java.lang.Object
- java.io.OutputStream
- - java.io.FilterOutputStream
  - - java.io.DataOutputStream

All Implemented Interfaces:

Closeable, DataOutput, Flushable, AutoCloseable
```
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.

Since:

JDK1.0

See Also:
DataInputStream

Field Summary
Fields
Modifier and Type Field and Description

protected int written
The number of bytes written to the data output stream so far.

DataOutputStream (Java Platform SE 7 ) Home of API Java Contents Haut
- Fields inherited from class java.io.FilterOutputStream out

Constructor Summary
Constructors
Constructor and Description

DataOutputStream(OutputStream out)
Creates a new data output stream to write data to the specified underlying output stream.

DataOutputStream (Java Platform SE 7 ) Home of API Java Contents Haut

Method Summary

Methods
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.

DataOutputStream (Java Platform SE 7 ) Home of API Java Contents Haut

Methods inherited from class java.io.FilterOutputStream close, write

Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.io.DataOutput write

- Field Detail
  - written
    protected 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.
- Constructor Detail
  - DataOutputStream
    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.
    
    Parameters:
    out - the underlying output stream, to be saved for later use.
    See Also:
    FilterOutputStream.out
- Method Detail
  - write
    public 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.
    
    Specified by:
    
    write in interface DataOutput
    
    Overrides:
    
    write in class FilterOutputStream
    
    Parameters:
    b - the byte to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - write
    public 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.
    
    Specified by:
    
    write in interface DataOutput
    
    Overrides:
    
    write in class FilterOutputStream
    
    Parameters:
    b - the data.
    off - the start offset in the data.
    len - the number of bytes to write.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - flush
    public 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.
    
    Specified by:
    
    flush in interface Flushable
    
    Overrides:
    
    flush in class FilterOutputStream
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out, OutputStream.flush()
  - writeBoolean
    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.
    
    Specified by:
    
    writeBoolean in interface DataOutput
    
    Parameters:
    v - a boolean value to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeByte
    public 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.
    
    Specified by:
    
    writeByte in interface DataOutput
    
    Parameters:
    v - a byte value to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeShort
    public 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.
    
    Specified by:
    
    writeShort in interface DataOutput
    
    Parameters:
    v - a short to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeChar
    public 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.
    
    Specified by:
    
    writeChar in interface DataOutput
    
    Parameters:
    v - a char value to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeInt
    public 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.
    
    Specified by:
    
    writeInt in interface DataOutput
    
    Parameters:
    v - an int to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeLong
    public 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.
    
    Specified by:
    
    writeLong in interface DataOutput
    
    Parameters:
    v - a long to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeFloat
    public 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.
    
    Specified by:
    
    writeFloat in interface DataOutput
    
    Parameters:
    v - a float value to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out, Float.floatToIntBits(float)
  - writeDouble
    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.
    
    Specified by:
    
    writeDouble in interface DataOutput
    
    Parameters:
    v - a double value to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out, Double.doubleToLongBits(double)
  - writeBytes
    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.
    
    Specified by:
    
    writeBytes in interface DataOutput
    
    Parameters:
    s - a string of bytes to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeChars
    public 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.
    
    Specified by:
    
    writeChars in interface DataOutput
    
    Parameters:
    s - a String value to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
    See Also:
    writeChar(int), FilterOutputStream.out
  - writeUTF
    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.
    
    Specified by:
    
    writeUTF in interface DataOutput
    
    Parameters:
    str - a string to be written.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - size
    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.
    
    Returns:
    the value of the written field.
    See Also:
    written

Document created the 11/06/2005, last modified the 04/03/2020
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References

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Class DataOutputStream

References