For example, traditional GUI toolkits provide layout managers, in one form or another, that allow layout algorithms to be encapsulated and reused. This article explores a template mechanism for Java. Server Pages (JSP) that, like layout managers, encapsulates layout so it can be reused instead of replicated. Because layout undergoes many changes over the course of development, it's important to encapsulate that functionality so it can be modified with minimal impact to the rest of the application. In fact, layout managers demonstrate an example of one of the tenets of object- oriented design: encapsulate the concept that varies, which is also a fundamental theme for many design patterns. JSP does not provide direct support for encapsulating layout, so Webpages with identical formats usually replicate layout code; for example, Figure 1 shows a Webpage containing header, footer, sidebar, and main content sections. Figure 1. Webpage layout. The layout of the page shown in Figure 1 is implemented with HTML table tags: Example 1. Including content< html> < head> < title> JSP Templates< /title> < /head>. In the example listed above, content is included with the JSP include directive, which allows the content of the page to vary - - by changing the included files - - without modifying the page itself. However, because layout is hard coded, layout changes require modifications to the page. If a Website has multiple pages with identical formats, which is common, even simple layout changes require modifications to all of the pages. To minimize the impact of layout changes, we need a mechanism for including layout in addition to content; that way, both layout and content can vary without modifying files that use them. That mechanism is JSP templates. Using templates. Templates are JSP files that include parameterized content. The templates discussed in this article are implemented with a set of custom tags: template: get, template: put, and template: insert. The template: get tag accesses parameterized content, as illustrated in Example 2. Webpages with the format shown in Figure 1. Example 2. a. A template< %@ taglib uri='/WEB- INF/tlds/template. Example 2. a is nearly identical to Example 1, except we use template: get instead of the include directive. Let's examine how template: get works. Java bean with the specified name from request scope. The bean contains the URI (Uniform Resource Identifier) of a Web component that's included by template: get. For example, in the template listed in Example 2. URI - - header. html - - from a bean named header in request scope. Subsequently, template: get includes header. The template is included with template: insert. Example 2. b illustrates the use of the put and insert tags: Example 2. Using the template from Example 2. WEB- INF/tlds/template. Template. jsp'>. Templates' direct='true'/>. The insert start tag specifies the template to be included, in this case the template listed in Example 2. Build a Rich Client Platform To-Do Application in NetBeans IDE. Practice using NetBeans IDE features that improve code quality and increase developer productivity. Learn how to use Netbeans IDE Keyboard Shortcuts using Code Template. Advantage of using netbeans. Suppose you print something on screen then you can use SOUT and tab. Orelse click on help and. Use JSP templates to encapsulate Webpage layout and encourage modular design. Code Templates in NetBeans IDE for PHP. Code templates are prewritten snippets of code provided by NetBeans IDE. You can paste a snippet into your code by using code completion or the template. Each put tag stores a bean in request scope and the insert end tag includes the template. The template subsequently accesses the beans as described above. A direct attribute can be specified for template: put; if direct is set to true, the content associated with the tag is not included by template: get, but is printed directly to the implicit out variable. Displaying Line Numbers. By default, line numbers are switched off in the Source Editor to save space and reduce visual clutter. If you need the line numbers, you can turn them on by choosing View .In Example 2. b, for example, the title content - - JSP Templates - - is used for the window title. Websites containing multiple pages with identical formats have one template, such as the one listed in Example 2. JSP pages, such as Example 2. If the format is modified, changes are restricted to the template. Another benefit of templates and including content in general is modular design. For example, the JSP file listed in Example 2. Example 2. c. Example 2. Also, although header. HTML file, it does not contain the usual preamble of HTML tags such as < html> or < body> because those tags are defined by the template. That is, because the template includes header. Note: JSP provides two ways to include content: statically, with the include directive, and dynamically, with the include action. The include directive includes the source of the target page at compile time and is