com.aliyun.odps.io

Class DoubleWritable

java.lang.Object

com.aliyun.odps.io.DoubleWritable

All Implemented Interfaces:

Writable, WritableComparable, Comparable

public class DoubleWritable
extends Object
implements WritableComparable

DoubleWritable 提供了 double 的 Writable 和 WritableComparable 的实现

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DoubleWritable.Comparator DoubleWritable 对象的 WritableComparator 自然顺序实现（升序）.

Constructor Summary

Constructors

Constructor and Description
DoubleWritable() 默认构造 double 值为0.0的 DoubleWritable.
DoubleWritable(double value) 构造 double 值为给定 value 的 DoubleWritable.

Method Summary

Modifier and Type	Method and Description
int	compareTo(Object o) 比较两个 DoubleWritable 的值.
boolean	equals(Object o) 判断两个 DoubleWritable 是否相等.
double	get() 返回此 DoubleWritable 的值
int	hashCode() 计算哈希值，直接返回(int) Double.doubleToLongBits.
void	readFields(DataInput in) 从指定的 DataInput in 反序列化.
void	set(double value) 设置 DoubleWritable 的值
String	toString()
void	write(DataOutput out) 序列化到指定的 DataOutput out.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

DoubleWritable

public DoubleWritable()

默认构造 double 值为0.0的 DoubleWritable.

DoubleWritable

public DoubleWritable(double value)

构造 double 值为给定 value 的 DoubleWritable.

Parameters:

value -

Method Detail

readFields

public void readFields(DataInput in)
                throws IOException

Description copied from interface: Writable

从指定的 DataInput in 反序列化.

Specified by:

readFields in interface Writable

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Description copied from interface: Writable

序列化到指定的 DataOutput out.

Specified by:

write in interface Writable

Throws:

IOException

set

public void set(double value)

设置 DoubleWritable 的值

Parameters:

value -

get

public double get()

返回此 DoubleWritable 的值

Returns:

equals

public boolean equals(Object o)

判断两个 DoubleWritable 是否相等.

如果两个都是 DoubleWritable 且值相等，返回true，否则返回false

Overrides:

equals in class Object

Parameters:

o -

Returns:

hashCode

public int hashCode()

计算哈希值，直接返回(int) Double.doubleToLongBits.

Overrides:

hashCode in class Object

compareTo

public int compareTo(Object o)

比较两个 DoubleWritable 的值.

Specified by:

compareTo in interface Comparable

Parameters:

o - 比较对象

Returns:

(this < o ? -1 : (this == o) ? 0 ：1))

toString

public String toString()

Overrides:

toString in class Object