@GwtIncompatible public interface ByteArrayDataOutput extends DataOutput
DataOutput
for writing to in-memory byte arrays; its methods offer
identical functionality but do not throw IOException
.Modifier and Type | Method and Description |
---|---|
byte[] |
toByteArray()
Returns the contents that have been written to this instance, as a byte array.
|
void |
write(byte[] b)
Writes to the output stream all the bytes in array
b . |
void |
write(byte[] b,
int off,
int len)
Writes
len bytes from array
b , in order, to
the output stream. |
void |
write(int b)
Writes to the output stream the eight
low-order bits of the argument
b . |
void |
writeBoolean(boolean v)
Writes a
boolean value to this output stream. |
void |
writeByte(int v)
Writes to the output stream the eight low-
order bits of the argument
v . |
void |
writeBytes(String s)
Deprecated.
This method is dangerous as it discards the high byte of every character. For
UTF-8, use
write(s.getBytes(StandardCharsets.UTF_8)) . |
void |
writeChar(int v)
Writes a
char value, which
is comprised of two bytes, to the
output stream. |
void |
writeChars(String s)
Writes every character in the string
s ,
to the output stream, in order,
two bytes per character. |
void |
writeDouble(double v)
Writes a
double value,
which is comprised of eight bytes, to the output stream. |
void |
writeFloat(float v)
Writes a
float value,
which is comprised of four bytes, to the output stream. |
void |
writeInt(int v)
Writes an
int value, which is
comprised of four bytes, to the output stream. |
void |
writeLong(long v)
Writes a
long value, which is
comprised of eight bytes, to the output stream. |
void |
writeShort(int v)
Writes two bytes to the output
stream to represent the value of the argument.
|
void |
writeUTF(String s)
Writes two bytes of length information
to the output stream, followed
by the
modified UTF-8
representation
of every character in the string
s . |
void write(int b)
java.io.DataOutput
b
.
The 24 high-order bits of b
are ignored.write
in interface DataOutput
b
- the byte to be written.void write(byte[] b)
java.io.DataOutput
b
.
If b
is null
,
a NullPointerException
is thrown.
If b.length
is zero, then
no bytes are written. Otherwise, the byte
b[0]
is written first, then
b[1]
, and so on; the last byte
written is b[b.length-1]
.write
in interface DataOutput
b
- the data.void write(byte[] b, int off, int len)
java.io.DataOutput
len
bytes from array
b
, in order, to
the output stream. If b
is null
, a NullPointerException
is thrown. If off
is negative,
or len
is negative, or off+len
is greater than the length of the array
b
, then an IndexOutOfBoundsException
is thrown. If len
is zero,
then no bytes are written. Otherwise, the
byte b[off]
is written first,
then b[off+1]
, and so on; the
last byte written is b[off+len-1]
.write
in interface DataOutput
b
- the data.off
- the start offset in the data.len
- the number of bytes to write.void writeBoolean(boolean v)
java.io.DataOutput
boolean
value to this output stream.
If the argument v
is true
, the value (byte)1
is written; if v
is false
,
the value (byte)0
is written.
The byte written by this method may
be read by the readBoolean
method of interface DataInput
,
which will then return a boolean
equal to v
.writeBoolean
in interface DataOutput
v
- the boolean to be written.void writeByte(int v)
java.io.DataOutput
v
.
The 24 high-order bits of v
are ignored. (This means that writeByte
does exactly the same thing as write
for an integer argument.) The byte written
by this method may be read by the readByte
method of interface DataInput
,
which will then return a byte
equal to (byte)v
.writeByte
in interface DataOutput
v
- the byte value to be written.void writeShort(int v)
java.io.DataOutput
(byte)(0xff & (v >> 8))
(byte)(0xff & v)
The bytes written by this method may be
read by the readShort
method
of interface DataInput
, which
will then return a short
equal
to (short)v
.
writeShort
in interface DataOutput
v
- the short
value to be written.void writeChar(int v)
java.io.DataOutput
char
value, which
is comprised of two bytes, to the
output stream.
The byte values to be written, in the order
shown, are:
(byte)(0xff & (v >> 8))
(byte)(0xff & v)
The bytes written by this method may be
read by the readChar
method
of interface DataInput
, which
will then return a char
equal
to (char)v
.
writeChar
in interface DataOutput
v
- the char
value to be written.void writeInt(int v)
java.io.DataOutput
int
value, which is
comprised of four bytes, to the output stream.
