stringbuilder sample

Today, I suddenly remembered how to test the stringbuilder object efficiency under Js. So I wrote a loop to test it. The result was a bit unexpected. 1. directly use the + = Operator for 50 thousand cycles:1 var sbtest // = new SYS. stringbuilder (); 2 For (VAR I = 0; I 3 { 4 var now = new date (); 5 sbtest + = now. getseconds () + "6} 7 8 $ get ("message"). innerhtml = sbtest; //. tostring ('| The test res

Function Stringbuilder () {This. Buffer=NewArray ();} Stringbuilder. Prototype. append = Function Append (string) { If (String = Null ) | ( Typeof (String) = 'Undefined ')) Return ; If (( Typeof (String) = 'String ') (String. Length = 0 )) Return ; This . Buffer. Push (string );} ;Stringbuilder. Prototype. appe

In many cases, stringbuilder is faster and faster than String concatenation. The fact is that stringbuilder is faster than string because the intermediate object is generated during String concatenation and eventually garbage is generated.For example:String STR = "";STR + = "B ";STR + = "C ";The final result is "ABC", but the second line produces "AB", which is only an intermediate object and garbage. Usin

contain "" startle , and the string buffer z.insert(4, "le") will be changed to contain " starlet ".Typically, if SB refers to StringBuilder an instance, then sb.append(x) it sb.insert(sb.length(),x) has the same effect.When an operation related to a source sequence, such as an append or insert operation in a source sequence, occurs, the class is synchronized only on the string buffer that performs this operation instead of on the source.Each string

The position of the three classes in string processing is self-evident, so what are their pros and cons, and when should it be used? Let's take a look at the following points1. Comparison of the implementation speed of the three: StringBuilder > StringBuffer > StringReasons for 2.String String: Strings constantStringBuffer: Character creation variableStringBuilder: Character creation variableAs you can see from the above name, string is a "a constant"

I just graduated, but also from C #, in the process of learning PHP found that PHP is not similar to C # StringBuilder type. Because I know that in C # multiple manipulation of strings with StringBuilder efficiency is higher than string, then want to ask the next PHP why not implement StringBuilder? Also, if I use an array to simulate

(Transferred from: http://www.cnblogs.com/xudong-bupt/p/3961159.html)In Java, String, StringBuffer, and StringBuilder are frequently used strings in programming, and the differences between them are frequently asked questions in the interview. Now summarize and see how they differ from the same.1. Variable and non-changeable　　The string class uses a character array to hold strings, as follows, because there is a "final" modifier, so you know that the

In many cases, StringBuilder is faster and faster than string concatenation. The fact is that StringBuilder is faster than string because the intermediate object is generated during string concatenation and eventually garbage is generated.For example:String str = "";Str + = "B ";Str + = "c ";The final result is "abc", but the second line produces "AB", which is only an intermediate object and garbage. Usin

String, StringBuffer, StringBuilder, bufferbuilder That is, String. String: unchangeable character sequence. StringBuffer: a variable string of thread-safe characters. StringBuilder: Non-thread security implementation of StringBuffer, JDK1.5 +. Public final class String {private final char value []; public String (String original) {// cut the original String original into a character array and assign i

Excerpt from: http://blog.chinaunix.net/uid-20745012-id-271466.htmlThe StringBuilder does not provide a clear or empty method.There are 3 ways to clear:1) Reborn into one, the old is automatically recovered by the system2) Use Delete3) Use SetLengthCycle three methods 10 million times, code:/** * @ Author WHS * @ creation Date January 30, 2015 * @ Version V 1.0 */package Strdemo;public class Strbuilder {static String a;static long time;p Ublic static

of the specified index position npublic void Setcharat (int n, char ch): Sets the character of the specified index position n to ChStringBuffer replace (int startIndex, int endIndex, string str): Replaces characters from StartIndex to endIndex positions with string strpublic int indexOf (String str): Returns the index of the location where Str is locatedPublic String substring (int start,int end): Intercepts the characters from start to endpublic int Length (): Returns the length of the StringB

I. Overview string Processing in Java we often use Java to provide three classes to provide manipulation of strings, String,stringbuffer,stringbuilder String: fixed length stringbuffer: Non-fixed long thread safety Stringbuilder: Not fixed thread unsafe Second, performance PK

In Java project development, strings are the longest used data type, and string, StringBuilder, and stringbuffer of strings often make it unclear when they should be used.I hereby tidy it up.string literal constantAs you all know, string is an immutable class, and any change to string will cause a new string object to be generated, so each time a change is made to the string type it is equivalent to generating a new string object, and then pointing th

This content is I reprint from everywhere to collate, is my study notes, if involves the copyright question, please give me the message. Or the content of the wrong place, also please great God can help me to point out changes, thank you. One, the difference 1. String is a literal constant, while StringBuffer and StringBuilder are string variables. Character content created by string is immutable, and character content created by StringBuffer and Str

string literal constant StringBuffer string variable (thread safe) StringBuilder string variable (non-thread safe) Briefly, the main performance difference between the string type and the StringBuffer type is that the string is an immutable object, so each time a change is made to the string type it is equivalent to generating a new string object and then pointing the pointer to the new Strin G object, so it is best not to use a string to change the c

JAVA course 31st (Common Object API)-StringBuffer Class amp; StringBuilder class StringBuffer class The principle of string composition is implemented through this class StringBuffer can add or delete string content StringBuffer is a container Many methods are the same as strings. I. Features StringBuffer string buffer, used to store data in containers 1. Variable Length 2. Different data types can be stored 3. convert it to a string for use. 4. Mo