UTF8 (Hadoop 1.2.2-SNAPSHOT API)

java.lang.Object
- org.apache.hadoop.io.UTF8

所有已实现的接口:

Comparable<UTF8>, Writable, WritableComparable<UTF8>

已过时。
replaced by Text
```
@Deprecated
@InterfaceAudience.LimitedPrivate(value={"HDFS","MapReduce"})
@InterfaceStability.Stable
public class UTF8
extends Object
implements WritableComparable<UTF8>
```
A WritableComparable for strings that uses the UTF8 encoding.
Also includes utilities for efficiently reading and writing UTF-8. Note that this decodes UTF-8 but actually encodes CESU-8, a variant of UTF-8: see http://en.wikipedia.org/wiki/CESU-8

嵌套类概要

嵌套类
限定符和类型类和说明

static class UTF8.Comparator
已过时。

A WritableComparator optimized for UTF8 keys.

嵌套类
限定符和类型	类和说明
`static class`	`UTF8.Comparator` 已过时。 A WritableComparator optimized for UTF8 keys.

构造器概要

构造器
构造器和说明

UTF8()
已过时。

UTF8(String string)
已过时。

Construct from a given string.

UTF8(UTF8 utf8)
已过时。

Construct from a given string.

构造器
构造器和说明
`UTF8()` 已过时。
`UTF8(String string)` 已过时。 Construct from a given string.
`UTF8(UTF8 utf8)` 已过时。 Construct from a given string.

方法概要

方法
限定符和类型	方法和说明
`int`	`compareTo(UTF8 o)` 已过时。 Compare two UTF8s.
`boolean`	`equals(Object o)` 已过时。 Returns true iff `o` is a UTF8 with the same contents.
`static String`	`fromBytes(byte[] bytes)` 已过时。 Convert a UTF-8 encoded byte array back into a string.
`byte[]`	`getBytes()` 已过时。 The raw bytes.
`static byte[]`	`getBytes(String string)` 已过时。 Convert a string to a UTF-8 encoded byte array.
`int`	`getLength()` 已过时。 The number of bytes in the encoded string.
`int`	`hashCode()` 已过时。
`void`	`readFields(DataInput in)` 已过时。 Deserialize the fields of this object from `in`.
`static String`	`readString(DataInput in)` 已过时。 Read a UTF-8 encoded string.
`void`	`set(String string)` 已过时。 Set to contain the contents of a string.
`void`	`set(UTF8 other)` 已过时。 Set to contain the contents of a string.
`static void`	`skip(DataInput in)` 已过时。 Skips over one UTF8 in the input.
`String`	`toString()` 已过时。 Convert to a String.
`String`	`toStringChecked()` 已过时。 Convert to a string, checking for valid UTF8.
`void`	`write(DataOutput out)` 已过时。 Serialize the fields of this object to `out`.
`static int`	`writeString(DataOutput out, String s)` 已过时。 Write a UTF-8 encoded string.

从类继承的方法 java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- 构造器详细资料
  - UTF8
```
public UTF8()
```
    已过时。
  - UTF8
```
public UTF8(String string)
```
    已过时。
    
    Construct from a given string.
  - UTF8
```
public UTF8(UTF8 utf8)
```
    已过时。
    
    Construct from a given string.
- 方法详细资料
  - getBytes
```
public byte[] getBytes()
```
    已过时。
    
    The raw bytes.
  - getLength
```
public int getLength()
```
    已过时。
    
    The number of bytes in the encoded string.
  - set
```
public void set(String string)
```
    已过时。
    
    Set to contain the contents of a string.
  - set
```
public void set(UTF8 other)
```
    已过时。
    
    Set to contain the contents of a string.
  - readFields
```
public void readFields(DataInput in)
                throws IOException
```
    已过时。
    
    从接口复制的说明: Writable
    
    Deserialize the fields of this object from in.
    For efficiency, implementations should attempt to re-use storage in the existing object where possible.
    
    指定者:
    
    readFields 在接口中 Writable
    
    参数:
    in - DataInput to deseriablize this object from.
    
    抛出:
    
    IOException
  - skip
```
public static void skip(DataInput in)
                 throws IOException
```
    已过时。
    
    Skips over one UTF8 in the input.
    
    抛出:
    
    IOException
  - write
```
public void write(DataOutput out)
           throws IOException
```
    已过时。
    
    从接口复制的说明: Writable
    
    Serialize the fields of this object to out.
    
    指定者:
    
    write 在接口中 Writable
    
    参数:
    out - DataOuput to serialize this object into.
    
    抛出:
    
    IOException
  - compareTo
```
public int compareTo(UTF8 o)
```
    已过时。
    
    Compare two UTF8s.
    
    指定者:
    
    compareTo 在接口中 Comparable<UTF8>
  - toString
```
public String toString()
```
    已过时。
    
    Convert to a String.
    
    覆盖:
    
    toString 在类中 Object
  - toStringChecked
```
public String toStringChecked()
                       throws IOException
```
    已过时。
    
    Convert to a string, checking for valid UTF8.
    
    返回:
    the converted string
    
    抛出:
    
    UTFDataFormatException - if the underlying bytes contain invalid UTF8 data.
    
    IOException
  - equals
```
public boolean equals(Object o)
```
    已过时。
    
    Returns true iff o is a UTF8 with the same contents.
    
    覆盖:
    
    equals 在类中 Object
  - hashCode
```
public int hashCode()
```
    已过时。
    
    覆盖:
    
    hashCode 在类中 Object
  - getBytes
```
public static byte[] getBytes(String string)
```
    已过时。
    
    Convert a string to a UTF-8 encoded byte array.
    
    另请参阅:
    String.getBytes(String)
  - fromBytes
```
public static String fromBytes(byte[] bytes)
                        throws IOException
```
    已过时。
    
    Convert a UTF-8 encoded byte array back into a string.
    
    抛出:
    
    IOException - if the byte array is invalid UTF8
  - readString
```
public static String readString(DataInput in)
                         throws IOException
```
    已过时。
    
    Read a UTF-8 encoded string.
    
    抛出:
    
    IOException
    另请参阅:
    DataInput.readUTF()
  - writeString
```
public static int writeString(DataOutput out,
              String s)
                       throws IOException
```
    已过时。
    
    Write a UTF-8 encoded string.
    
    抛出:
    
    IOException
    另请参阅:
    DataOutput.writeUTF(String)

类 UTF8

嵌套类概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

UTF8

UTF8

UTF8

方法详细资料

getBytes

getLength

set

set

readFields

skip

write

compareTo

toString

toStringChecked

equals

hashCode

getBytes

fromBytes

readString

writeString