public class DataOutputStream extends FilterOutputStream implements DataOutput
A data output 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.
DataInputStreamprotected int written
The number of bytes written to the data output stream so far. If this counter overflows, it will be wrapped to Integer.MAX_VALUE.
public DataOutputStream(OutputStream out)
Creates a new data output stream to write data to the specified underlying output stream. The counter written is set to zero.
out - the underlying output stream, to be saved for later use.FilterOutputStream.outpublic void write(int b)
throws IOException Writes the specified byte (the low eight bits of the argument 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.outpublic void write(byte[] b,
int off,
int len)
throws IOException Writes 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.outpublic void flush()
throws IOException Flushes this data output stream. This forces any buffered output bytes to be written out to the stream.
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 Writes a 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.outpublic final void writeByte(int v)
throws IOException Writes out a 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.outpublic final void writeShort(int v)
throws IOException Writes a 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.outpublic final void writeChar(int v)
throws IOException Writes a 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.outpublic final void writeInt(int v)
throws IOException Writes an 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.outpublic final void writeLong(long v)
throws IOException Writes a 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.outpublic final void writeFloat(float v)
throws IOException 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. 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 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. 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(String s)
throws IOException Writes out the string to the underlying output stream as a sequence of bytes. Each character in the string is written out, in sequence, by discarding its high eight bits. If no exception is thrown, the counter 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.outpublic final void writeChars(String s)
throws IOException Writes a string to the underlying output stream as a sequence of characters. Each character is written to the data output stream as if by the 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(String str)
throws IOException Writes a string to the underlying output stream using modified UTF-8 encoding in a machine-independent manner.
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()
Returns the current value of the counter 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
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