Class Library: CLDC Packages - Java 2 Micro Edition Application Development - page 245

Appendix A. Class Library: CLDC Packages

IN THIS APPENDIX

• The java.io Package
• The java.lang Package
• The java.lang.ref Package
• The java.util Package
• The javax.microedition.io Package
• MIDP-Specific Packages
• PDAP-Specific Packages

This appendix gives an overview of the API provided in the Connected Limited Device
Configuration (CLDC) version 1.0 and version 1.1 also called CLDC Next Generation (NG). It
also lists profile-related additions to the configurations.

The java.io Package

The java.io package contains all the interfaces, classes, and exceptions that provide a mechanism
for system input and output through data streams.

Interfaces

DataInput The DataInput interface provides methods for reading binary streams and
converting them into Java primitive data types.
DataOutput The DataOutput interface provides methods for writing/converting Java
p rimitive data types to a binary stream.

Classes

ByteArrayInputStream The ByteArrayInputStream encapsulates an InputStream
that uses a byte array as a buffer that might be read from a
s tream.
ByteArrayOutputStream The ByteArrayOutputStream provides an OutputStream
t hat might be used to write data to a byte array.

DataInputStream The DataInputStream implements the DataInput interface

and provides methods to read primitive Java data types from a
s tream.

DataOutputStream The DataOutputStream implements the DataOutput

interface and provides methods to write primitive Java data
t ypes to a stream.

InputStream

The InputStream is the abstract superclass of all byte-related
i nput streams.

InputStreamReader

The InputStreamReader closes the gap between byte-related
input streams and character-related input streams. Bytes that
a re read using this class are internally converted to characters.

OutputStream The OutputStream is the abstract superclass of all byte-

r elated output streams.