equivalent to C's #include or Java's import. Sometimes you may not remember how an items starts, making it difficult to use code completion. Instead, to see all items that relate to listening to property changes, you can. Thanks Josch for adding your favorite shortcut. Let other readers also add their favorite shortcuts in comments and this will be a list of most favorite shortcuts in NetBeans IDE with regards Tushar. The include action includes the target's response generated at runtime. Like the JSP include action, templates include content dynamically. So, although the JSP pages in Example 1 and Example 2. Optional content. All template content is optional, which makes a single template useful to more Webpages. For example, Figure 2. Figure 2. b show two pages - - login and inventory - - that use the same template. Both pages have a header, footer, and main content. The inventory page has an edit panel (which the login page lacks) for making inventory changes. Figure 2. a. A login form. Figure 2. b. An inventory page. Below, you'll find the template shared by the login and inventory pages: < %@ taglib uri='template. For example, the same JSP template, which includes the edit panel only when the user's role is curator, produces the two pages shown in Figures 3. Figure 3. a. Inventory page for curators. Figure 3. b. Inventory page for other users. The template used in Figures 3. Let's look at how the tag handler for template: get uses the role attribute: public class Get. Tag extends Tag. Support . Each insert start tag creates a hashtable and pushes it on the stack. The enclosed put tags create beans and store them in the newly created hashtable. Subsequently, get tags in the included template access the beans in the hashtable. Figure 4 shows how the stack is maintained for nested templates. Figure 4. Storing template parameters in request scope. Each template in Figure 4 accesses the correct footer; footer. If the beans were stored directly in request scope, step 5 in Figure 4 would overwrite the footer bean specified in step 2. Template tag implementations. The remainder of this article examines the implementation of the three template tags: insert, put, and get. We begin with sequence diagrams, starting with Figure 5. It illustrates the sequence of events for the insert and put tags when a template is used. Figure 5. Sequence diagrams for the put and insert tags. If a template stack does not already exist, the insert start tag creates one and places it in request scope. A hashtable is subsequently created and pushed on the stack. Each put start tag creates a Page. Parameter bean, stored in the hashtable created by the enclosing insert tag. The insert end tag includes the template. The template uses get tags to access the beans created by put tags. After the template is processed, the hashtable created by the insert start tag is popped off the stack. Figure 6 shows the sequence diagram for template: get. Figure 6. Sequence diagrams for the get tag. Template tag listings. Tag handler implementations for the template tags prove straightforward. Example 3. a lists the Insert. Tag class - - the tag handler for template: insert. These detailed instructions are for users of the Net. Beans IDE. The Net. Beans IDE runs on the Java platform, which means that you can use it with any operating system for which there is a JDK available. These operating systems include Microsoft Windows, Solaris OS, Linux, and Mac OS X. A Checklist. To write your first program, you'll need: The Java SE Development Kit (JDK 7 has been selected in this example)The Net. Beans IDECreating Your First Application. Your first application, Hello. World. App, will simply display the greeting . Using IDE projects eliminates configuration issues normally associated with developing on the command line. You can build or run your application by choosing a single menu item within the IDE. Add code to the generated source file. A source file contains code, written in the Java programming language, that you and other programmers can understand. As part of creating an IDE project, a skeleton source file will be automatically generated. You will then modify the source file to add the . The instructions contained within this file are known as bytecodes. Run the program. The IDE invokes the Java application launcher tool (java), which uses the Java virtual machine to run your application. Create an IDE Project. To create an IDE project: Launch the Net. Beans IDE. On Microsoft Windows systems, you can use the Net. Beans IDE item in the Start menu. On Solaris OS and Linux systems, you execute the IDE launcher script by navigating to the IDE's bin directory and typing ./netbeans. On Mac OS X systems, click the Net. Beans IDE application icon. In the Net. Beans IDE, choose File . You should see the following components: The Projects window, which contains a tree view of the components of the project, including source files, libraries that your code depends on, and so on. The Source Editor window with a file called