The byte values to be written, in the order
shown, are:
(byte)(0xff & (v >> 24))
(byte)(0xff & (v >> 16))
(byte)(0xff & (v >> 8))
(byte)(0xff & v)
The bytes written by this method may be read
by the readInt
method of interface
DataInput
, which will then
return an int
equal to v
.
writeInt
in interface DataOutput
v
- the int
value to be written.void writeLong(long v)
java.io.DataOutput
long
value, which is
comprised of eight bytes, to the output stream.
The byte values to be written, in the order
shown, are:
(byte)(0xff & (v >> 56))
(byte)(0xff & (v >> 48))
(byte)(0xff & (v >> 40))
(byte)(0xff & (v >> 32))
(byte)(0xff & (v >> 24))
(byte)(0xff & (v >> 16))
(byte)(0xff & (v >> 8))
(byte)(0xff & v)
The bytes written by this method may be
read by the readLong
method
of interface DataInput
, which
will then return a long
equal
to v
.
writeLong
in interface DataOutput
v
- the long
value to be written.void writeFloat(float v)
java.io.DataOutput
float
value,
which is comprised of four bytes, to the output stream.
It does this as if it first converts this
float
value to an int
in exactly the manner of the Float.floatToIntBits
method and then writes the int
value in exactly the manner of the writeInt
method. The bytes written by this method
may be read by the readFloat
method of interface DataInput
,
which will then return a float
equal to v
.writeFloat
in interface DataOutput
v
- the float
value to be written.void writeDouble(double v)
java.io.DataOutput
double
value,
which is comprised of eight bytes, to the output stream.
It does this as if it first converts this
double
value to a long
in exactly the manner of the Double.doubleToLongBits
method and then writes the long
value in exactly the manner of the writeLong
method. The bytes written by this method
may be read by the readDouble
method of interface DataInput
,
which will then return a double
equal to v
.writeDouble
in interface DataOutput
v
- the double
value to be written.void writeChars(String s)
java.io.DataOutput
s
,
to the output stream, in order,
two bytes per character. If s
is null
, a NullPointerException
is thrown. If s.length
is zero, then no characters are written.
Otherwise, the character s[0]
is written first, then s[1]
,
and so on; the last character written is
s[s.length-1]
. For each character,
two bytes are actually written, high-order
byte first, in exactly the manner of the
writeChar
method.writeChars
in interface DataOutput
s
- the string value to be written.void writeUTF(String s)
java.io.DataOutput
s
.
If s
is null
,
a NullPointerException
is thrown.
Each character in the string s
is converted to a group of one, two, or
three bytes, depending on the value of the
character.
If a character c
is in the range \u0001
through
\u007f
, it is represented
by one byte:
(byte)c
If a character c
is \u0000
or is in the range \u0080
through \u07ff
, then it is
represented by two bytes, to be written
in the order shown:
(byte)(0xc0 | (0x1f & (c >> 6)))
(byte)(0x80 | (0x3f & c))
If a character
c
is in the range \u0800
through uffff
, then it is
represented by three bytes, to be written
in the order shown:
(byte)(0xe0 | (0x0f & (c >> 12)))
(byte)(0x80 | (0x3f & (c >> 6)))
(byte)(0x80 | (0x3f & c))
First,
the total number of bytes needed to represent
all the characters of s
is
calculated. If this number is larger than
65535
, then a UTFDataFormatException
is thrown. Otherwise, this length is written
to the output stream in exactly the manner
of the writeShort
method;
after this, the one-, two-, or three-byte
representation of each character in the
string s
is written.
The
bytes written by this method may be read
by the readUTF
method of interface
DataInput
, which will then
return a String
equal to s
.
writeUTF
in interface DataOutput
s
- the string value to be written.@Deprecated void writeBytes(String s)
write(s.getBytes(StandardCharsets.UTF_8))
.java.io.DataOutput
s
, taken in order, one byte
is written to the output stream. If
s
is null
, a NullPointerException
is thrown. If s.length
is zero, then no bytes are written. Otherwise,
the character s[0]
is written
first, then s[1]
, and so on;
the last character written is s[s.length-1]
.
For each character, one byte is written,
the low-order byte, in exactly the manner
of the writeByte
method . The
high-order eight bits of each character
in the string are ignored.
writeBytes
in interface DataOutput
s
- the string of bytes to be written.byte[] toByteArray()
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