This lets software developers detect and prevent errors in their Java programs. The Checker Framework comes with checkers for specific types of errors: Pluggable types The Checker Framework supports adding pluggable type systems to the Java language in a backward-compatible way. The Checker Framework lets you run an additional type-checker as a plug-in to the javac compiler.
History of compiler construction A diagram of the operation of a typical multi-language, multi-target compiler Theoretical computing concepts developed by scientists, mathematicians, and engineers formed the basis of digital modern computing development during World War II.
Primitive binary languages evolved because digital devices only understand ones and zeros and the circuit patterns in the underlying machine architecture.
In the late s, assembly languages were created to offer a more workable abstraction of the computer architectures. Limited memory capacity of early computers led to substantial technical challenges when the first compilers were designed.
Therefore, the compilation process needed to be divided into several small programs. The front end programs produce the analysis products used by the back end programs to generate target code. As computer technology provided more resources, compiler designs could align better with the compilation process.
The human mind can design better solutions as the language moves from the machine to a higher level. So the development of high-level languages followed naturally from the capabilities offered by the digital computers.
High-level languages are formal languages that are strictly defined by their syntax and semantics which form the high-level language architecture. Elements of these formal languages include: Alphabet, any finite set of symbols; String, a finite sequence of symbols; Language, any set of strings on an alphabet.
The sentences in a language may be defined by a set of rules called a grammar. While no actual implementation occurred until the s, it presented concepts later seen in APL designed by Ken Iverson in the late s. High-level language design during the formative years of digital computing provided useful programming tools for a variety of applications: The compiler could be viewed as a front end to deal with analysis of the source code and a back end to synthesize the analysis into the target code.
Optimization between the front end and back end could produce more efficient target code. InLISP 1. Edwards, a compiler and assembler written by Tim Hart and Mike Levin. In the 60s and early 70s, the use of high-level languages for system programming was still controversial due to resource limitations.
So researchers turned to other development efforts.
Unics eventually became spelled Unix. Ina new PDP provided the resource to define extensions to B and rewrite the compiler. The initial design leveraged C language systems programming capabilities with Simula concepts.
Object-oriented facilities were added in In many application domains, the idea of using a higher-level language quickly caught on. Because of the expanding functionality supported by newer programming languages and the increasing complexity of computer architectures, compilers became more complex.
PQCC might more properly be referred to as a compiler generator. PQCC research into code generation process sought to build a truly automatic compiler-writing system.
The effort discovered and designed the phase structure of the PQC. The PQCC project investigated techniques of automated compiler construction. The design concepts proved useful in optimizing compilers and compilers for the object-oriented programming language Ada.
Initial Ada compiler development by the U. Military Services included the compilers in a complete integrated design environment along the lines of the Stoneman Document. While the projects did not provide the desired results, they did contribute to the overal effort on Ada development.
VADS provided a set of development tools including a compiler.
GNAT is free but there is also commercial support, for example, AdaCore, was founded in to provide commercial software solutions for Ada. High-level languages continued to drive compiler research and development. Focus areas included optimization and automatic code generation. Trends in programming languages and development environments influenced compiler technology.
The interrelationship and interdependence of technologies grew. The advent of web services promoted growth of web languages and scripting languages.
Scripts trace back to the early days of Command Line Interfaces CLI where the user could enter commands to be executed by the system. User Shell concepts developed with languages to write shell programs.The following picture shows the default Java perspective.
The Package Explorer view is on the left. In the middle you see the open editors.
Several editors are stacked in the same container and you can switch between them by clicking on the corresponding tab. Via drag and drop you can move an editor to a new position in the Eclipse IDE.
The following picture shows the default Java perspective. The Package Explorer view is on the left. In the middle you see the open editors.
Several editors are stacked in the same container and you can switch between them by clicking on the corresponding tab. Via drag and drop you can move an editor to a new position in the Eclipse IDE. Eclipse (@ initiativeblog.com) is an open-source Integrated Development Environment (IDE) supported by IBM.
Eclipse is popular for Java application development (Java SE and Java EE) and Android apps.
It also supports C/C++, PHP, Python, Perl, and other web project developments via extensible plug-ins. Eclipse is cross-platform and runs under Windows, Linux and Mac OS. Chapter 1 Introduction.
The Checker Framework enhances Javas type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs.
Install the IDE. Install the JRE with the default settings; To install eclipse, unzip the content to C:\Program Files\eclipse; Create a shortcut to initiativeblog.com on the desktop. Jun 10, · Apache POI JARs to Read/Write Excel File in Java Though there are couple of open source library available to read and write from Excel file in Java e.g.
JXL, the most feature rich and most popular one is Apache POI library.