Uses of Class
java.lang.StringBuffer

Packages that use StringBuffer 
Package Description
java.io
Provides for system input and output through data streams, serialization and the file system.
java.lang
Provides classes that are fundamental to the design of the Java programming language.
java.text
Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages.
java.util.regex
Classes for matching character sequences against patterns specified by regular expressions.
javax.swing.text.html.parser
Provides the default HTML parser, along with support classes.