DOCSLIB.ORG

GNU Classpath and Java 1.5 2 GNU Classpath the Generics Branch Virtual Machines and Compilers the Future

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
GNU Classpath and Java 1.5 2 GNU Classpath the Generics Branch Virtual Machines and Compilers the Future Java 1.5 GNU Classpath Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 2 GNU Classpath The Generics Branch Virtual Machines and Compilers The Future Java 1.5 GNU Classpath Outline 1 Java 1.5 Generics Enumerations Annotations Other Additions Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Java 1.5 GNU Classpath Outline 1 Java 1.5 Generics Enumerations Annotations Other Additions 2 GNU Classpath The Generics Branch Virtual Machines and Compilers The Future Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Outline 1 Java 1.5 Generics Enumerations Annotations Other Additions 2 GNU Classpath The Generics Branch Virtual Machines and Compilers The Future Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Generics Annotations Enumerations Three major changes: Plus lots of syntactic sugar Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Java 1.5 ‘the largest set of changes in the language’s history’ 1 1Preface to the Third Edition of the Java Language Specification Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Generics Annotations Enumerations Plus lots of syntactic sugar Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Java 1.5 ‘the largest set of changes in the language’s history’ 1 Three major changes: 1Preface to the Third Edition of the Java Language Specification Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Annotations Enumerations Plus lots of syntactic sugar Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Java 1.5 ‘the largest set of changes in the language’s history’ 1 Three major changes: Generics 1Preface to the Third Edition of the Java Language Specification Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Enumerations Plus lots of syntactic sugar Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Java 1.5 ‘the largest set of changes in the language’s history’ 1 Three major changes: Generics Annotations 1Preface to the Third Edition of the Java Language Specification Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Plus lots of syntactic sugar Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Java 1.5 ‘the largest set of changes in the language’s history’ 1 Three major changes: Generics Annotations Enumerations 1Preface to the Third Edition of the Java Language Specification Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Java 1.5 ‘the largest set of changes in the language’s history’ 1 Three major changes: Generics Annotations Enumerations Plus lots of syntactic sugar 1Preface to the Third Edition of the Java Language Specification Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Normal instance variables with values Type variables instantiated with a particular type. An instance of a generic class contains both: Thus, a class can be defined that generalizes over certain types. Derives from work on GJ by (Bracha, Odersky, Stoutamire and Wadler, 1998) – see the proceedings of OOPSLA in ACM SIGPLAN Notices 33 (10) pages 183–200. Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Type Variables The term ’generics’ basically refers to the introduction of type variables. Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Normal instance variables with values Type variables instantiated with a particular type. Thus, a class can be defined that generalizes over certain types. Derives from work on GJ by (Bracha, Odersky, Stoutamire and Wadler, 1998) – see the proceedings of OOPSLA in ACM SIGPLAN Notices 33 (10) pages 183–200. Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Type Variables The term ’generics’ basically refers to the introduction of type variables. An instance of a generic class contains both: Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Type variables instantiated with a particular type. Thus, a class can be defined that generalizes over certain types. Derives from work on GJ by (Bracha, Odersky, Stoutamire and Wadler, 1998) – see the proceedings of OOPSLA in ACM SIGPLAN Notices 33 (10) pages 183–200. Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Type Variables The term ’generics’ basically refers to the introduction of type variables. An instance of a generic class contains both: Normal instance variables with values Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Thus, a class can be defined that generalizes over certain types. Derives from work on GJ by (Bracha, Odersky, Stoutamire and Wadler, 1998) – see the proceedings of OOPSLA in ACM SIGPLAN Notices 33 (10) pages 183–200. Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Type Variables The term ’generics’ basically refers to the introduction of type variables. An instance of a generic class contains both: Normal instance variables with values Type variables instantiated with a particular type. Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Derives from work on GJ by (Bracha, Odersky, Stoutamire and Wadler, 1998) – see the proceedings of OOPSLA in ACM SIGPLAN Notices 33 (10) pages 183–200. Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Type Variables The term ’generics’ basically refers to the introduction of type variables. An instance of a generic class contains both: Normal instance variables with values Type variables instantiated with a particular type. Thus, a class can be defined that generalizes over certain types. Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Type Variables The term ’generics’ basically refers to the introduction of type variables. An instance of a generic class contains both: Normal instance variables with values Type variables instantiated with a particular type. Thus, a class can be defined that generalizes over certain types. Derives from work on GJ by (Bracha, Odersky, Stoutamire and Wadler, 1998) – see the proceedings of OOPSLA in ACM SIGPLAN Notices 33 (10) pages 183–200. Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Classes and Interfaces Constructors and Methods Variables which use a generic class as their type are referred to as parameterized types. That is, the exact type used is determined by the parameters used to instantiate the type variables. Example List<String> names; Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Parameterized Types Type variables can be associated with: Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Constructors and Methods Variables which use a generic class as their type are referred to as parameterized types. That is, the exact type used is determined by the parameters used to instantiate the type variables. Example List<String> names; Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Parameterized Types Type variables can be associated with: Classes and Interfaces Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Variables which use a generic class as their type are referred to as parameterized types. That is, the exact type used is determined by the parameters used to instantiate the type variables. Example List<String> names; Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Parameterized Types Type variables can be associated with: Classes and Interfaces Constructors and Methods Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 That is, the exact type used is determined by the parameters used to instantiate the type variables. Example List<String> names; Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Parameterized Types Type variables can be associated with: Classes and Interfaces Constructors and Methods Variables which use a generic class as their type are referred to as parameterized types. Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Example List<String> names; Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Parameterized Types Type variables can be associated with: Classes and Interfaces Constructors and Methods Variables which use a generic class as their type are referred to as parameterized types. That is, the exact type used is determined by the parameters used to instantiate the type variables. Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions Parameterized Types Type variables can be associated with: Classes and Interfaces Constructors and Methods Variables which use a generic class as their type are referred to as parameterized types. That is, the exact type used is determined by the parameters used to instantiate the type variables. Example List<String> names; Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 When defining a collection of things, we want to say what type of thing we want to put in the collection. Prior to Java 1.5, we can’t Instead, we just call everything in the collection an instance of the common supertype, Object Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions How Is This Useful? Collections benefit most obviously from type variables. Andrew Hughes http://planet.classpath.org GNU Classpath and Java 1.5 Prior to Java 1.5, we can’t Instead, we just call everything in the collection an instance of the common supertype, Object Generics Java 1.5 Enumerations GNU Classpath Annotations Other Additions How Is This Useful? Collections benefit most obviously from type variables. When defining a collection of things, we want to say what type of thing we want to put in the collection.
Load more

Recommended publications
  • Toward Harnessing High-Level Language Virtual Machines for Further Speeding up Weak Mutation Testing
    2012 IEEE Fifth International Conference on Software Testing, Verification and Validation Toward Harnessing High-level Language Virtual Machines for Further Speeding up Weak Mutation Testing Vinicius H. S. Durelli Jeff Offutt Marcio E. Delamaro Computer Systems Department Software Engineering Computer Systems Department Universidade de Sao˜ Paulo George Mason University Universidade de Sao˜ Paulo Sao˜ Carlos, SP, Brazil Fairfax, VA, USA Sao˜ Carlos, SP, Brazil [email protected] [email protected] [email protected] Abstract—High-level language virtual machines (HLL VMs) have tried to exploit the control that HLL VMs exert over run- are now widely used to implement high-level programming ning programs to facilitate and speedup software engineering languages. To a certain extent, their widespread adoption is due activities. Thus, this research suggests that software testing to the software engineering benefits provided by these managed execution environments, for example, garbage collection (GC) activities can benefit from HLL VMs support. and cross-platform portability. Although HLL VMs are widely Test tools are usually built on top of HLL VMs. However, used, most research has concentrated on high-end optimizations they often end up tampering with the emergent computation. such as dynamic compilation and advanced GC techniques. Few Using features within the HLL VMs can avoid such problems. efforts have focused on introducing features that automate or fa- Moreover, embedding testing tools within HLL VMs can cilitate certain software engineering activities, including software testing. This paper suggests that HLL VMs provide a reasonable significantly speedup computationally expensive techniques basis for building an integrated software testing environment. As such as mutation testing [6].
