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.

Eerste pagina van API Java Inhoudsopgave 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.

Eerste pagina van API Java Inhoudsopgave 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.

Eerste pagina van API Java Inhoudsopgave 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

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Document heeft de 11/06/2005 gemaakt, de laatste keer de 04/03/2020 gewijzigd
Bron van het afgedrukte document:https://www.gaudry.be/nl/java-api-rf-java/io/DataOutputStream.html

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Referenties

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Inhoudsopgave Haut

Class DataOutputStream

Field Summary

Fields inherited from class java.io.FilterOutputStream

Constructor Summary

Method Summary

Methods inherited from class java.io.FilterOutputStream

Methods inherited from class java.lang.Object

Methods inherited from interface java.io.DataOutput

Field Detail

written

Constructor Detail

DataOutputStream

Method Detail

write

write

flush

writeBoolean

writeByte

writeShort

writeChar

writeInt

writeLong

writeFloat

writeDouble

writeBytes

writeChars

writeUTF

size

Referenties