception
       {
   
           // Get the number instance
           NumberFormat nF
               = NumberFormat.getNumberInstance();
   
           // Prints the parsed number or NULL
           System.out.println("Number parsed: "
                              + nF.parse("567"));
       }
   }
   Output:

   Number parsed: 567
   

2. The parse(str, parseIndex) method is a built-in method of the java.text.NumberFormat which parses a number from the text and returns a Long if possible, otherwise a Double. If IntegerOnly is set, will stop at a decimal point (or equivalent; e.g., for rational numbers “1 2/3”, will stop after the 1).

   Syntax:

   public abstract Number parse(String str, ParsePosition parseIndex)

   Parameters: The function accepts two parameters which are described below:

   • str: specifies the string to be parsed.

   parseIndex: specifies the parse position

   Return Value: The function returns a number parsed from the string.

   Below is the implementation of the above function:

   Program 1:

   // Java program to implement
   // the above function
   
   import java.text.NumberFormat;
   import java.util.Locale;
   import java.text.ParsePosition;
   
   public class Main {
       public static void main(String[] args)
           throws Exception
       {
   
           // Get the number instance
           NumberFormat nF
               = NumberFormat.getNumberInstance();
   
           // Prints the parsed number or NULL
           System.out.println("Number parsed: "
                              + nF.parse("567",
                                         new ParsePosition(1)));
       }
   }
   Output:

   Number parsed: 67
   

Reference: https://docs.oracle.com/javase/10/docs/api/java/text/NumberFormat.html#parse(java.lang.String)