In Java how to append a string more efficiently

Question

I wrote a Java program  in which  I need to append a string     u13a2  to an existing one  u1234 u12de u1386     u15a3    So gradually the string becomes longer and longer  I found the time spent on each appending also becomes longer and longer  Is there any way that we can improve this to some extend    The implementation came to my mind includes   unicodeArray        unicode    or  unicodeArray   unicodeArray concat     unicode     They gave similar performance  I think the main reason that causes these bad performance is the special type String  It creates a new object for every assignment  If you also think so  does this mean I d better use another type  like byte array

User · Accepted Answer

Use StringBuilder class  It is more efficient at what you are trying to do

User · Answer

java lang StringBuilder  Use int constructor to create an initial size

User · Answer

- Each time you append or do any modification with it  it creates a new String object   - So use append   method of StringBuilder If thread safety is not important   else use StringBuffer If thread safety is important    that will be efficient way to do it

User · Answer

You should use the StringBuilder class   StringBuilder stringBuilder   new StringBuilder     stringBuilder append  Some text    stringBuilder append  Some text    stringBuilder append  Some text     String finalString   stringBuilder toString      In addition  please visit     How Java optimize the code with StringBuilder     StringBuilder vs String concatenation in toString   in Java

User · Answer

You can use StringBuffer or StringBuilder for this  Both are for dynamic string manipulation  StringBuffer is thread-safe where as StringBuilder is not   Use StringBuffer in a multi-thread environment  But if it is single threaded StringBuilder is recommended and it is much faster than StringBuffer

[java] In Java, how to append a string more efficiently?

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