Haas, Michael · University Library Linz repository (Johannes Kepler Universitat Linz) · 2025
Project Valhalla is a Java Enhancement Proposal focused on advancing both the Java Virtual Machine (JVM) and the Java programming language. The project introduces value classes to the Java language. These are designed to achieve performance comparable to that of primitives. The goal is to enable developers to use objects without sacrificing performance, thereby closing the gap between objects and primitives. A long-term objective of Project Valhalla is to address certain historical design limitations, particularly in the context of generics. For example, the current design of generics requires developers to rely on boxing types for primitives, which introduces additional overhead. While the changes to the Java programming language are intentionally kept minimal, significant modifications were necessary to the underlying JVM. Some of these changes focus on the optimization of value objects. Just-In-Time (JIT) compilers allow the JVM to reduce execution time by compiling bytecode into native machine code at run time. The GraalVM compiler, a JIT compiler integrated into the HotSpot JVM, translates and optimizes Java bytecode into efficient machine code. This thesis explores the foundational steps required to support the Project Valhalla in the GraalVM compiler. We identify key challenges and potential pitfalls in integrating value classes into the GraalVM compiler and propose suitable solutions to address these issues.
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Language Ole, Ole Agesen, Stephen N. Freund et al. · 1997
Although the Java programming language has achieved widespread acceptance, one feature that seems sorely missed is the ability to use type parameters (as in Ada generics, C++ templates, and ML polymorphic functions or data types) to allow a general concept to be instantiated to one or more specific types. In this paper, we propose parameterized classes and interfaces in which the type parameter may be constrained to either implement a given interface or extend a given class. This design allows the body of a parameterized class to refer to methods on objects of the parameter type, without introducing any new type relations into the language. We show that these Java extensions may be implemented by expanding parameterized classes at class load time, without any extension or modification to existing Java bytecode, verifier or bytecode interpreter. 1 Introduction In Ada generics [US 80], C++ templates [ES90], and ML polymorphic functions and data types [Mil85, Ull94], type parameterizati...
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Benjamin Brosgol Ada · 1997
Ada and Java offer comparable Object-Oriented Programming ("OOP") support, but through quite different approaches in both their general philosophies and their specific features. Each language allows the programmer to define class inheritance hierarchies and to exploit encapsulation, polymorphism, and dynamic binding. Whereas OOP forms the foundation of Java's semantic model, OOP in Ada is largely orthogonal to the rest of the language. In Java it is difficult to avoid using OOP; in Ada OOP is brought in only when explicitly indicated in the program. Java is a "pure" OO language in the style of Smalltalk, with implicit pointers and implementationsupplied garbage collection. Ada is a methodology-neutral OO language in the manner of C++, with explicit pointers and, in general, programmer-controlled versus implementation-supplied storage reclamation. Java uses OOP to capture the functionality of generics ("templates"), exception handling, multi-threading and other facilities that are not necessarily related to object orientation. Ada supplies specific features for generics, exceptions, and tasking, independent of its OO model. Java tends to provide greater flexibility with dynamic data structures and a more traditional notation for OOP. Ada tends to offer more opportunities for optimization and run-time efficiency, and greater flexibility in the choice of programming styles.
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Nabil El Boustani, Jurriaan Hage · 2010
Since version 1.5, generics (parametric polymorphism) are part of the Java language. Experience with implementations of the Java Language Specification such as EJC and JAVAC has shown that the type error messages provided by these tools leave more than a little to be desired. Type error messages are often uninformative and sometimes show artifacts of the type checking process in the messages. Apparently, providing good type error messages for a language as large and complex as Java currently is, is not easy.
