java.lang.Object
- java.io.OutputStream
- - java.io.ByteArrayOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable
```
public class ByteArrayOutputStream
extends OutputStream
```
This class implements an output stream in which the data is written into a byte array. The buffer automatically grows as data is written to it. The data can be retrieved using toByteArray() and toString().
Closing a ByteArrayOutputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

Since:

JDK1.0

Field Summary

Fields
Modifier and Type Field and Description

protected byte[] buf
The buffer where data is stored.

protected int count
The number of valid bytes in the buffer.

Constructor Summary

Constructors
Constructor and Description
`ByteArrayOutputStream()` Creates a new byte array output stream.
`ByteArrayOutputStream(int size)` Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`close()` Closing a `ByteArrayOutputStream` has no effect.
`void`	`reset()` Resets the `count` field of this byte array output stream to zero, so that all currently accumulated output in the output stream is discarded.
`int`	`size()` Returns the current size of the buffer.
`byte[]`	`toByteArray()` Creates a newly allocated byte array.
`String`	`toString()` Converts the buffer's contents into a string decoding bytes using the platform's default character set.
`String`	`toString(int hibyte)` Deprecated. This method does not properly convert bytes into characters. As of JDK 1.1, the preferred way to do this is via the `toString(String enc)` method, which takes an encoding-name argument, or the `toString()` method, which uses the platform's default character encoding.
`String`	`toString(String charsetName)` Converts the buffer's contents into a string by decoding the bytes using the specified `charsetName`.
`void`	`write(byte[] b, int off, int len)` Writes `len` bytes from the specified byte array starting at offset `off` to this byte array output stream.
`void`	`write(int b)` Writes the specified byte to this byte array output stream.
`void`	`writeTo(OutputStream out)` Writes the complete contents of this byte array output stream to the specified output stream argument, as if by calling the output stream's write method using `out.write(buf, 0, count)`.

Methods inherited from class java.io.OutputStream
flush, write

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

- Field Detail
  - buf
```
protected byte[] buf
```
    The buffer where data is stored.
  - count
```
protected int count
```
    The number of valid bytes in the buffer.
- Constructor Detail
  - ByteArrayOutputStream
```
public ByteArrayOutputStream()
```
    Creates a new byte array output stream. The buffer capacity is initially 32 bytes, though its size increases if necessary.
  - ByteArrayOutputStream
```
public ByteArrayOutputStream(int size)
```
    Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.
    
    Parameters:
    size - the initial size.
    
    Throws:
    
    IllegalArgumentException - if size is negative.
- Method Detail
  - write
```
public void write(int b)
```
    Writes the specified byte to this byte array output stream.
    
    Specified by:
    
    write in class OutputStream
    
    Parameters:
    b - the byte to be written.
  - write
```
public void write(byte[] b,
         int off,
         int len)
```
    Writes len bytes from the specified byte array starting at offset off to this byte array output stream.
    
    Overrides:
    
    write in class OutputStream
    
    Parameters:
    b - the data.
    off - the start offset in the data.
    len - the number of bytes to write.
  - writeTo
```
public void writeTo(OutputStream out)
             throws IOException
```
    Writes the complete contents of this byte array output stream to the specified output stream argument, as if by calling the output stream's write method using out.write(buf, 0, count).
    
    Parameters:
    out - the output stream to which to write the data.
    
    Throws:
    
    IOException - if an I/O error occurs.
  - reset
```
public void reset()
```
    Resets the count field of this byte array output stream to zero, so that all currently accumulated output in the output stream is discarded. The output stream can be used again, reusing the already allocated buffer space.
    
    See Also:
    ByteArrayInputStream.count
  - toByteArray
```
public byte[] toByteArray()
```
    Creates a newly allocated byte array. Its size is the current size of this output stream and the valid contents of the buffer have been copied into it.
    
    Returns:
    the current contents of this output stream, as a byte array.
    See Also:
    size()
  - size
```
public int size()
```
    Returns the current size of the buffer.
    
    Returns:
    the value of the count field, which is the number of valid bytes in this output stream.
    See Also:
    count
  - toString
```
public String toString()
```
    Converts the buffer's contents into a string decoding bytes using the platform's default character set. The length of the new String is a function of the character set, and hence may not be equal to the size of the buffer.
    This method always replaces malformed-input and unmappable-character sequences with the default replacement string for the platform's default character set. The CharsetDecoder class should be used when more control over the decoding process is required.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    String decoded from the buffer's contents.
    Since:
    
    JDK1.1
  - toString
```
public String toString(String charsetName)
                throws UnsupportedEncodingException
```
    Converts the buffer's contents into a string by decoding the bytes using the specified charsetName. The length of the new String is a function of the charset, and hence may not be equal to the length of the byte array.
    This method always replaces malformed-input and unmappable-character sequences with this charset's default replacement string. The CharsetDecoder class should be used when more control over the decoding process is required.
    
    Parameters:
    charsetName - the name of a supported charset
    Returns: String decoded from the buffer's contents. Throws: UnsupportedEncodingException - If the named charset is not supported Since: JDK1.1
  toString @Deprecated public String toString(int hibyte) Deprecated. This method does not properly convert bytes into characters. As of JDK 1.1, the preferred way to do this is via the toString(String enc) method, which takes an encoding-name argument, or the toString() method, which uses the platform's default character encoding. Creates a newly allocated string. Its size is the current size of the output stream and the valid contents of the buffer have been copied into it. Each character c in the resulting string is constructed from the corresponding element b in the byte array such that: c == (char)(((hibyte & 0xff) << 8) | (b & 0xff)) Parameters: hibyte - the high byte of each resulting Unicode character. Returns: the current contents of the output stream, as a string. See Also: size(), toString(String), toString() close public void close() throws IOException Closing a ByteArrayOutputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException. Specified by: close in interface Closeable Specified by: close in interface AutoCloseable Overrides: close in class OutputStream Throws: IOException - if an I/O error occurs.

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Document créé le 31/08/2006, dernière modification le 04/03/2020
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`Références`

Manuel PHP : https://docs.oracle.com, ByteArrayOutputStream

Ces références et liens indiquent des documents consultés lors de la rédaction de cette page, ou qui peuvent apporter un complément d'information, mais les auteurs de ces sources ne peuvent être tenus responsables du contenu de cette page. L'auteur de ce site est seul responsable de la manière dont sont présentés ici les différents concepts, et des libertés qui sont prises avec les ouvrages de référence. N'oubliez pas que vous devez croiser les informations de sources multiples afin de diminuer les risques d'erreurs.

Table des matières Haut

Modifier and Type	Field and Description
`protected byte[]`	`buf` The buffer where data is stored.
`protected int`	`count` The number of valid bytes in the buffer.

Class ByteArrayOutputStream

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.io.OutputStream

Methods inherited from class java.lang.Object

Field Detail

buf

count

Constructor Detail

ByteArrayOutputStream

ByteArrayOutputStream

Method Detail

write

write

writeTo

reset

toByteArray

size

toString

toString

toString

close

Références

`Références`