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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 |
| Field Detail |
protected OutputStream out
| Constructor Detail |
public DataOutputStream(OutputStream out)
written is
set to zero.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. If no exception
is thrown, the counter written is incremented by
1.
Implements the write method of OutputStream.
b - the byte to be 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.b - the data.off - the start offset in the data.len - the number of bytes to write.
public void flush()
throws IOException
The flush method of DataOutputStream
calls the flush method of its underlying output stream.
public void close()
throws IOException
The close method
calls its flush method, and then calls the
close method of its underlying output stream.
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.
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.
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.
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.
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.
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.
public 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.s - a String value to be written.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. 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.
str - a string to be written.
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