public class DataOutputStream extends FilterOutputStreamimplements DataOutput
DataInputStream
| Modifier and Type | Field and Description |
|---|---|
protected int |
written
The number of bytes written to the data output stream so far.
|
out| Constructor and Description |
|---|
DataOutputStream(OutputStream
Creates a new data output stream to write data to the specified underlying output stream.
|
| Modifier and Type | Method and Description |
|---|---|
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
Writes out the string to the underlying output stream as a sequence of bytes.
|
void |
writeChar(int v)
Writes a
char to the underlying output stream as a 2-byte value, high byte first.
|
void |
writeChars(String
Writes a string to the underlying output stream as a sequence of characters.
|
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.
|
void |
writeUTF(String
Writes a string to the underlying output stream using
modified UTF-8 encoding in a machine-independent manner.
|
close, writeclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitwriteprotected int written
public DataOutputStream(OutputStreamout)
written is set to zero.
out - the underlying output stream, to be saved for later use.
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 interface
DataOutput
write in class
FilterOutputStream
b - the
byte to be written.
IOException - if an I/O error occurs.
FilterOutputStream.out
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 interface
DataOutput
write in class
FilterOutputStream
b - the data.
off - the start offset in the data.
len - the number of bytes to write.
IOException - if an I/O error occurs.
FilterOutputStream.out
public void flush()
throws IOException
The flush method of DataOutputStream calls the flush method of its underlying output stream.
flush in interface
Flushable
flush in class
FilterOutputStream
IOException - if an I/O error occurs.
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.
writeBoolean in interface
DataOutput
v - a
boolean value to be written.
IOException - if an I/O error occurs.
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.
writeByte in interface
DataOutput
v - a
byte value to be written.
IOException - if an I/O error occurs.
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.
writeShort in interface
DataOutput
v - a
short to be written.
IOException - if an I/O error occurs.
FilterOutputStream.out
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.
writeChar in interface
DataOutput
v - a
char value to be written.
IOException - if an I/O error occurs.
FilterOutputStream.out
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.
writeInt in interface
DataOutput
v - an
int to be written.
IOException - if an I/O error occurs.
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.
writeLong in interface
DataOutput
v - a
long to be written.
IOException - if an I/O error occurs.
FilterOutputStream.out
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.
writeFloat in interface
DataOutput
v - a
float value to be written.
IOException - if an I/O error occurs.
FilterOutputStream.out ,
Float.floatToIntBits(float)
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.
writeDouble in interface
DataOutput
v - a
double value to be written.
IOException - if an I/O error occurs.
FilterOutputStream.out ,
Double.doubleToLongBits(double)
public final void writeBytes(Strings) throws IOException
written is incremented by the length of
s.
writeBytes in interface
DataOutput
s - a string of bytes to be written.
IOException - if an I/O error occurs.
FilterOutputStream.out
public final void writeChars(Strings) throws IOException
writeChar method. If no exception is thrown, the counter
written is incremented by twice the length of
s.
writeChars in interface
DataOutput
s - a
String value to be written.
IOException - if an I/O error occurs.
writeChar(int),
FilterOutputStream.out
public final void writeUTF(Stringstr) 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 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.
writeUTF in interface
DataOutput
str - a string to be written.
IOException - if an I/O error occurs.
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