单选题Which methods from the String and StringBuffer classes modify the object on which they are called？（）AThe charAt（） method of the String class.BThe toUpperCase（） method of the String class.CThe replace（） method of the String class.DThe reverse（） method of the StringBuffer class.EThe length（） method of the StringBuffer class.
单选题
Which methods from the String and StringBuffer classes modify the object on which they are called？（）
A
The charAt（） method of the String class.
B
The toUpperCase（） method of the String class.
C
The replace（） method of the String class.
D
The reverse（） method of the StringBuffer class.
E
The length（） method of the StringBuffer class.
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