Hello. World. App. java open. The Navigator window, which you can use to quickly navigate between elements within the selected class. Net. Beans IDE with the Hello. World. App project open. Add JDK 8 to the Platform List (if necessary)It may be necessary to add JDK 8 to the IDE's list of available platforms. To do this, choose Tools . You should now see this newly added platform: The Java Platform Manager. To set this JDK as the default for all projects, you can run the IDE with the - -jdkhome switch on the command line, or by entering the path to the JDK in the netbeans. You should see a screen similar to the following: The IDE is now configured for JDK 8. Add Code to the Generated Source File. When you created this project, you left the Create Main Class checkbox selected in the New Project wizard. The IDE has therefore created a skeleton class for you. Both the compiler (javac) and launcher (java) are case- sensitive, so you must capitalize consistently. Hello. World. App is not the same as helloworldapp. You have successfully compiled your program! If the build output concludes with the statement BUILD FAILED, you probably have a syntax error in your code. Errors are reported in the Output window as hyperlinked text. You double- click such a hyperlink to navigate to the source of an error. You can then fix the error and once again choose Run . You can see where the new file is generated by opening the Files window and expanding the Hello World App/build/classes/helloworldapp node as shown in the following figure. Files window, showing the generated . Now that you have built the project, you can run your program. Run the Program. From the IDE's menu bar, choose Run ! Your program works! Continuing the Tutorial with the Net. Beans IDEThe next few pages of the tutorial will explain the code in this simple application. After that, the lessons go deeper into core language features and provide many more examples. Although the rest of the tutorial does not give specific instructions about using the Net. Beans IDE, you can easily use the IDE to write and run the sample code. The following are some tips on using the IDE and explanations of some IDE behavior that you are likely to see: Once you have created a project in the IDE, you can add files to the project using the New File wizard. If you use the Run Main Project command, the IDE will run the file that the IDE associates as the main class of the main project. Therefore, if you create an additional class in your Hello. World. App project and then try to run that file with the Run Main Project command, the IDE will run the Hello. World. App file instead. You might want to create separate IDE projects for sample applications that include more than one source file. As you are typing in the IDE, a code completion box might periodically appear. You can either ignore the code completion box and keep typing, or you can select one of the suggested expressions. If you would prefer not to have the code completion box automatically appear, you can turn off the feature. The IDE prompts you with the Rename dialog box to lead you through the options of renaming the class and the updating of code that refers to that class. Make the changes and click Refactor to apply the changes. This sequence of clicks might seem unnecessary if you have just a single class in your project, but it is very useful when your changes affect other parts of your code in larger projects. For a more thorough guide to the features of the Net. Beans IDE, see the. Net. Beans Documentation page.
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This page will be updated after publishing. Java performance tuning website. Optimizing your Java code requires an understanding of how the different elements in Java interact, and how it interacts with the operating system that is it running on. Optimize Jpeg Java, free optimize jpeg java software downloads, Page 3. This is a page about the elusive subject of program performance optimization. Before you proceed towards such lofty goals, you should examine your reasons for doing so. I have covered most of essential functionality in the framework. JMH profilers will be the subject. This article covers JMH 1. It takes care of all. JMH also contains built- in support. It generates target/benchmarks. They will let you get an insight in your microbencmarks, which could not be available using. All JDK updates up to Java 7u. Don't use Math. Context. UNLIMITED. for that reason - it is equivalent to no context at all. This means that this method now has a linear complexity compared to. The advantage of this change is a slightly smaller memory footprint of a. String (8 bytes less than before) and a guarantee to avoid memory leaks caused by. String. substring (see. String packing part 1: converting characters to bytes for. Java object memory layout). This method is currently not public and could be accessed without reflection. Hashing. string. Hash. String) call. This method is used by 7 JDK hash- based. Not applicable to Java 