Movatterモバイル変換

Class DataOutputStream

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

All Implemented Interfaces:
Closeable,DataOutput,Flushable,AutoCloseable
```
public classDataOutputStreamextendsFilterOutputStreamimplementsDataOutput
```
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:
1.0
See Also:
DataInputStream

Field Summary
Fields
Modifier and Type Field Description
protected int written
The number of bytes written to the data output stream so far.
- Fields declared in class java.io.FilterOutputStream
  out

Fields
Modifier and Type	Field	Description
`protected int`	`written`	The number of bytes written to the data output stream so far.

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

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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 usingmodified UTF-8 encoding in a machine-independent manner.

Methods declared in class java.io.FilterOutputStream
close,write

Methods declared in class java.io.OutputStream
nullOutputStream

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

Methods declared in 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 counterwritten 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)           throwsIOException
```
    Writes the specified byte (the low eight bits of the argumentb) to the underlying output stream. If no exception is thrown, the counterwritten is incremented by1.
    Implements thewrite method ofOutputStream.
    Specified by:
    write in interface DataOutput
    Overrides:
    write in class FilterOutputStream
    Parameters:
    b - thebyte 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)           throwsIOException
```
    Writeslen bytes from the specified byte array starting at offsetoff to the underlying output stream. If no exception is thrown, the counterwritten is incremented bylen.
    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()           throwsIOException
```
    Flushes this data output stream. This forces any buffered output bytes to be written out to the stream.
    Theflush method ofDataOutputStream calls theflush 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)                        throwsIOException
```
    Writes aboolean to the underlying output stream as a 1-byte value. The valuetrue is written out as the value(byte)1; the valuefalse is written out as the value(byte)0. If no exception is thrown, the counterwritten is incremented by1.
    Specified by:
    writeBoolean in interface DataOutput
    Parameters:
    v - aboolean value to be written.
    Throws:
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeByte
```
public final void writeByte(int v)                     throwsIOException
```
    Writes out abyte to the underlying output stream as a 1-byte value. If no exception is thrown, the counterwritten is incremented by1.
    Specified by:
    writeByte in interface DataOutput
    Parameters:
    v - abyte value to be written.
    Throws:
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeShort
```
public final void writeShort(int v)                      throwsIOException
```
    Writes ashort to the underlying output stream as two bytes, high byte first. If no exception is thrown, the counterwritten is incremented by2.
    Specified by:
    writeShort in interface DataOutput
    Parameters:
    v - ashort to be written.
    Throws:
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeChar
```
public final void writeChar(int v)                     throwsIOException
```
    Writes achar to the underlying output stream as a 2-byte value, high byte first. If no exception is thrown, the counterwritten is incremented by2.
    Specified by:
    writeChar in interface DataOutput
    Parameters:
    v - achar value to be written.
    Throws:
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeInt
```
public final void writeInt(int v)                    throwsIOException
```
    Writes anint to the underlying output stream as four bytes, high byte first. If no exception is thrown, the counterwritten is incremented by4.
    Specified by:
    writeInt in interface DataOutput
    Parameters:
    v - anint to be written.
    Throws:
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeLong
```
public final void writeLong(long v)                     throwsIOException
```
    Writes along to the underlying output stream as eight bytes, high byte first. In no exception is thrown, the counterwritten is incremented by8.
    Specified by:
    writeLong in interface DataOutput
    Parameters:
    v - along to be written.
    Throws:
    IOException - if an I/O error occurs.
    See Also:
    FilterOutputStream.out
  - writeFloat
```
public final void writeFloat(float v)                      throwsIOException
```
    Converts the float argument to anint using thefloatToIntBits method in classFloat, and then writes thatint value to the underlying output stream as a 4-byte quantity, high byte first. If no exception is thrown, the counterwritten is incremented by4.
    Specified by:
    writeFloat in interface DataOutput
    Parameters:
    v - afloat 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)                       throwsIOException
```
    Converts the double argument to along using thedoubleToLongBits method in classDouble, and then writes thatlong value to the underlying output stream as an 8-byte quantity, high byte first. If no exception is thrown, the counterwritten is incremented by8.
    Specified by:
    writeDouble in interface DataOutput
    Parameters:
    v - adouble 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)                      throwsIOException
```
    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 counterwritten is incremented by the length ofs.
    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)                      throwsIOException
```
    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 thewriteChar method. If no exception is thrown, the counterwritten is incremented by twice the length ofs.
    Specified by:
    writeChars in interface DataOutput
    Parameters:
    s - aString 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)                    throwsIOException
```
    Writes a string to the underlying output stream usingmodified UTF-8 encoding in a machine-independent manner.
    First, two bytes are written to the output stream as if by thewriteShort 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 counterwritten is incremented by the total number of bytes written to the output stream. This will be at least two plus the length ofstr, and at most two plus thrice the length ofstr.
    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 counterwritten, 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 thewritten field.
    See Also:
    written

Movatterモバイル変換

Class DataOutputStream

Field Summary

Fields declared in class java.io.FilterOutputStream

Constructor Summary

Method Summary

Methods declared in class java.io.FilterOutputStream

Methods declared in class java.io.OutputStream

Methods declared in class java.lang.Object

Methods declared in 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