    [Show full text]
  • A Hardware Abstraction Layer in Java
    A Hardware Abstraction Layer in Java MARTIN SCHOEBERL Vienna University of Technology, Austria STEPHAN KORSHOLM Aalborg University, Denmark TOMAS KALIBERA Purdue University, USA and ANDERS P. RAVN Aalborg University, Denmark Embedded systems use specialized hardware devices to interact with their environment, and since they have to be dependable, it is attractive to use a modern, type-safe programming language like Java to develop programs for them. Standard Java, as a platform independent language, delegates access to devices, direct memory access, and interrupt handling to some underlying operating system or kernel, but in the embedded systems domain resources are scarce and a Java virtual machine (JVM) without an underlying middleware is an attractive architecture. The contribution of this paper is a proposal for Java packages with hardware objects and interrupt handlers that interface to such a JVM. We provide implementations of the proposal directly in hardware, as extensions of standard interpreters, and finally with an operating system middleware. The latter solution is mainly seen as a migration path allowing Java programs to coexist with legacy system components. An important aspect of the proposal is that it is compatible with the Real-Time Specification for Java (RTSJ). Categories and Subject Descriptors: D.4.7 [Operating Systems]: Organization and Design—Real-time sys- tems and embedded systems; D.3.3 [Programming Languages]: Language Classifications—Object-oriented languages; D.3.3 [Programming Languages]: Language Constructs and Features—Input/output General Terms: Languages, Design, Implementation Additional Key Words and Phrases: Device driver, embedded system, Java, Java virtual machine 1. INTRODUCTION When developing software for an embedded system, for instance an instrument, it is nec- essary to control specialized hardware devices, for instance a heating element or an inter- ferometer mirror.
    [Show full text]
  • Techniques for Real-System Characterization of Java Virtual Machine Energy and Power Behavior Gilberto Contreras Margaret Martonosi
    Techniques for Real-System Characterization of Java Virtual Machine Energy and Power Behavior Gilberto Contreras Margaret Martonosi Department of Electrical Engineering Princeton University 1 Why Study Power in Java Systems? The Java platform has been adopted in a wide variety of devices Java servers demand performance, embedded devices require low-power Performance is important, power/energy/thermal issues are equally important How do we study and characterize these requirements in a multi-layer platform? 2 Power/Performance Design Issues Java Application Java Virtual Machine Operating System Hardware 3 Power/Performance Design Issues Java Application Garbage Class Runtime Execution Collection LoaderJava VirtualCompiler MachineEngine Operating System Hardware How do the various software layers affect power/performance characteristics of hardware? Where should time be invested when designing power and/or thermally aware Java virtual Machines? 4 Outline Approaches for Energy/Performance Characterization of Java virtual machines Methodology Breaking the JVM into sub-components Hardware-based power/performance characterization of JVM sub-components Results Jikes & Kaffe on Pentium M Kaffe on Intel XScale Conclusions 5 Power & Performance Analysis of Java Simulation Approach √ Flexible: easy to model non-existent hardware x Simulators may lack comprehensiveness and accuracy x Thermal studies require tens of seconds granularity Accurate simulators are too slow Hardware Approach √ Able to capture full-system characteristics
