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Regular expressions
Regular expressions

... Because  matching  is  a  very  common  problem,  over  the  years   computer  scientists  have  identified  a  set  of  patterns  that 1. Are  very  common 2. Can  be  searched  for    efficiently ...
PDF - Complete Book (3.38 MB)
PDF - Complete Book (3.38 MB)

... built with an equivalent API called the XML API. This API works by sending and receiving XML documents over an HTTP connection. This scheme allows the use of any programming language with the ability to create and parse XML and handle HTTP connections. Languages such as Perl or ASP in conjunction wi ...
Error location in Python: where the mutants hide
Error location in Python: where the mutants hide

... errors in programs written in the Java programming language. UnnaturalCode produced additional diagnostic information for Java source files that failed to compile. UnnaturalCode used an n-gram language model to identify snippets of source code that it finds unlikely to be correct. UnnaturalCode was ...
Chapter 3
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... processing the request and generating the response are both handled by a single servlet class ...
Threading A thread is a thread of execution in a program. The Java
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... Processes are often seen as synonymous with programs or applications. However, what the user sees as a single application may in fact be a set of cooperating processes. To facilitate communication between processes, most operating systems support Inter Process Communication (IPC) resources, such as ...
Widgets
Widgets

... -  Widget toolkit wraps OS widgets for programming language -  BWS can dispatch events to a specific widget -  Examples: nested X Windows, Java’s AWT, OSX Cocoa, standard ...
Concurrent Programming in Java
Concurrent Programming in Java

... actions that the CPU performs • Process - individual program, representing a larger and more complex flow of control handled by the operating system • Thread – specific, smaller flow of control within a given process • Multitasking - procedure that allows threads or processes to share time on a sing ...
Thread
Thread

... Let C denote the union of critical regions ci for resource R. T is the set of threads tj having access to R. The mutual exclusive access to R is satisfied if at any time instance only at most one tj  T executes ck  C. ...
Software Engineering with Reusable Components
Software Engineering with Reusable Components

... To create EJB server-side component, the developer ...
GroveX10Overview - The X10 Programming Language
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...  Medium-scale commodity systems – ~100 nodes (~1000 core and ~1 terabyte main memory) – Goal: deliver main-memory performance with simple programming model (accessible to Java programmers) ...
Android
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... l From the previous image the following guidelines for the use of the different methods can be derived: l onCreate(): Use this method to create and instantiate the objects you will be using in your application. l onResume(): Use this one to start any services or code that needs to run while your ...
Introduction to Threads
Introduction to Threads

... A thread shares with its sibling threads " -  The code, data and heap section" -  Other OS resources, such as open files and signals " ...
Threads Threads, User vs. Kernel Threads, Java Threads, Threads
Threads Threads, User vs. Kernel Threads, Java Threads, Threads

... Question: what will the output be? Answer: Impossible to tell for sure If you know the implementation of the JVM on your particular machine, then you may be able to tell  But if you write this code to be run anywhere, then you can’t expect to know what happens ...
handling the exception
handling the exception

... If an exception is not declared, then it must be handled within the method If an exception is declared, then the responsibility for handling it is shifted to some other calling method Note that if a method definition encloses an invocation of a second method, and the second method can throw an excep ...
Chapter 14
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... because the second catch clause can never be used. The code contained in the (optional) finally clause is executed whether an exception is thrown in the try construct or not. This is useful for “cleanup” code (closing files, other freeing of resources, ...) that must always be executed. Binding of e ...
4on1 - FSU Computer Science
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... Erroneous user input (e.g. entering a date in the wrong format) File input and output problems (e.g. end of file or disk full) Problems with arithmetic (e.g. overflow) Hardware and software interrupts (e.g. hitting the break key) Programming language implementation of exception handling can make def ...
9. Exception Handling - FSU Computer Science
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... Erroneous user input (e.g. entering a date in the wrong format) File input and output problems (e.g. end of file or disk full) Problems with arithmetic (e.g. overflow) Hardware and software interrupts (e.g. hitting the break key) Programming language implementation of exception handling can make def ...
Programming the Web Server Robert M. Dondero, Ph.D. Princeton University 1
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... Bad news... ...
No Slide Title
No Slide Title

... • javax.swing.plaf.motif (or com.sun.java.swing.plaf.motif) • javax.swing.plaf.windows (or com.sun.java.swing.plaf.windows) ...
Recursion
Recursion

...  Recursion is a math and programming tool  Technically, not necessary  Wasn’t available in early programming languages ...
Introduction to JSON (JavaScript Object Notation)
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... Even though Sang Shin is a full-time employee of Sun Microsystems, the contents here are created as his own personal endeavor and thus does not reflect any official stance of Sun Microsystems ...
Lecture 2 Exercise 1 The Shared Update Problem Mutual Exclusion
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... ◦ No variables are shared between critical and non‐ critical sections and the protocol ◦ The critical section always terminates ◦ Read/Write operations are atomic ( ...
Computing Science - Thompson Rivers University
Computing Science - Thompson Rivers University

... function; they come into existence when the function is entered, and disappear when it is left. External variables, on the other hand, are permanent, so they can retain values from one function invocation to the next. Thus if two functions must share some data, yet neither calls the other, it is oft ...
“while” loop
“while” loop

... 6. If the temperatuer is >=25 and less than 40, display “It is hot! Seek the beach!”. Spring 2006 ...
LISP:Power and Elegance in ONE
LISP:Power and Elegance in ONE

... – A set is made up of objects.  In mathematics a set is represented like so {A, B, C,}.  In lisp, this simple set would look like (A B C).  A more complex set- (A (B C) 123) ...
1 2 3 4 5 ... 29 >

Java performance

In software development, the Java programming language was historically considered slow because compiled Java programs run on the Java Virtual Machine rather than directly on the computer's processor like C and C++ programs do; however, in newer Java versions the execution performance has been optimized significantly mainly thanks to the introduction of just-in-time compilation. Java performance is a matter of concern because lots of business software has been written in Java after the language quickly became popular in the late 1990s and early 2000s. Concerns over its performance led to the development of specialized hardware able to run Java directly, dubbed Java processors. The performance of a compiled Java program depends on how optimally its particular tasks are managed by the host Java Virtual Machine (JVM), and how well the JVM takes advantage of the features of the hardware and OS in doing so. Thus, any Java performance test or comparison has to always report the version, vendor, OS and hardware architecture of the used JVM. In a similar manner, the performance of the equivalent natively compiled program will depend on the quality of its generated machine code, so the test or comparison also has to report the name, version and vendor of the used compiler, and its activated optimization directives.Historically, the execution speed of Java programs improved significantly due to the introduction of Just-In Time compilation (JIT) (in 1997/1998 for Java 1.1), the addition of language features supporting better code analysis, and optimizations in the JVM itself (such as HotSpot becoming the default for Sun's JVM in 2000). Hardware execution of Java bytecode, such as that offered by ARM's Jazelle, can also offer significant performance improvements.
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