String,StringBuffer,StringBuilder这三个类都实现了同样的接口,java.io.Serializable, Comparable<String>, CharSequence也就是说他们大概的功能都是相同的,但是因为某些微小的变化导致了他们存在一些功能的差异。
首先:String一旦new出来值将不会改变,
JDK分析
private final char value[];
StringBuffer,StringBuilder的值都是可以改变的,
char value[];
第二:StringBuffer,StringBuilder性能差异
StringBuffer线程安全的
/**
* A thread-safe, mutable sequence of characters.
* A string buffer is like a {@link String}, but can be modified. At any
* point in time it contains some particular sequence of characters, but
* the length and content of the sequence can be changed through certain
* method calls.
* <p>
* String buffers are safe for use by multiple threads. The methods
* are synchronized where necessary so that all the operations on any
* particular instance behave as if they occur in some serial order
* that is consistent with the order of the method calls made by each of
* the individual threads involved.
* <p>
* The principal operations on a <code>StringBuffer</code> are the
* <code>append</code> and <code>insert</code> methods, which are
* overloaded so as to accept data of any type. Each effectively
* converts a given datum to a string and then appends or inserts the
* characters of that string to the string buffer. The
* <code>append</code> method always adds these characters at the end
* of the buffer; the <code>insert</code> method adds the characters at
* a specified point.
* <p>
而StringBuilder却不是的,
/**
* A mutable sequence of characters. This class provides an API compatible
* with <code>StringBuffer</code>, but with no guarantee of synchronization.
* This class is designed for use as a drop-in replacement for
* <code>StringBuffer</code> in 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
* <code>StringBuffer</code> as it will be faster under most implementations.
*
综合而言,String的值无法改变,StringBuffer,StringBuilder可以,但是StringBuilder的性能比
StringBuffer更高。
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