DataOutputStream
public
class
DataOutputStream
extends FilterOutputStream
implements
DataOutput
| java.lang.Object | |||
| ↳ | java.io.OutputStream | ||
| ↳ | java.io.FilterOutputStream | ||
| ↳ | java.io.DataOutputStream | ||
A data output stream lets an application write primitive Java data types to an output stream in a portable way. An application can then use a data input stream to read the data back in.
See also:
Summary
Fields | |
|---|---|
protected
int |
written
The number of bytes written to the data output stream so far. |
Inherited fields |
|---|
java.io.FilterOutputStream
|
Public constructors | |
|---|---|
DataOutputStream(OutputStream out)
Creates a new data output stream to write data to the specified underlying output stream. |
|
Public methods | |
|---|---|
void
|
flush()
Flushes this data output stream. |
final
int
|
size()
Returns the current value of the counter |
void
|
write(byte[] b, int off, int len)
Writes |
void
|
write(int b)
Writes the specified byte (the low eight bits of the argument
|
final
void
|
writeBoolean(boolean v)
Writes a |
final
void
|
writeByte(int v)
Writes out a |
final
void
|
writeBytes(String s)
Writes out the string to the underlying output stream as a sequence of bytes. |
final
void
|
writeChar(int v)
Writes a |
final
void
|
writeChars(String s)
Writes a string to the underlying output stream as a sequence of characters. |
final
void
|
writeDouble(double v)
Converts the double argument to a |
final
void
|
writeFloat(float v)
Converts the float argument to an |
final
void
|
writeInt(int v)
Writes an |
final
void
|
writeLong(long v)
Writes a |
final
void
|
writeShort(int v)
Writes a |
final
void
|
writeUTF(String str)
Writes a string to the underlying output stream using modified UTF-8 encoding in a machine-independent manner. |
Inherited methods | |
|---|---|
java.io.FilterOutputStream
| |
java.io.OutputStream
| |
java.lang.Object
| |
java.io.Closeable
| |
java.io.Flushable
| |
java.io.DataOutput
| |
java.lang.AutoCloseable
| |
Fields
written
int written
The number of bytes written to the data output stream so far. If this counter overflows, it will be wrapped to Integer.MAX_VALUE.
Public constructors
DataOutputStream
DataOutputStream (OutputStream out)
Creates a new data output stream to write data to the specified
underlying output stream. The counter written is
set to zero.
| Parameters | |
|---|---|
out |
OutputStream:
the underlying output stream, to be saved for later
use. |
See also:
Public methods
flush
void flush ()
Flushes this data output stream. This forces any buffered output bytes to be written out to the stream.
The flush method of DataOutputStream
calls the flush method of its underlying output stream.
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
size
int size ()
Returns the current value of the counter written,
the number of bytes written to this data output stream so far.
If the counter overflows, it will be wrapped to Integer.MAX_VALUE.
| Returns | |
|---|---|
int |
the value of the written field. |
See also:
write
void write (byte[] b,
int off,
int len)
Writes len bytes from the specified byte array
starting at offset off to the underlying output stream.
If no exception is thrown, the counter written is
incremented by len.
| Parameters | |
|---|---|
b |
byte:
the data. |
off |
int:
the start offset in the data. |
len |
int:
the number of bytes to write. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
See also:
write
void write (int b)
Writes the specified byte (the low eight bits of the argument
b) to the underlying output stream. If no exception
is thrown, the counter written is incremented by
1.
Implements the write method of OutputStream.
| Parameters | |
|---|---|
b |
int:
the byte to be written. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
See also:
writeBoolean
void writeBoolean (boolean v)
Writes a boolean to the underlying output stream as
a 1-byte value. The value true is written out as the
value (byte)1; the value false is
written out as the value (byte)0. If no exception is
thrown, the counter written is incremented by
1.
| Parameters | |
|---|---|
v |
boolean:
a boolean value to be written. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
See also:
writeByte
void writeByte (int v)
Writes out a byte to the underlying output stream as
a 1-byte value. If no exception is thrown, the counter
written is incremented by 1.
| Parameters | |
|---|---|
v |
int:
a byte value to be written. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
See also:
writeBytes
void writeBytes (String s)
Writes out the string to the underlying output stream as a
sequence of bytes. Each character in the string is written out, in
sequence, by discarding its high eight bits. If no exception is
thrown, the counter written is incremented by the
length of s.