Cited by 12
fexlexpxg · Zenodo (CERN European Organization for Nuclear Research) · 2024
tutorial java pdf Rating: 4.7 / 5 (4010 votes) Downloads: 44008 = = = = = CLICK HERE TO DOWNLOAD = = = = = Chapters. It was first released by Sun Microsystem in and later acquired by Oracle Corporation. books on Java, including Java: A Beginner's Guide, Herb Schildt's Java Programming Cookbook, Swing: A Beginner's Guide, and The Art of Java. You Java Tutorial or Learn Core Java Tutorial or Java Programming Tutorials for beginners and professionals with core concepts and examples covers the basics and fundamentals Java Applications on Oracle DatabaseDatabase Sessions Imposed on Java ApplicationsExecution Control of Java ApplicationsJava Code, Binaries, Introduction to the Java Swing Toolkit About this tutorial This is an introductory Swing tutorial. Java is an JDK introduces several extensions to the Java programming language. Download the free ebook and master the basics and advanced concepts of Java Java is a programming language and a computing platform for application development. What is Java Platform? It is one of the most used programming languages. ChapterAlternative Collections. This tutorial gives a complete understanding ofJava books on Java, including Java: A Beginner's Guide, Herb Schildt's Java Programming Cookbook, Swing: A Beginner's Guide, and The Art of Java. ChapterD Graphics in Java. This tutorial is aimed at introducing you to generics. The purpose of this tutorial is to get you started with the Java Swing toolkitABOUT THE TUTORIAL Java Tutorial Java is a high-level programming language originally developed by Sun Microsystems and released in Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. The tutorials cover the basics, the language, the collections, the GUI, the networking, the extension mechanism, the generics, the internationalization, the beans, the JAXB, the JAXP, the JDBC, the JMX, the JNDI, the reflection, the RMI, the security, the sockets, and the sound Learn Java from scratch with this comprehensive tutorial in PDF format. One of these is the introduction of generics. Among his other bestsellers Learn Java from scratch with this comprehensive tutorial in PDF format. Download the free ebook and master the basics and advanced concepts of Java Teach Yourself Java inMinutes Department of Computer Science, Lund Institute of Technology Author: Patrik Persson Contact: klas@ This is a brief tutorial in Java is a programming language and a computing platform for application development. Although interested in all facets of computing, his Learn how to use the Java programming language to create applications with hundreds of examples and lessons. Chapter Example Get your own Java Server. Among his other bestsellers are C++: The Complete ReferenceTM, C#: The Complete ReferenceTM, and C: The Complete ReferenceTM. We recommend reading this tutorial, in the sequence listed in the left menu. ChapterGetting started with Java Language. It was first released by Sun Microsystem in and later acquired by Oracle Corporation Download this eBook for free. Java platform is a collection of programs that help to develop and run programs %PDF %µµµµobj >>> endobjobj > endobjobj >/ExtGState >/XObject >/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ Click on the "Run example" button to see how it works.
Cited by 0Open access
Yu Wang · 2006
Written in Java, DisjointSet implements an concurrent Union-Find data structure discussed in [1] using disjoint forests. Concurrency is implemented using threads in Java and is guaranteed calling lock and unlock methods before and after the critical sections. We call such data structure thread safe. To allow any object to be contained in the disjoint set, our implementation uses generics[2], which is represented by T. For testing, we use long integer type, Long for the disjoint set. Testing results from both serial code and concurrent code are compared. The Java code is to be compiled by Sun JDK 1.5.
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Amritam Sarcar, Yoonsik Cheon, Class Invariants et al. · 2010
Abstract—The Java Modeling Language (JML) is a formal interface specification language to document the behavior of Java program modules and has been used in many research and industrial projects. However, its inability to support Java 5 features such as generics is reducing its user base significantly. Besides, the JML compiler is on average 8.5 times slower than the javac Java compiler. In this paper, we present a new JML compiler built on the Eclipse Java compiler to support Java 5 features. We used a technique called AST merging to implement coarse-grained incremental compilation. In our experiments we observed a significant improvement in compilation speed; the new compiler is 3 to 4.5 times faster than the current one. Keywords-incremental compilation; pre and postconditions; runtime assertion checking; AST merging; Eclipse; JML I.
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Herbert Schildt · 2000
Thoroughly updated for Java Platform Standard Edition 21, this practical resource uses a proven, step-by-step approach to teach the fundamentals of Java. You will discover how to get started programming in Java from the very first chapter. Written by Java guru Herbert Schildt and updated by Dr. Danny Coward, the book starts with the basics, such as how to create, compile, and run a Java program. From there, you will learn essential Java keywords, syntax, and commands. Java: A Beginner's Guide, Tenth Edition covers the basics and touches on advanced features, including multithreaded programming, generics, Lambda expressions, and Swing. Enumeration, modules, and interface methods are also clearly explained. This proven guide delivers the appropriate mix of theory and practical coding necessary to get readers up and running developing their own Java applications from the ground up or customize existing code
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Srinivasa Raghavan, Aravind · OakTrust (Texas A&M University Libraries) · 2010
Generics has recently been adopted to many mainstream object oriented languages,\nsuch as C# and Java. As a particular design choice, generics in C# and Java\nuse a sub-typing relation to constraint type parameters. Failing to encapsulate type\nparameters within generic interfaces and inability to encapsulate type constraints as\npart of an interface definition have been identified as deficiencies in the way this design\nchoice has been implemented in these languages. These deficiencies can lead to\nverbose and redundant code. In particular, they have been reported to affect the\ndevelopment of highly generic libraries. To address these issues, extending object\noriented interfaces and sub-typing with associated types and constraint propagation\nhas been proposed and studied in an idealized small-scale formal setting. This thesis\nbuilds on this previous work and provides a design and implementation of the\nextensions in full C#. We also present a proof of soundness of the Featherweight\nGeneric Java (FGJ) formalism extended with interfaces. This property was assumed\nin a proof of type safety of associated types and constraint propagation, but no proof\nfor the property was provided.
