public class DataOutputStream extends FilterOutputStream implements 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 out)
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 s)
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 s)
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 str)
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(OutputStream out)
written is
set to zero.out - the underlying output stream, to be saved for later
use.FilterOutputStream.outpublic 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 DataOutputwrite in class FilterOutputStreamb - the byte to be written.IOException - if an I/O error occurs.FilterOutputStream.outpublic 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 DataOutputwrite in class FilterOutputStreamb - the data.off - the start offset in the data.len - the number of bytes to write.IOException - if an I/O error occurs.FilterOutputStream.outpublic void flush()
throws IOException
The flush method of DataOutputStream
calls the flush method of its underlying output stream.
flush in interface Flushableflush in class FilterOutputStreamIOException - 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 DataOutputv - a boolean value to be written.IOException - if an I/O error occurs.FilterOutputStream.outpublic 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 DataOutputv - a byte value to be written.IOException - if an I/O error occurs.FilterOutputStream.outpublic 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 DataOutputv - a short to be written.IOException - if an I/O error occurs.FilterOutputStream.outpublic 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 DataOutputv - a char value to be written.IOException - if an I/O error occurs.FilterOutputStream.outpublic 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 DataOutputv - an int to be written.IOException - if an I/O error occurs.FilterOutputStream.outpublic 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 DataOutputv - a long to be written.IOException - if an I/O error occurs.FilterOutputStream.outpublic 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 DataOutputv - 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 DataOutputv - a double value to be written.IOException - if an I/O error occurs.FilterOutputStream.out,
Double.doubleToLongBits(double)public final void writeBytes(String s) throws IOException
written is incremented by the
length of s.writeBytes in interface DataOutputs - a string of bytes to be written.IOException - if an I/O error occurs.FilterOutputStream.outpublic final void writeChars(String s) throws IOException
writeChar method. If no exception is
thrown, the counter written is incremented by twice
the length of s.writeChars in interface DataOutputs - a String value to be written.IOException - if an I/O error occurs.writeChar(int),
FilterOutputStream.outpublic 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 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 DataOutputstr - 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 Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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