    [Show full text]
  • Apache Harmony Project Tim Ellison Geir Magnusson Jr
    The Apache Harmony Project Tim Ellison Geir Magnusson Jr. Apache Harmony Project http://harmony.apache.org TS-7820 2007 JavaOneSM Conference | Session TS-7820 | Goal of This Talk In the next 45 minutes you will... Learn about the motivations, current status, and future plans of the Apache Harmony project 2007 JavaOneSM Conference | Session TS-7820 | 2 Agenda Project History Development Model Modularity VM Interface How Are We Doing? Relevance in the Age of OpenJDK Summary 2007 JavaOneSM Conference | Session TS-7820 | 3 Agenda Project History Development Model Modularity VM Interface How Are We Doing? Relevance in the Age of OpenJDK Summary 2007 JavaOneSM Conference | Session TS-7820 | 4 Apache Harmony In the Beginning May 2005—founded in the Apache Incubator Primary Goals 1. Compatible, independent implementation of Java™ Platform, Standard Edition (Java SE platform) under the Apache License 2. Community-developed, modular architecture allowing sharing and independent innovation 3. Protect IP rights of ecosystem 2007 JavaOneSM Conference | Session TS-7820 | 5 Apache Harmony Early history: 2005 Broad community discussion • Technical issues • Legal and IP issues • Project governance issues Goal: Consolidation and Consensus 2007 JavaOneSM Conference | Session TS-7820 | 6 Early History Early history: 2005/2006 Initial Code Contributions • Three Virtual machines ● JCHEVM, BootVM, DRLVM • Class Libraries ● Core classes, VM interface, test cases ● Security, beans, regex, Swing, AWT ● RMI and math 2007 JavaOneSM Conference | Session TS-7820 |
    [Show full text]
  • A Post-Apocalyptic Sun.Misc.Unsafe World
    A Post-Apocalyptic sun.misc.Unsafe World http://www.superbwallpapers.com/fantasy/post-apocalyptic-tower-bridge-london-26546/ Chris Engelbert Twitter: @noctarius2k Jatumba! 2014, 2015, 2016, … Disclaimer This talk is not going to be negative! Disclaimer But certain things are highly speculative and APIs or ideas might change by tomorrow! sun.misc.Scissors http://www.underwhelmedcomic.com/wp-content/uploads/2012/03/runningdude.jpg sun.misc.Unsafe - What you (don’t) know sun.misc.Unsafe - What you (don’t) know • Internal class (sun.misc Package) sun.misc.Unsafe - What you (don’t) know • Internal class (sun.misc Package) sun.misc.Unsafe - What you (don’t) know • Internal class (sun.misc Package) • Used inside the JVM / JRE sun.misc.Unsafe - What you (don’t) know • Internal class (sun.misc Package) • Used inside the JVM / JRE // Unsafe mechanics private static final sun.misc.Unsafe U; private static final long QBASE; private static final long QLOCK; private static final int ABASE; private static final int ASHIFT; static { try { U = sun.misc.Unsafe.getUnsafe(); Class<?> k = WorkQueue.class; Class<?> ak = ForkJoinTask[].class; example: QBASE = U.objectFieldOffset (k.getDeclaredField("base")); java.util.concurrent.ForkJoinPool QLOCK = U.objectFieldOffset (k.getDeclaredField("qlock")); ABASE = U.arrayBaseOffset(ak); int scale = U.arrayIndexScale(ak); if ((scale & (scale - 1)) != 0) throw new Error("data type scale not a power of two"); ASHIFT = 31 - Integer.numberOfLeadingZeros(scale); } catch (Exception e) { throw new Error(e); } } } sun.misc.Unsafe
    [Show full text]
  • Openjdk – the Future of Open Source Java on GNU/Linux