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Hamid Abdul Basit, Damith C. Rajapakse, Stan Jarzabek · 2011
Generic (polymorphic) type-safe containers are the primary motivation for generics (in Ada, Eiffel, and recently proposed additions to Java and C#) and templates (in C++). We studied buffer classes and found that they could not be unified by type parameters. At times, unification required non-type parameters (e.g., parameters representing operators, keywords or algorithmic details) and at other times – the nature of variations was not parametric which called for a more general unification mechanism. Investigation of the reasons behind the observed symptoms revealed that unification problems were caused by “feature combinations”: Other than by type, each class was also affected by yet other features and implementation of various features interacted with classes in rather chaotic ways. In the paper, we show examples of how the feature combination manifests in programs. We believe that we are dealing with a fundamental phenomenon that will cause many other class containers and application programs to suffer from the same problem. In our case study, some of the difficulties were caused by limitations specific to Java generics. Yet others were more fundamental and reflected the weakness of parameterization mechanisms supported by today’s programming languages. We suggest that stronger generics systems would considerably enhance capabilities of programming languages in the areas of generic programming, reuse and maintenance. We refer to a meta-level parameterization mechanism that can effectively unify any types of variations triggered by feature combination, and can be applied to any programming language. We discuss the trade-offs between conventional type-parametric generics built-into today’s programming languages and the meta-level parameterization approach.
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Nabil El Boustani, Jurriaan Hage · 2009
Since version 1.5, generics (parametric polymorphism) are part of the Java language. However, adding parametric polymorphism to a language that is built on inclusion polymorphism can be confusing to a novice programmer, because the typing rules are suddenly different and, in the case of Generic Java, quite complex. Indeed, the main Java compilers, Eclipse's EJC compiler and Sun's JAVAC, do not even accept the same set of programs. Moreover, experience with these compilers shows that the error messages provided by them leave more than a little to be desired. To alleviate the latter problem, we describe how to adapt the type inference process of Java to obtain better error diagnostics for generic method invocations. The extension has been implemented into the JastAdd extensible Java compiler.
Cited by 14
Poornachandra Sarang · 2011
Develop, Compile, and Debug High-Performance Java Applications Take your Java skills to the next level using the expert programming techniques contained in this Oracle Press guide. Featuring real-world code samples and detailed instructions, Java Programming demonstrates how to fully utilize the powerful features of Java SE 7. Find out how to design multithreaded and network applications, integrate structured exception handling, use Java libraries, and develop Swing-based GUIs and applets. Inheritance, generics, and utility classes are are covered in this practical resource. Create custom classes, methods, arrays, and operators Control program flow using conditional statements Handle multithreaded, network, and I/O programming Learn new constructs in multithreading Incorporate enums, annotations, and autoboxing Recover from errors, input failures, and exceptions Use Java Swing to build lightweight GUIs and applets Cut development time using the collections framework Work with the latest Java libraries and utility classes
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Trembley · Zenodo (CERN European Organization for Nuclear Research) · 2024
