StringBuffer is an array of characters that can be
expanded or contracted as necessary.
typically used to construct an array of characters that is then converted
into an immutable
The characters that make up the content of a
are held in an internal array. The number of entries in the array is referred
to as the capacity of the
while the actual number of characters in use is referred to as its
StringBuffer is constructed
with a specific initial capacity (the default is 16 characters). It can also
be constructed from the content of a
String, in which case
an appropriate initial capacity is determined. When the size approaches the
capacity, a new character array is allocated and the existing characters are
copied into it. Note that this can be a costly operation that may have to be
repeated if the
StringBuffer’s size grows continuously. If
StringBuffer should be created with sufficient
capacity to hold all of the characters that it will contain.
Following construction, the
ensureCapacity() method is
used to ensure that the internal array can hold at least the number of
characters specified without needing to be expanded any further.
capacity() returns the current capacity of the
its actual size. The actual number of characters in use can be changed by
setLength() method. If the new length is smaller than the old length, the characters ...