    OpenJDK – The Future of Open Source Java on GNU/Linux Dalibor Topić Java F/OSS Ambassador Blog aggregated on http://planetjdk.org Java Implementations Become Open Source Java ME, Java SE, and Java EE 2 Why now? Maturity Java is everywhere Adoption F/OSS growing globally Innovation Faster progress through participation 3 Why GNU/Linux? Values Freedom as a core value Stack Free Software above and below the JVM Demand Increasing demand for Java integration 4 Who profits? Developers New markets, new possibilities Customers More innovations, reduced risk Sun Mindshare, anchoring Java in GNU/Linux 5 License + Classpath GPL v2 Exception • No proprietary forks (for SE, EE) • Popular & trusted • Programs can have license any license • Compatible with • Improvements GNU/Linux remain in the community • Fostering adoption • FSFs license for GNU Classpath 6 A Little Bit Of History Jun 1996: Work on gcj starts Nov 1996: Work on Kaffe starts Feb 1998: First GNU Classpath Release Mar 2000: GNU Classpath and libgcj merge Dec 2002: Eclipse runs on gcj/Classpath Oct 2003: Kaffe switches to GNU Classpath Feb 2004: First FOSDEM Java Libre track Apr 2004: Richard Stallman on the 'Java Trap' Jan 2005: OpenOffice.org runs on gcj Mai 2005: Work on Harmony starts 7 Sun & Open Source Java RIs Juni 2005: Java EE RI Glassfish goes Open Source Mai 2006: First Glassfish release Mai 2006: Java announced to go Open Source November 2006: Java ME RI PhoneME goes Open Source November 2006: Java SE RI Hotspot und Javac go Open Source Mai 2007: The rest of Java SE follows suit 8 Status: JavaOne, Mai 2007 OpenJDK can be fully built from source, 'mostly' Open Source 25,169 Source code files 894 (4%) Binary files (“plugs”) 1,885 (8%) Open Source, though not GPLv2 The rest is GPLv2 (+ CP exception) Sun couldn't release the 4% back then as free software.
    [Show full text]
  • Free Java Developer Room
    Room: AW1.121 Free Java Developer Room Saturday 2008-02-23 14:00-15:00 Welcome to the Free Java Meeting Welcome and introduction to the projects, people and themes that make Rich Sands – Mark Reinhold – Mark up the Free Java Meeting at Fosdem. ~ GNU Classpath ~ OpenJDK Wielaard – Tom Marble 15:00-16:00 Mobile Java Take your freedom to the max! Make your Free Java mobile. Christian Thalinger - Guillaume ~ CACAO Embedded ~ PhoneME ~ Midpath Legris - Ray Gans 16:00-16:40 Women in Java Technology Female programmers are rare. Female Java programmers are even more Clara Ko - Linda van der Pal rare. ~ Duchess, Ladies in Java Break 17:00-17:30 Hacking OpenJDK & Friends Hear about directions in hacking Free Java from the front lines. Roman Kennke - Andrew Hughes ~ OpenJDK ~ BrandWeg ~ IcePick 17:30-19:00 VM Rumble, Porting and Architectures Dalibor Topic - Robert Lougher - There are lots of runtimes able to execute your java byte code. But which Peter Kessler - Ian Rogers - one is the best, coolest, smartest, easiest portable or just simply the most fun? ~ Kaffe ~ JamVM ~ HotSpot ~ JikesRVM ~ CACAO ~ ikvm ~ Zero- Christian Thalinger - Jeroen Frijters assembler Port ~ Mika - Gary Benson - Chris Gray Sunday 2008-02-24 9:00-10:00 Distro Rumble So which GNU/Linux distribution integrates java packages best? Find out Petteri Raty - Tom Fitzsimmons - during this distro shootout! ~ Gentoo ~ Fedora ~ Debian ~ Ubuntu Matthias Klose 10:00-11:30 The Free Java Factory OpenJDK and IcedTea, how are they made and how do you test them? David Herron - Lillian Angel - Tom ~ OpenJDK ~ IcedTea Fitzsimmons 11:30-13:00 JIT Session: Discussion Topics Dynamically Loaded Want to hear about -- or talk about -- something the Free Java world and don't see a topic on the agenda? This time is reserved for late binding Tom Marble discussion.