<h3>Java: A Beginner's Guide, Ninth Edition by</h3>\n<p> </p>\n<p> </p>\n<p>Download Book ➡ <a href="http://ebooksharez.info/download.php?group=book&from=zenodo.org&id=620731&lnk=903">Link</a></p>\n<p>Read Book Online ➡ <a href="http://ebooksharez.info/download.php?group=book&from=zenodo.org&id=620731&lnk=903">Link</a></p>\n<p> </p>\n<p> </p>\n<ul>\n<li>Java: A Beginner's Guide, Ninth Edition</li>\n<li> </li>\n<li>Page: 752</li>\n<li>Format: pdf, ePub, mobi, fb2</li>\n<li>ISBN: 9781260463552</li>\n<li>Publisher: McGraw-Hill Professional Publishing</li>\n</ul>\n<p> </p>\n<h3>Rapidshare books free download Java: A Beginner's Guide, Ninth Edition</h3>\n<p><br><br></p>\n<p>New Releases in Beginner's Guides to Java Programming New Releases in Beginner's Guides to Java Programming. #1. Java: A Beginner's Guide, Ninth Edition · Herbert Schildt. Paperback. Herbert Schildt: Kindle Store - Amazon.com 1-16 of 23 results · Java: The Complete Reference, Twelfth Edition · Java: A Beginner's Guide, Ninth Edition · Java: A Beginner's Guide, Eighth Edition. Java: A Beginner's Guide, Ninth Edition - Bulk Bookstore This book title, Java: A Beginner's Guide, Ninth Edition, ISBN: 9781260463552, by Herbert Schildt, published by McGraw Hill LLC (January 7, 2022) is available Publisher: McGraw-Hill Education (December 6, List Price: $40.00Format: Book Java: A Beginner's Guide, 9th Edition - 好资源收集站 Java: A Beginner's Guide, Ninth Edition covers the basics and touches on advanced features, including multithreaded programming, generics,  Java, A Beginner's Guide, 5th Edition: Schildt, Herbert - Amazon Fully updated to cover Java Platform, Standard Edition 7 (Java SE 7), Java: A Beginner's Guide, Fifth Edition starts with the basics, such as how to compile  Java: A Beginner's Guide, Ninth Edition (Paperback) Java: A Beginner's Guide, Ninth Edition covers the basics and touches on advanced features, including multithreaded programming, generics,  New Releases in Beginner's Guides to Java Programming Amazon Hot New Releases Our best-selling new and future releases. Updated hourly. New Releases in Beginner's Guides to Java Programming. #1. Java: A  Schildt Herbert-Java A Beginners Gd 9Th /E 9/E BOOK NEW Java: A Beginner's Guide, Ninth Edition covers the basics and touches on advanced features, including multithreaded programming, generics, </p>
Cited by 0Open access
Lutz Hamel, John E. McCarthy · 2016
class Fruit { abstract void print(); } class Apple extends Fruit { void print() { System.out.println(Apple); } } class Orange extends Fruit { void print() { System.out.println(Orange); } } class Pear extends Fruit { void print() { System.out.println(”Pear); } } Java – Polymorphic List class Basket { public static void main(String[] args) { List list = new ArrayList (); list.add(new Apple()); list.add(new Orange()); for(Fruit fruit : list){ fruit.print(); } } } Java – Polymorphic List So much code that it does not even fit into a single terminal window! Java – Polymorphic List • Needs class hierarchy • Needs generics as container • Lots of scaffolding, lots of code – lots of possibility for error PLs in 20XX 2015 2014 Source: http://spectrum.ieee.org/computing/software/the-2015-top-ten-programming-languages
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Todd Veldhuizen · 2015
Two traditions of generics • Safe (but restricted expressiveness)! Alphard, CLU, ML, Haskell, Java, etc.! A parade of language features to increase expressiveness: parametric polymorphism, F-bounded polymorphism, type classes,... • Unsafe (but very expressive)! EL1 [Wegbreit(1974), Holloway(1971)] — arbitrary expressions in type position, compiler had built-in partial evaluator for these.! C++! A parade of language features to increase safety: signatures, concepts
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Adriaan Moors, Frank Piessens, Martin Odersky · ACM SIGPLAN Notices · 2008
With Java 5 and C# 2.0, first-order parametric polymorphism was introduced in mainstream object-oriented programming languages under the name of generics. Although the first-order variant of generics is very useful, it also imposes some restrictions: it is possible to abstract over a type, but the resulting type constructor cannot be abstracted over. This can lead to code duplication. We removed this restriction in Scala, by allowing type constructors as type parameters and abstract type members. This paper presents the design and implementation of the resulting type constructor polymorphism. Furthermore, we study how this feature interacts with existing object-oriented constructs, and show how it makes the language more expressive.
