Difference Between StringBuffer and StringBuilder class
In this article, we are going to discuss the differences between the
StringBuilder class. And we will see why it
StringBuilder is preferable to
The String class is one of the most important classes in Java. In every day to day coding in Java, we use string many times.
We create a new string and perform various operations on it, like adding a character or removing a character, but do you know every time you operate on the string, each time a new string object is created and assigned to your current string variable.
Yes, it happens under the hood.
Most of us know that String is immutable. This means we can not edit the current string object, when we try to do it we are creating a new string object.
As I said in the very first line, String is one of the most important classes in Java and we use it many times in our code. The number of operations creates the same amount of garbage string objects, which put pressure on the Garbage Collector.
Taking this need into consideration the Java Team introduce
StringBuffer is mutable. You can edit it. But we can say that the Java Team was more concern about the correctness of the operations so they made it synchronized. All methods of the
StringBuffer class are synchronized.
But what does it mean by the word ‘synchronized’?
Synchronization is the capability to control the access of methods. An only a single thread can access a method at one time.
That means all the methods of the
StringBuffer class can be accessed by a single thread at a time.
After using it for a while, java developers feel that the
StringBuffer is taking more time because of synchronization. Making all methods of
StringBuffer class synchronized is not required. Then the Java team realize making
StringBuffer class synchronized wasn’t a great decision and they corrected it by introducing the
StringBuilder class in Java 1.5.
StringBuilder class is like
StringBuffer only but with one difference.
Now we will discuss the difference between the
StringBuilder class in detail.
To understand the difference between the
StringBuilder class we should first understand the need for the
We have discussed earlier that because of day to day use and a lot of pressure on the Garbage collector due to garbage string objects, the java team introduced
StringBuffer class. They made it synchronized in concern with the correctness.
StringBuffer class synchronized causing the performance issue and that’s why
Now you can learn the difference, the
StringBuffer class is synchronized while the
StringBuilder class is not.
But this is the main difference. We will discuss a few more differences which came into the existence because of this main difference.
|Speed||Since all methods of the
||Since none of the methods of the
|Efficiency||Slower nature makes
||Faster nature makes
In support of the above discussion, we will see the first paragraph from the Java API documentation of the
StringBuilder class, that states you should give preference to the
A mutable sequence of characters. This class provides an API compatible with
StringBuffer, but with no guarantee of synchronization. This class is designed for use as a drop-in replacement for
StringBufferin places where the string buffer was being used by a single thread (as is generally the case). Where possible, it is recommended that this class be used in preference to
StringBufferas it will be faster under most implementations.
Also, I will like to share one detail with you, when you perform the string concatenation operation and if you are using Java 1.4 or lower then java internally using
StringBuffer class for string concatenation operation.
After an introduction to
StringBuilder class in Java 1.5, from Java 1.5 and higher Java internally uses
StringBuilder class for string concatenation.
The most important difference between the
StringBuffer class and
StringBuilder class is
StringBuffer class takes more time as compare to
StringBuilder class for performing the same operation.
Taking efficiency into consideration, it is highly recommended to use
StringBuilder class instead of the old
Also, if you have other information about the difference between
StringBuffer class and
StringBuilder class please write it down in the comment section below.
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