A String buffer is an efficient way to build a big string by appending small elements together.
Unlike String, an instance of StringBuf is not immutable in the sense that it can be passed as argument to functions which modify it by appending more values.
Creates a new StringBuf instance.
This may involve initialization of the internal buffer.
Appends the representation of
The exact representation of
x may vary per platform. To get more
consistent behavior, this function should be called with
x is null, the String "null" is appended.
Appends the character identified by
c is negative or has another invalid value, the result is
Appends a substring of
This function expects
len to describe a valid substring of
s, or else the result is unspecified. To get more robust behavior,
this.add(s.substr(pos,len)) can be used instead.
pos are null, the result is unspecified.
len is omitted or null, the substring ranges from
pos to the end