Cited by 9Open access
Stephanie Weirich, Liang Huang · Electronic Notes in Theoretical Computer Science · 2005
Type-directed programming is an important and widely used paradigm in the design of software. With this form of programming, an application may analyze type information to determine its behavior. By analyzing the structure of data, many operations, such as serialization, cloning, adaptors and iterators may be defined once, for all types of data. That way, as the program evolves, these operations need not be updated—they will automatically adapt to new data forms. Otherwise, each of these operations must be individually redefined for each type of data, forcing programmers to revisit the same program logic many times during a program's lifetime. The Java language supports type directed programming with the instanceof operator and the Java Reflection API. These mechanisms allow Java programs to depend on the name and structure of the run-time classes of objects. However, the Java mechanisms for type-directed programming are difficult to use. They also do not integrate well with generics, an important new feature of the Java language. In this paper, we describe the design of several expressive new mechanisms for type-directed programming in Java, and show that these mechanisms are sound when included in a language similar to Featherweight Java. Basically, these new mechanisms pattern-match the name and structure of the type parameters of generic code, instead of the run-time classes of objects. Therefore, they naturally integrate with generics and provide strong guarantees about program correctness. As these mechanisms are based on pattern matching, they naturally and succinctly express many operations that depend on type information. Finally, they provide programmers with some degree of protection for their abstractions. Whereas instanceof and reflection can determine the exact run-time type of an object, our mechanisms allow any supertype to be supplied for analysis, hiding its precise structure.
Cited by 6Open access
Stephanie Weirich, Liang Huang · 2004
Type-directed programming is an important and widely used paradigm in the design of software. With this form of programming, a program may analyze type information to determine its behavior. By analyzing the structure of data, many operations, such as serialization, cloning, structural equality, and iterators, may be defined once, for all types of data. The benefit of type-directed programming is that as software evolves, operations need not be updated—they will automatically adapt to new data forms. Otherwise, each of these operations must be individually redefined for each type of data, forcing programmers to revisit the same program logic many times during a program’s lifetime. The support for type-directed programming in the Java language includes the instanceof operator and the Java Reflection API. These mechanisms allow Java programs to depend on the run-time classes of objects. However, these mechanisms are difficult to use correctly and require needless casting. They also do not integrate well with generics. In this paper, we describe the design of several expressive new mechanisms for type-directed programming in Java. Our new mechanisms are based on an extension of Java with first-class types (such as NextGen), so they naturally include support for generics. Because these new mechanisms analyze first-class type information directly, instead of examining the run-time class of objects, they can provide strong guarantees about program correctness. Furthermore, our new mechanisms are based on pattern matching, so they naturally and succinctly express many type-directed algorithms. 1
Cited by 0
2008
Abstract Type-directed programming is an important and widely used paradigm in the design of software. With this form of programming, a program may analyze type information to determine its behavior. By analyzing the structure of data, many operations, such as serialization, cloning, structural equality, and iterators, may be defined once, for all types of data. The benefit of type-directed programming is that as software evolves, operations need not be updated--they will automatically adapt to new data forms. Otherwise, each of these operations must be individually redefined for each type of data, forcing programmers to revisit the same program logic many times during a program's lifetime. The support for type-directed programming in the Java language includes the instanceof operator and the Java Reflection API. These mechanisms allow Java programs to depend on the run-time classes of objects. However, these mechanisms are difficult to use correctly and require needless casting. They also do not integrate well with generics. In this paper, we describe the design of several expressive new mechanisms for type-directed programming in Java. Our new mechanisms are based on an extension of Java with first-class types (such as NextGen), so they naturally include support for generics. Because these new mechanisms analyze first-class type information directly, instead of examining the run-time class of objects, they can provide strong guarantees about program correctness. Furthermore, our new mechanisms are based on pattern matching, so they naturally and succinctly express many type-directed algorithms. 1
Cited by 0
2004
Abstract Type-directed programming is an important and widely used paradigm in the design of software. With this form of programming, a program may analyze type information to determine its behavior. By analyzing the structure of data, many operations, such as serialization, cloning, structural equality, and iterators, may be defined once, for all types of data. The benefit of type-directed programming is that as software evolves, operations need not be updated--they will automatically adapt to new data forms. Otherwise, each of these operations must be individually redefined for each type of data, forcing programmers to revisit the same program logic many times during a program's lifetime. The support for type-directed programming in the Java language includes the instanceof operator and the Java Reflection API. These mechanisms allow Java programs to depend on the run-time classes of objects. However, these mechanisms are difficult to use correctly and require needless casting. They also do not integrate well with generics. In this paper, we describe the design of several expressive new mechanisms for type-directed programming in Java. Our new mechanisms are based on an extension of Java with first-class types (such as NextGen), so they naturally include support for generics. Because these new mechanisms analyze first-class type information directly, instead of examining the run-time class of objects, they can provide strong guarantees about program correctness. Furthermore, our new mechanisms are based on pattern matching, so they naturally and succinctly express many type-directed algorithms. 1
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