org.apache.hadoop.mapreduce

类 ID

java.lang.Object

org.apache.hadoop.mapreduce.ID

所有已实现的接口:

Comparable<ID>, Writable, WritableComparable<ID>

直接已知子类:

ID

public abstract class ID
extends Object
implements WritableComparable<ID>

A general identifier, which internally stores the id as an integer. This is the super class of JobID, TaskID and TaskAttemptID.

另请参阅:

JobID, TaskID, TaskAttemptID

字段概要

字段

限定符和类型	字段和说明
protected int	id
protected static char	SEPARATOR

构造器概要

构造器

限定符	构造器和说明
protected	ID()
	ID(int id) constructs an ID object from the given int

方法概要

方法

限定符和类型	方法和说明
int	compareTo(ID that) Compare IDs by associated numbers
boolean	equals(Object o)
int	getId() returns the int which represents the identifier
int	hashCode()
void	readFields(DataInput in) Deserialize the fields of this object from in.
String	toString()
void	write(DataOutput out) Serialize the fields of this object to out.

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

字段详细资料

SEPARATOR

protected static final char SEPARATOR

另请参阅:

常量字段值

id

protected int id

构造器详细资料

ID

public ID(int id)

constructs an ID object from the given int

ID

protected ID()

方法详细资料

getId

public int getId()

returns the int which represents the identifier

toString

public String toString()

覆盖:

toString 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

equals

public boolean equals(Object o)

覆盖:

equals 在类中 Object

compareTo

public int compareTo(ID that)

Compare IDs by associated numbers

指定者:

compareTo 在接口中 Comparable<ID>

readFields

public void readFields(DataInput in)
                throws IOException

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

write

public void write(DataOutput out)
           throws IOException

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