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:

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    // 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"));
        }
    }

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    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:

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    // 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)));
        }
    }

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    Output:

    Number parsed: 67
    

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



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