8. See this article for more details. It will allow you to save memory occupied by the duplicate strings without writing a single line of Java code. It is a part of G1 garbage collector, so. G1 collector: - XX: +Use. G1. GC - XX: +Use. String. Deduplication. String deduplication is an optional G1 phase. It depends on the current system load. You don't need to write code to use this feature. String objects, each of those occupying 2. The minimal age of processed strings is managed by. XX: String. Deduplication. Age. Threshold=3 JVM parameter (3 is the default value of this parameter). You should avoid using direct byte buffers. Byte. Buffer bulk. Unsafe (though Byte. Buffer methods are always a little slower). Do not call Byte. Buffer. put! Always use String. Java 7. You can easily gain 1. Pattern methods with. Use an ordinary long instead. Calendar is useful for all sorts of date calculations and i. I advice you to read this article in conjunction with a. Date, java. util. Calendar and java. Simple. Date. Format performance. This article was tested on Joda Time ver 2. In essence it means that. Joda Time release you are using. For affected years date operations performance in Joda. Gregorian. Calendar. The advantage. of Joda parsing is that constructing a parser - Date. Time. Formatter object is extremely cheap, unlike. Simple. Date. Format, so you don't have to cache parsers anymore. It makes them. fast for human datetime arithmetics/conversion. Nevertheless, if you are processing computer time (a. In some rare cases when you are building. String from its byte representation, do not forget about. Byte. Array. Output. Stream. to. String methods. Garbage collecting these copies may take a noticeable time if your application. Inefficient byte. Default size for. Generally it worth increasing any of these. Though, keeping a Buffered. Input. Stream. is still safe. It will greatly speed up file reading. You can also try chaining 2. LZ4. Block. Output. Stream- s with 3. M buffer size to get most out of LZ4. If you want an instance of a wrapper class. It will support. caching of most frequently used values. Never call wrapper classes constructors - they always return. Object, thus bypassing the caching support. If its quality. is sufficient for you, use it instead of CRC3. In any case, use Checksum interface. Adler. 32/CRC3. 2 logic. Shorter blocks will require a noticeable time to be spent. JNI calls. This is far more important. Never write a hash. Code method which returns a constant. If you are working with sets of strings, try to end up with. Bit. Sets, as described in this article. Performance of your code will greatly improve. Creating an exception is too. Parse such values manually for top performance. Logging framework will call to. String method on your object. There is a new codec in Java 8. Base. 64 and there is also one hidden from many eyes (from Java 6): javax. Datatype. Converter. Unfortunately, if you will need. Google Guava will allow you to decode 2. G of data at a time. MB in case of Mi. GBase. 64 / 7. 20. M in case of IHarder and Apache Commons). Unfortunately, Guava does not support. You need to be. careful and split read and write accesses to the outer map. Choose ISO- 8. 85. US- ASCII. As you have seen. This property is achieved. String. equals/equals. Ignore. Case. Most of other Java memory optimization. The main cause of wrapper types usage are. JDK collections, so consider using one of primitive type collection frameworks like. Trove. For example, prefer array- based structures like. Array. List/Array. Deque to. pointer based structures like Linked. List. Such. replacement requires adding a single letter to your code (letter 'T') and no other code changes except the. Such replacement will give you significant memory savings - see table below. Remove static qualifier only when you have to. It means that you are limited by the whole. Java 7 and 8. It is fixed. Approximate the number of distinct. Each string added to the pool will be available. JVM thus further improving the program memory consumption. The simple example in this. String. intern(). You should not. use String. Instead process. only fields with a limited number of possible distinct values (for example, states/provinces if processing addresses) - . CPU costs of String. A routine until the moment the heap will exceed 3. At this time you will be surprised to see that you application is behaving even worse than before : (. What has happened? JVM has switched to using 6. Xmx. 32. G, which means that your app memory footprint has momentarily increased by 1. The actual area. of . There is also guidelines for migrating your code from JDK to Trove. They allow to reduce code required for many common tasks. Migration. to primitive- based collections require a bit more work, but this work will be paid off by massive reduction. On the other hand. Gb - 1 bytes as a size of your array - you may allocate a long. It may be equal to 4 or 8 bytes depending. JVM settings and on the amount of memory you