JDK Tutorials - Herong's Tutorial Examples - v6.32, by Herong Yang
java.util.DecimalFormat.parse() - Parsing Strings to Number Objects
This section provides a tutorial example on how to use the java.util.DecimalFormat.parse() method to parse or convert numeric strings to number objects.
DecimalFormat objects can also be used to parse strings for numbers by using the parse() method. Here is a demonstration program:
/* NumberParsingTest.java * Copyright (c) HerongYang.com. All Rights Reserved. */ import java.util.*; import java.text.*; class NumberParsingTest { public static void main(String[] a) { parseNumbers(); } public static void parseNumbers() { DecimalFormat nf = new DecimalFormat("#,##0.00"); String ns = "-1234.5678"; Number nv = null; DecimalFormat cf = new DecimalFormat("\u00A4#,##0.00"); String cs = "-$1234.5678"; Number cv = null; DecimalFormat xf = new DecimalFormat("\u00A4#,##0.00;(\u00A4#,##0.00)"); String xs = "($1234.5678)"; Number xv = null; DecimalFormat pf = new DecimalFormat("#,##0.00%"); String ps = "-1234.5678%"; Number pv = null; try { nv = nf.parse(ns); cv = cf.parse(cs); xv = xf.parse(xs); pv = pf.parse(ps); } catch (ParseException e) { System.out.println("Exception: " + e.toString()); } System.out.println("Parsing " + ns + " with " + nf.toPattern()); System.out.println(" " + nv.doubleValue()); System.out.println("Parsing " + cs + " with " + cf.toPattern()); System.out.println(" " + cv.doubleValue()); System.out.println("Parsing " + xs + " with " + xf.toPattern()); System.out.println(" " + xv.doubleValue()); System.out.println("Parsing " + ps + " with " + pf.toPattern()); System.out.println(" " + pv.doubleValue()); } }
Output:
Parsing -51,234.5678 with #,##0.00 -51234.5678 Parsing -$51234.5678 with ñ#,##0.00 -51234.5678 Parsing ($51234.5678) with ñ#,##0.00;(ñ#,##0.00) -51234.5678 Parsing -51234.5678% with #,##0.00% -512.345678
The result is very interesting:
Table of Contents
Date, Time and Calendar Classes
Date and Time Object and String Conversion
►Number Object and Numeric String Conversion
java.util.NumberFormat - Formatting Numeric Values to Strings
►java.util.DecimalFormat.parse() - Parsing Strings to Number Objects
Locales, Localization Methods and Resource Bundles
Calling and Importing Classes Defined in Unnamed Packages
HashSet, Vector, HashMap and Collection Classes
Character Set Encoding Classes and Methods
Encoding Conversion Programs for Encoded Text Files
Datagram Network Communication
DOM (Document Object Model) - API for XML Files
DTD (Document Type Definition) - XML Validation
XSD (XML Schema Definition) - XML Validation
XSL (Extensible Stylesheet Language)
Message Digest Algorithm Implementations in JDK
Private key and Public Key Pair Generation
PKCS#8/X.509 Private/Public Encoding Standards
Digital Signature Algorithm and Sample Program
"keytool" Commands and "keystore" Files
KeyStore and Certificate Classes
Secret Key Generation and Management
Cipher - Encryption and Decryption
The SSL (Secure Socket Layer) Protocol
SSL Socket Communication Testing Programs