If you also want to remove lines that only contain whitespace, use resultString = Regex.Replace(subjectString, @”^\s+$[\r\n]*”, string.Empty, RegexOptions.Multiline); ^\s+$ will remove everything from the first blank line to the last (in a contiguous block of empty lines), including lines that only contain tabs or spaces. [\r\n]* will then remove the last CRLF (or just LF … Read more
StringJoiner is very useful, when you need to join Strings in a Stream. As an example, if you have to following List of Strings: final List<String> strings = Arrays.asList(“Foo”, “Bar”, “Baz”); It is much more simpler to use final String collectJoin = strings.stream().collect(Collectors.joining(“, “)); as it would be with a StringBuilder: final String collectBuilder = … Read more
There is memory but no contiguous segment that can handle the size of your string builder. You have to know that each time the buffer of the string builder is too short, its size is doubled. If you can define (in the ctor) the size of your builder, it’s better. You MAY call GC.Collect() when … Read more
Absolutely not; here’s a simple example lifted from 4.0 via reflector: [SecuritySafeCritical] public StringBuilder Append(char value) { if (this.m_ChunkLength < this.m_ChunkChars.Length) { this.m_ChunkChars[this.m_ChunkLength++] = value; } else { this.Append(value, 1); } return this; } The attribute just handles callers, not thread-safety; this is absolutely not thread-safe. Update: looking at the source he references, this is … Read more
Ok I will suppose a general use, first you have to download apache commons, there you will find an utility class named IOUtils which has a method named copy(); Now the solution is: get the input stream of your CLOB object using getAsciiStream() and pass it to the copy() method. InputStream in = clobObject.getAsciiStream(); StringWriter … Read more
If you have to write code for Internet Explorer make sure you chose an implementation, which uses array joins. Concatenating strings with the + or += operator are extremely slow on IE. This is especially true for IE6. On modern browsers += is usually just as fast as array joins. When I have to do … Read more
You can use the String javax.xml.bind.DatatypeConverter.printHexBinary(byte[]). e.g.: public static void main(String[] args) { byte[] array = new byte[] { 127, 15, 0 }; String hex = DatatypeConverter.printHexBinary(array); System.out.println(hex); // prints “7F0F00” }
When you use the + operator to build up a string: string s = “01”; s += “02”; s += “03”; s += “04”; then on the first concatenation we make a new string of length four and copy “01” and “02” into it — four characters are copied. On the second concatenation we make … Read more
The aim of using StringBuilder, i.e reducing memory. Is it achieved? No, not at all. That code is not using StringBuilder correctly. (I think you’ve misquoted it, though; surely there aren’t quotes around id2 and table?) Note that the aim (usually) is to reduce memory churn rather than total memory used, to make life a … Read more
Others have pointed out the deleteCharAt method, but here’s another alternative approach: String prefix = “”; for (String serverId : serverIds) { sb.append(prefix); prefix = “,”; sb.append(serverId); } Alternatively, use the Joiner class from Guava 🙂 As of Java 8, StringJoiner is part of the standard JRE.