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Thread: what is string and StringBuffer and StringBuilder?

  1. #1
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    Default what is string and StringBuffer and StringBuilder?

    Hello everyone

    Can you explain more about string and StringBuffer and StringBuilder?

    Thank you in advance

  2. #2
    Senior Member PhHein's Avatar
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    Default Re: what is string and StringBuffer and StringBuilder?

    Quote Originally Posted by shirin View Post
    Can you explain more about string and StringBuffer and StringBuilder?
    In few words: strings (java.lang.String) are "immutable", once you have created a String object you can't change its state. java.lang.StringBuffer/StringBuilder are "mutable" buffers that can be used to build strings appending, inserting, deleting characters, etc..
    StringBuffer and StringBuilder have the same exact API (same methods, same parameters, changing just only some return types of StringBuffer vs StringBuilder). However, StringBuffer is "synchronized" and thread-safe. Since this synchronization is not always necessary, since Java 5 there is StringBuilder that is not synchronized and not thread-safe.
    Andrea, www.andbin.net SCJP 5 (91%) SCWCD 5 (94%)

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    ChristopherLowe (March 4th, 2014), shirin (March 4th, 2014)

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