Mutable objects: the class StringBuffer

Next: Mutable objects: methods with Up: Unit 02 Previous: Immutable objects

Mutable objects: the class `StringBuffer`

Java has also a class that is very similar to String but whose instances are mutable objects: the class StringBuffer.

Specifically, the class StringBuffer has methods to modify the string represented by an object .

StringBuffer()
Constructs a string buffer with no characters in it and an initial capacity of 16 characters.

StringBuffer(String str)
Constructs a string buffer so that it represents the same sequence of characters as the string argument; in other words, the initial contents of the string buffer is a copy of the argument string.

StringBuffer append(String str)
          Appends the string to this string buffer.

StringBuffer insert(int offset, String str)
          Inserts the string into this string buffer.

StringBuffer replace(int start, int end, String str)
          Replaces the characters in a substring of this StringBuffer with characters in the specified String.

String toString()
          Converts to a string representing the data in this string buffer.

Next: Mutable objects: methods with Up: Unit 02 Previous: Immutable objects

`StringBuffer`	`append(String str)` Appends the string to this string buffer.
`StringBuffer`	`insert(int offset, String str)` Inserts the string into this string buffer.
`StringBuffer`	`replace(int start, int end, String str)` Replaces the characters in a substring of this `StringBuffer` with characters in the specified `String`.
`String`	`toString()` Converts to a string representing the data in this string buffer.