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Chapter 11 The java.io Package |
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DataOutput
Name
DataOutputSynopsis
- 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.
- b
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- 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.
- b
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- 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
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.
- b
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- 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.
- v
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- 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.
- v
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- 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.
- s
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- 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.
- v
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- 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.
- s
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- 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.
- v
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- Description
-
This method writes a 64-bit double.
writeFloat
public abstract void writeFloat(float v) throws IOException
- Parameters
-
- v
-
The value to write.
- v
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- Description
-
This method writes a 32-bit float.
writeInt
public abstract void writeInt(int v) throws IOException
- Parameters
-
- v
-
The int value to write.
- v
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- Description
-
This method writes a 32-bit int.
writeLong
public abstract void writeLong(long v) throws IOException
- Parameters
-
- v
-
The long value to write.
- v
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- Description
-
This method writes a 64-bit long.
writeShort
public abstract void writeShort(int v) throws IOException
- Parameters
-
- v
-
The short value to write.
- v
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- Description
-
This method writes a 16-bit short.
writeUTF
public abstract void writeUTF(String str) throws IOException
- Parameters
-
- str
-
The String to write.
- str
- Throws
-
- IOException
-
If any kind of I/O error occurs.
- IOException
- 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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| DataInputStream |  |
DataOutputStream |
