Comparison Charts - Java 2 Micro Edition Application Development - page 306

java.io

Table B.57. I n terfaces of the java.io Package

J2SE Interface Availability in CLDC

DataInput

Partially contained; see Table B.60 for details.

DataOutput Partially contained; see Table B.61 for details.

Externalizable

Not available in CLDC.

FileFilter

Not available in CLDC.

FilenameFilter Not available in CLDC.

ObjectInput Not available in CLDC.

ObjectInputValidation

Not available in CLDC.

ObjectOutput

Not available in CLDC.

ObjectStreamConstants Not available in CLDC.

Serializable Not available in CLDC.

Table B.58. Clas s es of the java.io Package

J2SE Class Availability in CLDC

BufferedInputStream,
BufferedOutputStream

Not available in CLDC.

BufferedReader, BufferedWriter Not available in CLDC.

Workaround for readLine() using PC and UNIX
encoding:

static String readLine (Reader
reader) throws IOException {
StringBuffer buf = new
StringBuffer();
while (true) {
int c = reader.read();
if (c == -1) {
if (buf.length() == 0) return
null;
break;
}
if (c == '\n') break;
if (c != '\r') buf.append ((char)
c);
}
return buf.toString();
}

ByteArrayInputStream

All J2SE methods are available in CLDC.

ByteArrayOutputStream

Partially contained; see Table B.62 for details.

Not available in CLDC.

CharArrayReader ,
CharArrayWriter

Partially contained; see Table B.63 and B.64 for
d etails.

DataInputStream ,
DataOutputStream

File , FileDescriptor ,
FileInputStream ,
FilePermission , FileReader ,
FileWriter

Files not available in CLDC. Use the classes of the
javax.microedition.rms as an alternative. For
accessing files on memory cards, some devices
may provide a file:// protocol implementation in the
generic connection framework (see Chapter 6 ,
"Networking: The Generic Connection Framework").