have given to your JVM. It is always 8 bytes for heaps. G, but for smaller heaps it is 4 bytes unless you will turn off - XX: -Use. Compressed. Oops. JVM setting. This will increase the compression. You will get a noticeable data size reduction at a very low CPU cost, which will help you. Often same information. Price. Unsigned. and 3f 8. Try to identify. cases when most of your data can fit into a more compact data type than an original one. Try to identify. cases when most of your data can fit into a more compact data type than an original one. Number- to- number maps. In this case. a map can be converted into the array. After that we try to pack a String into a more compact representation, trying. Objects. That's why they can share internal. They also cache the calculated hash code value, because strings are often. Hash. Map keys or Hash. Set values. But these properties add a great penalty. We can avoid this penalty by implementing our own string replacement objects. Unfortunately, it is not supported anymore in Java 7, maybe due. This is loseless conversion, so you could always convert your binary byte. Your write. requests will be blocked only if OS can't write data faster than your application produces it. On the other hand, even SSD seek is too slow compared to modern CPU speed. On my laptop, CPU. SSD executes a seek operation. Always try to arrange your data. Then we will see what's hidden in the array header and will. You can use sun. misc. Unsafe in. order to treat such references as int fields. Length (int). is stored at offset=1. Changing these values is possible, but care must be taken in order not to extend an updated. Such updates. to static final fields of primitive/String initialized with complile- time expressions will not be. JLS 1. 5. 2. 8) are inlined. You can use. Thread. Throwable), Class. Instance (and throw an exception in the constructor). Unsafe. throw. Exception or use generic type erasure in order to avoid a checked exception. We do not recommend you to use any of these practices : ). In Java you may create an object without calling any of its constructors. There are 2 legal ways to do it - . But there is a way to force it run in the compiled mode. Tags: Java pitfalls, avoid it. In this case try to move that logic into a separate helper class. Use appropriate. String. Of or wrapper types to. String(value) methods instead. Check old code and get rid of. String. Buffer is possible. It is turned on by default in most of Java 7 releases, but it is still turned off in Java 6. Part 1: Writing a simple FIX parser and. Use case: FIX messages processing. Part 2: Composing a message out of fields: possible gateway implementation. FIX message parsing and composing. In essence, we parse a 0x. In the second part we will discuss. String format as a part of a gateway implementation. The only exception is a single character pattern in Java 7. String. index. Of(char). Besides saving CPU cycles on data conversions, you will also. At least, limit the number of such files. The same applies to the case of one application. OS file cache instead of actually reading them from the disk. Dynamic dispatch. Groovy 2. 1. 9 is approximately 3 times slower compared to a normal Java method call due to the need to obtain. Method. Besides performance. Groovy code, letting you. We can check that a double variable contains an integer value if we will cast it to long. Both casts are cheap operations. If we have a double value, which is possibly one ulp off the actual result, we may try to multiply this. If not, try to add. Math. next. After to. If we will divide a long value by a double non- negative power of 1. Same applies to the case of division of a double containing. At the same time we can not replace. N by multiplication by 1. N: the result will be off by ulp in many cases. At the same time. N if we are allowed to round the result using Math. Promocja zdrowia ma tak. PROGRAM PROMOCJI ZDROWIA - Nasze programy. PROGRAM PROMOCJI ZDROWIA POJ. Z kolei w rodzinach o wysokim standardzie . Aby promocja zdrowia w edukacji dzieci w wieku przedszkolnym by. Tworzy je budynek i teren przedszkola, odpowiednio wyposa. Program Promocji Zdrowia. Promocja zdrowia psychicznego. Promocja zdrowia jest ide Promocja zdrowia w SP3. Program Profilaktyki Szko. PROGRAM WYCHOWAWCZY SZKO. Promocja zdrowia i edukacja zdrowotna. Szkolny program profilaktyki do realizacji w gimnazjum i szko SZKOLNY PROGRAM PROFILAKTYKI I PROMOCJI ZDROWIA. Promocja Zdrowia w Przedszkolu . Program Edukacji Zdrowotnej. Organizowanie wzorcowego . Wprowadzenie zasad higieny pracy i . Oczekiwane efekty: dobre samopoczucie dzieckazaspokojenie codziennych potrzeb dziecka, a co za tym idzie, dbania o dobre samopoczucie doros. Zapewnienie wystarczaj. Pobudzenie poczucia jego w. Organizowanie zabaw nie zagra. DBANIE O ZDROWIE SWOJE I INNYCHObszary edukacyjne –tre. Uzyskane wyniki ewaluacji b. Program edukacji przedszkolnej dla dzieci w wieku od 3 do 6 lat, warszawa 2. |
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