Well I really don't know how old or new this terminology is. I came across this when one of my faculty asked me about it but I unable to answer it. So just like other curious and lazy students, I googled the term to to get  a small  knowledge about it.

Today I'm going to share with the same knowledge I captured from some scratch resources.

Java ring is a finger that contains a small microprocessor with built in capabilities for the user.
java ring s a sort of smart card which can be put on a finger. It is a stainless steel ring with 16 millimeters (0.6 inch) of diameter.

 It contains an inexpensive microprocessor in a stainless steel iBUTTON which runs JVM and preloaded applet within it. Java ring in an extremely secure java powered electronic token. It has number of real world applications. It contains a tiny Java Virtual Machine. It implements the JAVA card 2.0 API. Stores information in NVRAM, ROM. It runs applets.
It includes microprocessor, clock, memory and battery.

JAVA ring components include

  • JAVA virtual machine(JVM)
  • RAM
  • ROM
  • real time clock
  • Blue dot receptor
The Java Virtual machine (JVM) is the virtual machine that run the Java bytecodes. 

JAVA ring contains a 134kb nonvolatile RAM. This nonvolatile RAM provides high speed for read/write operations. It also provides zeroization.
JAVA ring contains 32kb of ROM. "e-commerce " operating system is installed in this ROM.

It gives exact time of the day and can run upto 10 years continuously. It is driven by 32Khz crystal oscillator. The frequency of processor clock varies from 10-20 Mhz. This prohibits the hackers from obtaining information from iBUTTON.

It is a computer chip enclosed in a thick stainless steel can. It is also called "touch memory device". JAVA ring uses 1-wire protocol to communicate between host and iBUTTON.
It is similar to a disk shaped battery.Each iBUTTON has a unique and unalterable address laser attached onto its inside the can lid. The address can be used for identification.

Blue Dot Receptor
These are iBUTTON readers that provide a convenient pipeline into the PC for iBUTTON to PC communication. The receptor's cable connects a USB, serial or parallel port 1-wire adapter. 

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