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Java Fundamental Classes Reference

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The java.io Package
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DataOutput

Name

DataOutput

Synopsis

Interface Name:

java.io.DataOutput

Super-interface:

None

Immediate Sub-interfaces:

java.io.ObjectOutput

Implemented By:

java.io.DataOutputStream, java.io.RandomAccessFile

Availability:

JDK 1.0 or later

Description

The DataOutput interface defines methods for writing primitive data types to an output stream in a machine-independent manner. All multibyte quantities are written in a format that stores the most significant byte as the first byte and the least significant byte as the last byte.

Interface Declaration

public abstract interface java.io.DataOutput {
  // Methods
  public abstract void write(byte[] b);
  public abstract void write(byte[] b, int off, int len);
  public abstract void write(int b);
  public abstract void writeBoolean(boolean v);
  public abstract void writeByte(int v);
  public abstract void writeBytes(String s);
  public abstract void writeChar(int v);
  public abstract void writeChars(String s);
  public abstract void writeDouble(double v);
  public abstract void writeFloat(float v);
  public abstract void writeInt(int v);
  public abstract void writeLong(long v);
  public abstract void writeShort(int v);
  public abstract void writeUTF(String str);
}

Methods

write

public abstract void write(int b) throws IOException

Parameters

b

The value to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes the low-order 8 bits of the given integer b.

public abstract void write(byte[] b) throws IOException

Parameters

b

An array of values to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes all of the 8-bit bytes in the given array.

 public abstract void write(byte[] b, int off, int len) throws IOException 

Parameters

b

An array of values to write.

off

An offset into the array.

len

The number of bytes to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes len bytes from the given array, starting off elements from the beginning of the array.

writeBoolean

public abstract void writeBoolean(boolean v) throws IOException

Parameters

v

The boolean value to write.

Throws

IOException

If any kind of I/O error occurs.

Description

If v is true, this method writes a byte that contains the value 1. If v is false, the method writes a byte that contains the value 0.

writeByte

public abstract void writeByte(int v) throws IOException

Parameters

v

The value to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes an 8-bit byte using the low-order eight bits of the integer v.

writeBytes

public abstract void writeBytes(String s) throws IOException

Parameters

s

The String to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes the characters in the given String as a sequence of 8-bit bytes. The high-order bytes of the characters in the string are ignored.

writeChar

public abstract void writeChar(int v) throws IOException

Parameters

v

The value to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes a 16-bit char using the low-order 16 bits of the given integer v.

writeChars

public abstract void writeChars(String s) throws IOException

Parameters

s

The String to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes the characters in the given String object as a sequence of 16-bit characters.

writeDouble

public abstract void writeDouble(double v) throws IOException

Parameters

v

The double value to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes a 64-bit double.

writeFloat

public abstract void writeFloat(float v) throws IOException

Parameters

v

The value to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes a 32-bit float.

writeInt

public abstract void writeInt(int v) throws IOException

Parameters

v

The int value to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes a 32-bit int.

writeLong

public abstract void writeLong(long v) throws IOException

Parameters

v

The long value to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes a 64-bit long.

writeShort

public abstract void writeShort(int v) throws IOException

Parameters

v

The short value to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes a 16-bit short.

writeUTF

public abstract void writeUTF(String str) throws IOException

Parameters

str

The String to write.

Throws

IOException

If any kind of I/O error occurs.

Description

This method writes the given String using UTF-8 encoding. See Appendix B, The UTF-8 Encoding for information on the UTF-8 encoding.

See Also

DataOutputStream, IOException, ObjectOutput, RandomAccessFile


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