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java.lang.Object java.io.OutputStream java.io.DataOutputStream
public class DataOutputStream
Transmits java data types as bytes over an OutputStream.
Field Summary | |
---|---|
protected OutputStream |
out
|
protected int |
written
|
Constructor Summary | |
---|---|
DataOutputStream(OutputStream out)
|
Method Summary | |
---|---|
void |
close()
Closes this data output stream. |
void |
flush()
Flushes this data output stream. |
int |
size()
Returns the current value of the counter written ,
the number of bytes written to this data output stream so far. |
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 |
writeBytes(String s)
|
void |
writeChar(int v)
Writes a char to the underlying output stream as a
2-byte value, high byte first. |
void |
writeChars(String s)
|
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. |
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. |
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. |
Methods inherited from class java.io.OutputStream |
---|
write |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
---|
protected int written
protected OutputStream out
Constructor Detail |
---|
public DataOutputStream(OutputStream out)
Method Detail |
---|
public void flush() throws IOException
The flush
method of DataOuputStream
calls the flush
method of its underlying output stream.
flush
in class OutputStream
IOException
- if an I/O error occurs.java.io.FilterOutputStream#out
,
OutputStream.flush()
public final int size()
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.
written
field.written
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.
If no exception is thrown, the counter written
is
incremented by len
.
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.java.io.FilterOutputStream#out
public void write(int b) throws IOException
b
) to the underlying output stream. If no exception
is thrown, the counter written
is incremented by
1
.
Implements the write
method of OutputStream
.
write
in class OutputStream
b
- the byte
to be written.
IOException
- if an I/O error occurs.java.io.FilterOutputStream#out
public void close() throws IOException
The close
method of DataOuputStream
calls the close
method of its underlying output stream.
close
in class OutputStream
IOException
- if an I/O error occurs.java.io.FilterOutputStream#out
,
OutputStream.flush()
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
. If no exception is
thrown, the counter written
is incremented by
1
.
v
- a boolean
value to be written.
IOException
- if an I/O error occurs.java.io.FilterOutputStream#out
public final void writeByte(int v) throws IOException
byte
to the underlying output stream as
a 1-byte value. If no exception is thrown, the counter
written
is incremented by 1
.
v
- a byte
value to be written.
IOException
- if an I/O error occurs.java.io.FilterOutputStream#out
public final void writeBytes(String s) throws IOException
IOException
public final void writeChar(int v) throws IOException
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
.
v
- a char
value to be written.
IOException
- if an I/O error occurs.java.io.FilterOutputStream#out
public final void writeChars(String s) throws IOException
IOException
public final void writeDouble(double v) throws IOException
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
.
v
- a double
value to be written.
IOException
- if an I/O error occurs.java.io.FilterOutputStream#out
,
Double.doubleToLongBits(double)
public final void writeFloat(float v) throws IOException
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
.
v
- a float
value to be written.
IOException
- if an I/O error occurs.java.io.FilterOutputStream#out
,
Float.floatToIntBits(float)
public final void writeInt(int v) throws IOException
int
to the underlying output stream as four
bytes, high byte first. If no exception is thrown, the counter
written
is incremented by 4
.
v
- an int
to be written.
IOException
- if an I/O error occurs.java.io.FilterOutputStream#out
public final void writeLong(long v) throws IOException
long
to the underlying output stream as eight
bytes, high byte first. In no exception is thrown, the counter
written
is incremented by 8
.
v
- a long
to be written.
IOException
- if an I/O error occurs.java.io.FilterOutputStream#out
public final void writeShort(int v) throws IOException
short
to the underlying output stream as two
bytes, high byte first. If no exception is thrown, the counter
written
is incremented by 2
.
v
- a short
to be written.
IOException
- if an I/O error occurs.java.io.FilterOutputStream#out
|
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