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Java 2 Platform SE v1.3.1: Class UID - JDK 5 Documentation v1.3.1, Java 2 SDK 英文文档

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java.rmi.server
Class UID

java.lang.Object
  |
  +--java.rmi.server.UID

All Implemented Interfaces:

Serializable

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public final class UID

extends Object

implements Serializable

Abstraction for creating identifiers that are unique with respect to the the host on which it is generated.

Since:

JDK1.1

See Also:

Serialized Form

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Constructor Summary

UID()           Creates a pure identifier that is unique with respect to the host on which it is generated.

UID(short num)           Creates a "well-known" ID.

 

Method Summary
boolean	equals(Object obj)           Compares two UIDs for content equality.
int	hashCode()           Returns a hashcode for the UID.
static UID	read(DataInput in)           Reads the UID from the input stream.
String	toString()           Returns the string representation of the UID.
void	write(DataOutput out)           Write the UID to output stream, out.

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

UID

public UID()

Creates a pure identifier that is unique with respect to the host on which it is generated. This UID is unique under the following conditions: a) the machine takes more than one second to reboot, and b) the machine's clock is never set backward. In order to construct a UID that is globally unique, simply pair a UID with an InetAddress.

Since:

JDK1.1

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UID

public UID(short num)

Creates a "well-known" ID. There are 2^16 -1 such possible well-known ids. An id generated via this constructor will not clash with any id generated via the default UID constructor which will generates a genuinely unique identifier with respect to this host.

Parameters:

num - well known ID number

Since:

JDK1.1

Method Detail

hashCode

public int hashCode()

Returns a hashcode for the UID. Two UIDs will have the same hashcode if they are equal with respect to their content.

Overrides:

hashCode in class Object

Returns:

the hashcode

Since:

JDK1.1

See Also:

Hashtable

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equals

public boolean equals(Object obj)

Compares two UIDs for content equality.

Overrides:

equals in class Object

Parameters:

obj - the Object to compare with

Returns:

true if these Objects are equal; false otherwise.

Since:

JDK1.1

See Also:

Hashtable

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toString

public String toString()

Returns the string representation of the UID.

Overrides:

toString in class Object

Since:

JDK1.1

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write

public void write(DataOutput out)
           throws IOException

Write the UID to output stream, out.

Parameters:

out - the output stream to which the UID is written

Throws:

IOException - if writing the UID to the stream fails.

Since:

JDK1.1

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read

public static UID read(DataInput in)
                throws IOException

Reads the UID from the input stream.

Parameters:

in - the input stream

Returns:

the UID

Throws:

IOException - if uid could not be read (due to stream failure or malformed UID)

Since:

JDK1.1

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