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copied!<p>The following Java class implements the most important features of the String.Format method in C#. It supports the 'X' and 'D' format specifiers, but not 'F', 'G', or 'R'.</p> <pre><code>package com.upokecenter.util; import java.util.Locale; public final class DotNetFormatter { private DotNetFormatter() { } public static String format(String formattedText, Object... options) { return format(Locale.getDefault(),formattedText,options); } public static String format(Locale locale, String formattedText, Object... options) { int numOptions = options.length; StringBuilder buffer = new StringBuilder(); int i; for (i = 0; i < formattedText.length(); i++) { char c = formattedText.charAt(i); if (c == '{') { i++; if (i < formattedText.length()) { c = formattedText.charAt(i); if (c == '{') { buffer.append('{'); } else if (c >= '0' || c <= '9') { int x = (c - '0'); i++; while (i < formattedText.length()) { c = formattedText.charAt(i); if (c == ':') { i++; if (x >= numOptions || i >= formattedText.length()) throw new IllegalArgumentException( "Format string contains a badly numbered argument."); char formatType = formattedText.charAt(i); if (formatType == 'x' || formatType == 'X' || formatType == 'd' || formatType == 'D') { i++; if (i >= formattedText.length()) throw new IllegalArgumentException( "Format string contains a badly numbered argument."); char formatCount = formattedText.charAt(i); if (formatCount == '}') { switch (formatType) { case 'x': buffer.append(String.format(locale, "%x", options[x])); break; case 'X': buffer.append(String.format(locale, "%X", options[x])); break; case 'd': buffer.append(String.format(locale, "%d", options[x])); break; case 'D': buffer.append(String.format(locale, "%d", options[x])); break; } break; } else if (formatCount < '0' || formatCount > '9' || (++i) >= formattedText.length()) throw new IllegalArgumentException( "Format string contains a badly numbered argument."); else { if (formattedText.charAt(i) != '}') throw new IllegalArgumentException( "Format string contains a badly numbered argument."); String fmt = ""; switch (formatType) { case 'x': fmt = String.format("%%0%cx", formatCount); break; case 'X': fmt = String.format("%%0%cX", formatCount); break; case 'd': fmt = String.format("%%0%cd", formatCount); break; case 'D': fmt = String.format("%%0%cd", formatCount); break; } buffer.append(String.format(locale, fmt, options[x])); break; } } else { throw new IllegalArgumentException( "Format string contains a badly formatted argument."); } } else if (c == '}') { if (x >= numOptions) throw new IllegalArgumentException( "Format string contains a badly numbered argument."); buffer.append(String.format(locale, "%s", options[x])); break; } else if (c >= '0' || c <= '9') { i++; x = x * 10 + (c - '0'); } else { throw new IllegalArgumentException( "Format string contains a badly formatted argument."); } } } else { buffer.append('{'); buffer.append(c); } } else { buffer.append(c); } } else { buffer.append(c); } } return buffer.toString(); } } </code></pre>

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