Joshua Bloch


Joshua J. Bloch
Bloch in 2008
Born (1961-08-28) August 28, 1961 (age 60)
Alma materColumbia University (B.S.)
Carnegie Mellon University (Ph.D.)
Scientific career
InstitutionsCarnegie Mellon University
Doctoral advisorAlfred Spector

Joshua J. Bloch (born August 28, 1961) is an American software engineer and a technology author, formerly employed at Sun Microsystems and Google. He led the design and implementation of numerous Java platform features, including the Java Collections Framework, the java.math package, and the assert mechanism.[1] He is the author of the programming guide Effective Java (2001), which won the 2001 Jolt Award,[2] and is a co-author of two other Java books, Java Puzzlers (2005) and Java Concurrency In Practice (2006).

Bloch holds a B.S. in computer science from Columbia University and a Ph.D. in computer science from Carnegie Mellon University.[1] His 1990 thesis was titled A Practical Approach to Replication of Abstract Data Objects[3] and was nominated for the ACM Distinguished Doctoral Dissertation Award.[4]

Bloch has worked as a Senior Systems Designer at Transarc, and later as a Distinguished Engineer at Sun Microsystems. In June 2004, he left Sun and became Chief Java Architect at Google.[5] On August 3, 2012, Bloch announced that he would be leaving Google.[6]

In December 2004, Java Developer's Journal included Bloch in its list of the "Top 40 Software People in the World".[7]

Bloch has proposed the extension of the Java programming language with two features: Concise Instance Creation Expressions (CICE) (coproposed with Bob Lee and Doug Lea) and Automatic Resource Management (ARM) blocks. The combination of CICE and ARM formed one of the three early proposals for adding support for closures to Java.[8] ARM blocks were added to the language in JDK7.[9]

Bloch is currently an affiliated faculty member of the Institute for Software Research at Carnegie Mellon University, where he holds the title "Adjunct Professor of the Practice".[10]


  • Effective Java: Programming Language Guide, ISBN 0-201-31005-8, 2001; second edition: ISBN 978-0-321-35668-0, 2008; third edition: ISBN 978-0134685991, 2017
  • Java Puzzlers: Traps, Pitfalls, and Corner Cases, ISBN 0-321-33678-X, 2005 (co-authored with Neal Gafter)
  • Java Concurrency in Practice, ISBN 0-321-34960-1, 2006 (co-authored with Brian Goetz, Tim Peierls, Joseph Bowbeer, David Holmes, and Doug Lea)
  • Joshua Bloch (2006). "How to design a good API and why it matters". Companion to the 21st ACM SIGPLAN conference on Object-oriented programming systems, languages, and applications - OOPSLA '06. doi:10.1145/1176617.1176622. Wikidata Q56602059.


  1. ^ a b "About the Author", Effective Java Programming Language Guide
  2. ^ 2002 Jolt & Productivity Award Winners Archived 2007-05-03 at the Wayback Machine. Dr. Dobb's Portal.
  3. ^ A Practical Approach to Replication of Abstract Data Objects. Computer Science Department, School of Computer Science, Carnegie Mellon University. May 1990.
  4. ^ Books & Authors: Effective Java, accessed 16 April 2008
  5. ^ Heiss, Janet J. (2007). "Rock Star Josh Bloch". JavaOne. Archived from the original on 27 October 2007.
  6. ^ Joshua Bloch, After eight years at Google, the time has come for me to move on
  7. ^ Geelan, Jeremy (2004-12-21). "The i-Technology Right Stuff". Java Developer's Journal.
  8. ^ Kreft, Klaus; Langer, Angelika (17 June 2008). "Understanding the closures debate". JavaWorld. Retrieved 2020-07-20.
  9. ^ Darcy, Joseph D. (28 August 2009). "Project Coin: The Final Five (Or So)". Joseph D. Darcy's Oracle Weblog. Oracle. Retrieved 6 May 2014.
  10. ^ "Faculty". Institute for Software Research. Carnegie Mellon University. Retrieved 31 August 2020.

External links

  • Bloch, Joshua (January 4, 2002). "Joshua Bloch: A conversation about design". JavaWorld. Interviewed by Venners, Bill. Retrieved 2020-07-20.
  • Janice J. Heiss, More Effective Java With Google's Joshua Bloch October, 2008
  • Josh Bloch, How to design a good API and why it matters, Google Tech Talk, 2007