J/K: Just Kidding (הודעות)
J2EE: Java 2 platform, Enterprise Edition (תוכנה) (Sun)
J2ME: Java 2 platform, Micro Edition (תוכנה) (Sun)
J2SE: Java 2 platform, Standard Edition (תוכנה) (Sun)
JA: Jump Address
JA: Jump if Above
JAAS: Java Authentication and Authorization Service (תוכנה) (Sun)
JAD: Joint Application Development
JADE: Jasmine Application Development Environment (מסדי נתונים) (CAI)
JAE: Java Applet Environment (תוכנה) (Sun)
JAE: Jump if Above or Equal
JAF: Javabeans Activation Framework (Sun)
JANET: Joint Academic NETwork
JAR: Java ARchive
JAWS: Jamming And Warning System (חומרה)
JAXM: Java Api for Xml Messaging (תוכנה) (Sun)
JAXP: Java Api for Xml Processing
JBCL: Java Beans Component Library (תוכנה)
JBE: Jump if Below or Equal
JBOD: Just a Bunch Of Disks (חומרה)
JBPC: Java-Based Pipeline Configurator
JC: Jump if Carry set
JCE: Java Cryptography Extension (תוכנה) (Sun)
JCK: Java Compatibility Kit (תוכנה) (Sun)
JCL: Job Control Language (תוכנה)
JCP: Java Community Process
JDBC: Java DataBase Connectivity (מסדי נתונים)
JDC: Java Developer Connection (Sun)
JDE: Java Development Environment
JDI: Java Debug Interface (תוכנה) (Sun)
JDJ: Java Developer's Journal
JDK: Java Development Kit (תוכנה) (Sun)
JDOM: Java Document Object Model
JDT: Java Development Tools
JDWP: Java Debug Wire Protocol (Sun)
JE: Jump if Equal
JEDEC: Joint Electronic Devices Engineering Council
JEIDA: Japanese Electronics Industry Development Association
JEITA: Japanese Electronics and Information Technology industries Association (ארגונים)
JEPI: Joint Electronic Payment Initiative
JES: Job Entry System
JET: Joint Engine Technology (מסדי נתונים) (מיקרוסופט)
JET: Jpeg Enhancement Technology
JFC: Java Foundation Classes (תוכנה)
JFET: Junction Field Effect Transistor
JFIF: Jpeg File Interchange Format
JFS: Journalized File System (מערכות הפעלה)
JG: Jump if Greater
JGE: Jump if Greater or Equal
JGF: Java Graphics Format
JIMI: Java Image Management Interface (Sun)
JIPS: Janet Internet Protocol Service
JIS: Japan Industrial Standard
JISC: Japanese Industrial Standards Committee
JIT: Just In Time
JITA: Just In Time Activation
JITC: Just In Time Compiler
JL: Jump if Less
JLE: Japanese Language Environment
JLE: Jump if Less than or Equal to
JLIP: Joint Level Interface Protocol
JLS: Java Language Specification (Sun)
JMAPI: Java Management Application Programming Interface (Sun)
JMF: Java Media Framework (תוכנה) (Sun)
JMP: JuMP
JMS: Java Message Service
JMSC: Japanese Midi Standard Committee
JMX: Java Management eXtension (Sun)
JNA: Jump if Not Above
JNAE: Jump if Not Above or Equal
JNB: Jump if Not Below
JNBE: Jump if Not Below or Equal
JNDI: Java Naming and Directory Interface (Sun)
JNG: Jump if Not Greater
JNGE: Jump if Not Greater or Equal
JNI: Java Native Interface (Sun)
JNLE: Jump if Not Less or Equal
JNLP: Java Network Launching Protocol (Sun)
JNO: Jump if No Overflow
JNP: Jump if No Parity
JNS: Jump if No Sign
JNZ: Jump if Not Zero
JOE: Java Objects Everywhere
JOHNNIAC: JOHn Neumann Integrator and Automatic Computer
JOOP: Journal of Object Orientated Programming
JOSS: Johnniac Open Shop System
JOSS: Joint Object Services Submission
JOVE: Jonathan's Own Version of Emacs
JOVIAL: Jules Own Version of the International Algorithmic Language
JPDA: Java Platform Debugger Architecture
JPE: Jump if Parity Even
JPEG: Joint Photographic Experts Group
JPG: JPeG (סיומת קובץ)
JPL: Jet Propulsion Laboratory
JPLDIS: Jet Propulsion Laboratory Display Information System
JPNF: Join-Projection Normal Form
JPO: Jump if Parity Odd
JRB: Java Relational Binding (תוכנה)
JRE: Java Runtime Environment (תוכנה)
JRI: Java Runtime Interface
JRMP: Java Remote Method Protocol (תוכנה)
JRP: Joint Requirement Planning
JS: JavaScript (תוכנה) (Netscape)
JS: Jump if Sign
JSA: Japanese Standards Association
JSC: Java Swing Connection (Sun)
JSCP: Java Software CoProcessor
JSDK: Java Servlet Development Kit (תוכנה)
JSDT: Java Shared Data Toolkit
JSGF: JSpeech Grammar Format
JSML: JSpeech Markup Language
JSP: Java Service Pages (תוכנה)
JSR: Java Specification Request (Sun)
JSS: Javascript Style Sheet
JSSE: Java Secure Socket Extension (תוכנה) (Sun)
JST: Japan Standard Time
JSWDK: JavaServer Web Development Kit (תוכנה) (Sun)
JTA: Java Transaction Api (Sun)
JTAPI: Java Telephony Application Programming Interface (Sun)
JTB: Jump Trace Buffer
JTC: Joint Technical Committee
JTM: Job Transfer and Manipulation
JTMS: Justification based Truth Maintenance System
JTS: Java Transaction Service
JTSIN: Joint Transmission Services Information Network
JUG: Java User Group
JUGHEAD: Jonzy's Universal Gopher Hierarchy
Excavation And Display
JUMP: Java User Migration Path (תוכנה) (מיקרוסופט)
JUNET: Japan Unix NETwork
JVM: Java Virtual Machine
JVMDI: Java Virtual Machine Debug Interface (Sun)
JVMPI: Java Virtual Machine Profiler Interface
JVS: Java Validation Suite (תוכנה)
JWS: Java Web Server (Sun)
JXTA: JuXTApose
JZ: Jump if Zero