    [Show full text]
  • Eclipse (Software) 1 Eclipse (Software)
    Eclipse (software) 1 Eclipse (software) Eclipse Screenshot of Eclipse 3.6 Developer(s) Free and open source software community Stable release 3.6.2 Helios / 25 February 2011 Preview release 3.7M6 / 10 March 2011 Development status Active Written in Java Operating system Cross-platform: Linux, Mac OS X, Solaris, Windows Platform Java SE, Standard Widget Toolkit Available in Multilingual Type Software development License Eclipse Public License Website [1] Eclipse is a multi-language software development environment comprising an integrated development environment (IDE) and an extensible plug-in system. It is written mostly in Java and can be used to develop applications in Java and, by means of various plug-ins, other programming languages including Ada, C, C++, COBOL, Perl, PHP, Python, Ruby (including Ruby on Rails framework), Scala, Clojure, and Scheme. The IDE is often called Eclipse ADT for Ada, Eclipse CDT for C/C++, Eclipse JDT for Java, and Eclipse PDT for PHP. The initial codebase originated from VisualAge.[2] In its default form it is meant for Java developers, consisting of the Java Development Tools (JDT). Users can extend its abilities by installing plug-ins written for the Eclipse software framework, such as development toolkits for other programming languages, and can write and contribute their own plug-in modules. Released under the terms of the Eclipse Public License, Eclipse is free and open source software. It was one of the first IDEs to run under GNU Classpath and it runs without issues under IcedTea. Eclipse (software) 2 Architecture Eclipse employs plug-ins in order to provide all of its functionality on top of (and including) the runtime system, in contrast to some other applications where functionality is typically hard coded.
    [Show full text]
  • Fedora Core, Java™ and You
    Fedora Core, Java™ and You Gary Benson Software Engineer What is Java? The word ªJavaº is used to describe three things: The Java programming language The Java virtual machine The Java platform To support Java applications Fedora needs all three. What Fedora uses: GCJ and ECJ GCJ is the core of Fedora©s Java support: GCJ includes gcj, a compiler for the Java programming language. GCJ also has a runtime and class library, collectively called libgcj. The class library is separately known as GNU Classpath. ECJ is the Eclipse Compiler for Java: GCJ©s compiler gcj is not used for ªtraditionalº Java compilation. More on that later... Why libgcj? There are many free Java Virtual machines: Cacao, IKVM, JamVM, Jikes RVM, Kaffe, libgcj, Sable VM, ... There are two main reasons Fedora uses libgcj: Availability on many platforms. Ability to use precompiled native code. GNU Classpath Free core class library for Java virtual machines and compilers. The JPackage Project A collection of some 1,600 Java software packages for Linux: Distribution-agnostic RPM packages. Both runtimes/development kits and applications. Segregation between free and non-free packages. All free packages built entirely from source. Multiple runtimes/development kits may be installed. Fedora includes: JPackage-compatible runtime and development kit packages. A whole bunch of applications. JPackage JOnAS Fedora©s Java Compilers gcj can operate in several modes: Java source (.java) to Java bytecode (.class) Java source (.java) to native machine code (.o) Java bytecode (.class, .jar) to native machine code (.o) In Fedora: ECJ compiles Java source to bytecode. gcj compiles that bytecode to native machine code.
