org.apache.hadoop.io

类 LongWritable

java.lang.Object

org.apache.hadoop.io.LongWritable

所有已实现的接口:

Comparable, Writable, WritableComparable

public class LongWritable
extends Object
implements WritableComparable

A WritableComparable for longs.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	LongWritable.Comparator A Comparator optimized for LongWritable.
static class	LongWritable.DecreasingComparator A decreasing Comparator optimized for LongWritable.

构造器概要

构造器

构造器和说明
LongWritable()
LongWritable(long value)

方法概要

方法

限定符和类型	方法和说明
int	compareTo(Object o) Compares two LongWritables.
boolean	equals(Object o) Returns true iff o is a LongWritable with the same value.
long	get() Return the value of this LongWritable.
int	hashCode()
void	readFields(DataInput in) Deserialize the fields of this object from in.
void	set(long value) Set the value of this LongWritable.
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

构造器详细资料

LongWritable

public LongWritable()

LongWritable

public LongWritable(long value)

方法详细资料

set

public void set(long value)

Set the value of this LongWritable.

get

public long get()

Return the value of this LongWritable.

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

equals

public boolean equals(Object o)

Returns true iff o is a LongWritable with the same value.

覆盖:

equals 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

compareTo

public int compareTo(Object o)

Compares two LongWritables.

指定者:

compareTo 在接口中 Comparable

toString

public String toString()

覆盖:

toString 在类中 Object