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Variability

String classes usually use character arrays to hold strings, such as Private, final, char, and value [], so we say that string objects are immutable.

Both Stringbuffer and StringBuider inherit from the AbstractStringBuilder class, and AbstractStringBuilder also uses an array of characters to hold strings, char [] value, both of which are mutable.

Performance

When the String type is changed, a new String object is generated, and the pointer is then pointed at the new String object. StringBuffer operates on the StringBuffer object itself, rather than generating a new object and changing the object's reference. In the same case, you can only get a 10%-15% performance improvement by using StringBuilder compared with using StringBuffer, and you have to take the risk that multithreading is not safe.

Thread safety

The objects in String are immutable, and the above is all the contents of the collection of common Linux commands brought to you by Xiaobian. The solution is constant and thread safe. AbstractStringBuilder, as the common parent of StringBuilder and StringBuffer, defines the basic operations of related strings, such as expandCapacity, append, insert, indexOf and other public methods. StringBuffer adds a synchronization lock to the method or a synchronization lock to the called method, so the thread is safe. StringBuilder does not add a synchronization lock to the method, so it is not thread-safe.

A summary of the three

String: to manipulate a small amount of data

StringBuilder: single thread operates on string buffers and manipulates large amounts of data

StringBuffer: multithreading operates on string buffers and large amounts of data

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