NOTE: reverse() method is an instance method of StringBuilder class AND reverse() method is also an instance synchronized method of StringBuffer class in JAVA PLEASE NOTE THAT reverse() method is NOT ...
The characters in a string have indices that run from 0 to string.length() - 1. The method charAt() returns the character at a specified index. The boolean operator ( == ) returns true only if the two ...
为了实现修改字符序列的目的，StringBuffer和StringBuilder底层都是利用可修改的（char，JDK 9以后是byte）数组，二者都继承了AbstractStringBuilder，里面包含了基本操作，区别仅在于最终的方法是否加了synchronized。 另外，这个内部数组应该创建成多大的呢？
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