    [Show full text]
  • Artisynth Installation Guide for Macos
    ArtiSynth Installation Guide for MacOS John Lloyd, Sebastian Kazenbroot-Guppy, and Antonio Sánchez Last updated: March, 2018 ArtiSynth Installation Guide for MacOS 2 Contents 1 Introduction 4 2 Prerequisites 4 3 Downloading a Prepacked Release 5 3.1 Downloadingandunpackingthezipfile . ................... 5 4 Cloning from Github 5 4.0.1 Cloningusingthecommandline . ............... 5 4.0.2 CloningusingEclipse . ............. 5 4.1 Downloadingthelibraries. .................. 5 5 Building ArtiSynth 6 5.1 BuildingwithEclipse. .... .... .... ... .... .... .... ................ 6 5.2 Buildingfromthecommandline . ................. 6 6 Running ArtiSynth 6 6.1 Runningfromthecommandline . ................ 6 6.2 Runningfromthefilebrowser . ................ 6 6.3 Commandlinearguments. ............... 7 6.4 RunningusingEclipse .... .... .... ... .... .... .... .. ............... 7 6.5 LoadingandRunningModels . ............... 7 7 Installing External Models and Packages 7 7.1 Downloading ..................................... ............ 8 7.2 Building........................................ ............ 8 7.2.1 BuildingwithEclipse. .............. 8 7.2.2 Buildingfromthecommandline. ............... 8 7.3 Running......................................... ........... 8 7.3.1 Adding external classes using the Eclipse Classpath . ........................ 8 7.3.2 AddingexternalclassesusingEXTCLASSPATH . .................. 8 7.3.3 AddingexternalclassesusingCLASSPATH . .................. 8 8 Updating ArtiSynth 9 8.1 Libraryupdates .................................
    [Show full text]
  • Chapter 9: Java
    ,ch09.6595 Page 159 Friday, March 25, 2005 2:47 PM Chapter 9 CHAPTER 9 Java Many Java developers like Integrated Development Environments (IDEs) such as Eclipse. Given such well-known alternatives as Java IDEs and Ant, readers could well ask why they should even think of using make on Java projects. This chapter explores the value of make in these situations; in particular, it presents a generalized makefile that can be dropped into just about any Java project with minimal modification and carry out all the standard rebuilding tasks. Using make with Java raises several issues and introduces some opportunities. This is primarily due to three factors: the Java compiler, javac, is extremely fast; the stan- dard Java compiler supports the @filename syntax for reading “command-line param- eters” from a file; and if a Java package is specified, the Java language specifies a path to the .class file. Standard Java compilers are very fast. This is primarily due to the way the import directive works. Similar to a #include in C, this directive is used to allow access to externally defined symbols. However, rather than rereading source code, which then needs to be reparsed and analyzed, Java reads the class files directly. Because the symbols in a class file cannot change during the compilation process, the class files are cached by the compiler. In even medium-sized projects, this means the Java com- piler can avoid rereading, parsing, and analyzing literally millions of lines of code compared with C. A more modest performance improvement is due to the bare mini- mum of optimization performed by most Java compilers.
    [Show full text]
  • Migration-Guide.Pdf
    Java Platform, Standard Edition Oracle JDK Migration Guide Release 15 F30923-01 September 2020 Getting Started The purpose of this guide is to help you identify potential issues and give you suggestions on how to proceed as you migrate your existing Java application to JDK 15. The guide also highlights the significant changes and enhancements done in JDK 15. This guide contains the following sections: • Significant Changes in the JDK • Preparing For Migration • Migrating From JDK 8 to Later JDK Releases • Next Steps Note: • Check the Oracle JDK Certified System Configurations for the latest supported platforms and operating system versions. • See Removed APIs, Tools, and Components before you start the migration process. Significant Changes in the JDK Before migrating your application to the latest JDK release, you must understand what the updates and changes are between it and the previous JDK release. If you are migrating from JDK 8, you should also be familiar with the differences between JDK 8 and later releases that are described in Migrating From JDK 8 to Later JDK Releases. See the following sections to learn about some of the significant changes in latest JDK releases. 1 Significant Changes in JDK 15 Release See JDK 15 Release Notes for the complete list of new features and enhancements in JDK 15. The following are some of the updates in Java SE 15 and JDK 15: • Text Blocks, first previewed in Java SE 13, is a permanent feature in this release and can be used without enabling preview features. Text blocks are multiline string literals that avoid the need for most escape sequences, automatically format the string in a predictable way, and give the developer control over the format when desired.
    [Show full text]