| Parameters | |
|---|---|
s |
String:
a string of bytes to be written. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
See also:
writeChar
void writeChar (int v)
Writes a char to the underlying output stream as a
2-byte value, high byte first. If no exception is thrown, the
counter written is incremented by 2.
| Parameters | |
|---|---|
v |
int:
a char value to be written. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
See also:
writeChars
void writeChars (String s)
Writes a string to the underlying output stream as a sequence of
characters. Each character is written to the data output stream as
if by the writeChar method. If no exception is
thrown, the counter written is incremented by twice
the length of s.
| Parameters | |
|---|---|
s |
String:
a String value to be written. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
See also:
writeDouble
void writeDouble (double v)
Converts the double argument to a long using the
doubleToLongBits method in class Double,
and then writes that long value to the underlying
output stream as an 8-byte quantity, high byte first. If no
exception is thrown, the counter written is
incremented by 8.
| Parameters | |
|---|---|
v |
double:
a double value to be written. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
See also:
writeFloat
void writeFloat (float v)
Converts the float argument to an int using the
floatToIntBits method in class Float,
and then writes that int value to the underlying
output stream as a 4-byte quantity, high byte first. If no
exception is thrown, the counter written is
incremented by 4.
| Parameters | |
|---|---|
v |
float:
a float value to be written. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
See also:
writeInt
void writeInt (int v)
Writes an int to the underlying output stream as four
bytes, high byte first. If no exception is thrown, the counter
written is incremented by 4.
| Parameters | |
|---|---|
v |
int:
an int to be written. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
See also:
writeLong
void writeLong (long v)
Writes a long to the underlying output stream as eight
bytes, high byte first. In no exception is thrown, the counter
written is incremented by 8.
| Parameters | |
|---|---|
v |
long:
a long to be written. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
See also:
writeShort
void writeShort (int v)
Writes a short to the underlying output stream as two
bytes, high byte first. If no exception is thrown, the counter
written is incremented by 2.
| Parameters | |
|---|---|
v |
int:
a short to be written. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
See also:
writeUTF
void writeUTF (String str)
Writes a string to the underlying output stream using modified UTF-8 encoding in a machine-independent manner.
First, two bytes are written to the output stream as if by the
writeShort method giving the number of bytes to
follow. This value is the number of bytes actually written out,
not the length of the string. Following the length, each character
of the string is output, in sequence, using the modified UTF-8 encoding
for the character. If no exception is thrown, the counter
written is incremented by the total number of
bytes written to the output stream. This will be at least two
plus the length of str, and at most two plus
thrice the length of str.
| Parameters | |
|---|---|
str |
String:
a string to be written. |
| Throws | |
|---|---|
IOException |
if an I/O error occurs. |
Interfaces
Classes
- BufferedInputStream
- BufferedOutputStream
- BufferedReader
- BufferedWriter
- ByteArrayInputStream
- ByteArrayOutputStream
- CharArrayReader
- CharArrayWriter
- Console
- DataInputStream
- DataOutputStream
- File
- FileDescriptor
- FileInputStream
- FileOutputStream
- FilePermission
- FileReader
- FileWriter
- FilterInputStream
- FilterOutputStream
- FilterReader
- FilterWriter
- InputStream
- InputStreamReader
- LineNumberInputStream
- LineNumberReader
- ObjectInputStream
- ObjectInputStream.GetField
- ObjectOutputStream
- ObjectOutputStream.PutField
- ObjectStreamClass
- ObjectStreamField
- OutputStream
- OutputStreamWriter
- PipedInputStream
- PipedOutputStream
- PipedReader
- PipedWriter
- PrintStream
- PrintWriter
- PushbackInputStream
- PushbackReader
- RandomAccessFile
- Reader
- SequenceInputStream
- SerializablePermission
- StreamTokenizer
- StringBufferInputStream
- StringReader
- StringWriter
- Writer
Exceptions
- CharConversionException
- EOFException
- FileNotFoundException
- InterruptedIOException
- InvalidClassException
- InvalidObjectException
- IOException
- NotActiveException
- NotSerializableException
- ObjectStreamException
- OptionalDataException
- StreamCorruptedException
- SyncFailedException
- UncheckedIOException
- UnsupportedEncodingException
- UTFDataFormatException
- WriteAbortedException
Errors

