Java compact2, compact3 java.rmi.server Class UID（JDK8）

Constructor Detail

• UID

  public UID()

  Generates a UID that is unique over time with respect to the host that it was generated on.

• UID

  public UID(short num)

  Creates a "well-known" UID. There are 2¹⁶ possible such well-known ids.

  A UID created via this constructor will not clash with any UIDs generated via the no-arg constructor.

  Parameters:

  num - number for well-known UID

Method Detail

• hashCode

  public int hashCode()

  Returns the hash code value for this UID.

  Overrides:

  hashCode in class Object

  Returns:

  the hash code value for this UID

  See Also:

  Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

• equals

  public boolean equals(Object obj)

  Compares the specified object with this UID for equality. This method returns true if and only if the specified object is a UID instance with the same unique, time, and count values as this one.

  Overrides:

  equals in class Object

  Parameters:

  obj - the object to compare this UID to

  Returns:

  true if the given object is equivalent to this one, and false otherwise

  See Also:

  Object.hashCode(), HashMap

• toString

  public String toString()

  Returns a string representation of this UID.

  Overrides:

  toString in class Object

  Returns:

  a string representation of this UID

• write

  public void write(DataOutput out)
             throws IOException

  Marshals a binary representation of this UID to a DataOutput instance.

  Specifically, this method first invokes the given stream's DataOutput.writeInt(int) method with this UID's unique value, then it invokes the stream's DataOutput.writeLong(long) method with this UID's time value, and then it invokes the stream's DataOutput.writeShort(int) method with this UID's count value.

  Parameters:

  out - the DataOutput instance to write this UID to

  Throws:

  IOException - if an I/O error occurs while performing this operation

• read

  public static UID read(DataInput in)
                  throws IOException

  Constructs and returns a new UID instance by unmarshalling a binary representation from an DataInput instance.

  Specifically, this method first invokes the given stream's DataInput.readInt() method to read a unique value, then it invoke's the stream's DataInput.readLong() method to read a time value, then it invoke's the stream's DataInput.readShort() method to read a count value, and then it creates and returns a new UID instance that contains the unique, time, and count values that were read from the stream.

  Parameters:

  in - the DataInput instance to read UID from

  Returns:

  unmarshalled UID instance

  Throws:

  IOException - if an I/O error occurs while performing this operation