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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object | +--java.io.OutputStream | +--java.io.DataOutputStream
A data input 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.
DataInputStream
Field Summary | |
protected OutputStream |
out
The output stream. |
Constructor Summary | |
DataOutputStream(OutputStream out)
Creates a new data output stream to write data to the specified underlying output stream. |
Method Summary | |
void |
close()
Closes this output stream and releases any system resources associated with the stream. |
void |
flush()
Flushes this data output stream. |
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. |
void |
write(int b)
Writes the specified byte (the low eight bits of the argument b ) to the underlying output stream. |
void |
writeBoolean(boolean v)
Writes a boolean to the underlying output stream as
a 1-byte value. |
void |
writeByte(int v)
Writes out a byte to the underlying output stream as
a 1-byte value. |
void |
writeChar(int v)
Writes a char to the underlying output stream as a
2-byte value, high byte first. |
void |
writeChars(String s)
Writes a string to the underlying output stream as a sequence of characters. |
void |
writeInt(int v)
Writes an int to the underlying output stream as four
bytes, high byte first. |
void |
writeLong(long v)
Writes a long to the underlying output stream as eight
bytes, high byte first. |
void |
writeShort(int v)
Writes a short to the underlying output stream as two
bytes, high byte first. |
void |
writeUTF(String str)
Writes a string to the underlying output stream using UTF-8 encoding in a machine-independent manner. |
Methods inherited from class java.io.OutputStream |
write |
Methods inherited from class java.lang.Object |
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface java.io.DataOutput |
write |
Field Detail |
protected OutputStream out
Constructor Detail |
public DataOutputStream(OutputStream out)
out
- the underlying output stream, to be saved for later
use.Method Detail |
public void write(int b) throws IOException
b
) to the underlying output stream.
Implements the write
method of OutputStream
.
write
in interface DataOutput
write
in class OutputStream
b
- the byte
to be written.IOException
- if an I/O error occurs.public void write(byte[] b, int off, int len) throws IOException
len
bytes from the specified byte array
starting at offset off
to the underlying output stream.write
in interface DataOutput
write
in class OutputStream
b
- the data.off
- the start offset in the data.len
- the number of bytes to write.IOException
- if an I/O error occurs.public void flush() throws IOException
The flush
method of DataOutputStream
calls the flush
method of its underlying output stream.
flush
in class OutputStream
IOException
- if an I/O error occurs.public void close() throws IOException
The close
method
calls its flush
method, and then calls the
close
method of its underlying output stream.
close
in class OutputStream
IOException
- if an I/O error occurs.public final void writeBoolean(boolean v) throws IOException
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
.writeBoolean
in interface DataOutput
v
- a boolean
value to be written.IOException
- if an I/O error occurs.public final void writeByte(int v) throws IOException
byte
to the underlying output stream as
a 1-byte value.writeByte
in interface DataOutput
v
- a byte
value to be written.IOException
- if an I/O error occurs.public final void writeShort(int v) throws IOException
short
to the underlying output stream as two
bytes, high byte first.writeShort
in interface DataOutput
v
- a short
to be written.IOException
- if an I/O error occurs.public final void writeChar(int v) throws IOException
char
to the underlying output stream as a
2-byte value, high byte first.writeChar
in interface DataOutput
v
- a char
value to be written.IOException
- if an I/O error occurs.public final void writeInt(int v) throws IOException
int
to the underlying output stream as four
bytes, high byte first.writeInt
in interface DataOutput
v
- an int
to be written.IOException
- if an I/O error occurs.public final void writeLong(long v) throws IOException
long
to the underlying output stream as eight
bytes, high byte first.writeLong
in interface DataOutput
v
- a long
to be written.IOException
- if an I/O error occurs.public final void writeChars(String s) throws IOException
writeChar
method.writeChars
in interface DataOutput
s
- a String
value to be written.IOException
- if an I/O error occurs.writeChar(int)
public final void writeUTF(String str) throws IOException
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 UTF-8 encoding
for the character.
writeUTF
in interface DataOutput
str
- a string to be written.IOException
- if an I/O error occurs.
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