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Reducing the weight of our footer. Linked 9. Related Hot Network Questions. Question feed. Stack Overflow works best with JavaScript enabled. Careful here, ensure you have committed the latest version of your code so that you can revert any automatic change you dislike. You can improve this with type filters in the preference.
Type filter allow you to ignore certain packages. Eclipse has the option to perform batch cleanup on existing code. This includes simple thinks like the removal of trailing whitespace, the additional of missing annotations but also advanced cleanups like the conversion of code to Java lambda expressions. The cleanups contain also lots of options to improve the performance of your code.
This chapter lists other useful Eclipse settings which are not directly related to Java development. It also explains how to export and import your preference settings from one workspace to another. The Default button in this preference dialog allows you to set the default editor for a certain file extension. This edit is used by default, if you open a new file with this extension. The other configured editors can be selected if you right-click on a file and by selecting Open With. In the sub-menu you see the available editors.
The available editors depend on your Eclipse installation. Eclipse remembers the last editor used to open a file. It uses this editor again the next time you open the file. You can export your preference settings from one workspace via File Export General Preferences.
Eclipse does allow you to export some preference settings separately, but for most of them you have to select the Export all flag. Similarly, you can import them again into another workspace via File Import General Preferences.
You can also configure certain preference settings on a per project basis. To do this, select your project, right-click on it and select Properties. For example, on the Java Editor Save Actions you can select the Enable project specific settings checkbox to configure the save action for the current project only. This creates a. You can add this folder to your version control system to ensure that every developer uses the same setting.
You could define a template which creates the method body for you. Eclipse allows you also to specify the settings for formatting the source code. These rules are used by Eclipse if you automatically format your source code. Press the New button to create a new set of formatting rules or press the Edit button to adjust an existing profile.
You can set the code formatter specific for a project via Right-click on the project Properties. This way you can ensure that everyone is using the same formatter while working on this project. Eclipse can generate source code automatically. In several cases comments are added to the source code. In the code tree you have the templates.
Select, for example, menu:Code [Method Body] and press the Edit button to edit this template and to remove the "todo" comment.
Your Eclipse installation contains a file called eclipse. For example, the -Xmx parameter can be used to define how large the Java heap size can get. The following listing shows an example eclipse. The parameters after -vmargs configure the Java virtual machine. On a modern machine with at least 8 Gigabyte available memory assigning MB or more to the Java virtual machine is a good practice to run Eclipse faster.
You can in additional also turn of class verification in the JVM. This avoids that the JVM checks if the class data which are loaded is not corrupt or invalid.
To disable this check add the -Xverify:none option option on your JVM. Eclipse allows you to configure it via startup parameters. This requires that you start Eclipse from the command line or that you configure your launcher links to include these parameters. Enables the display of the current workspace directory in the header of the running IDE. Eclipse keeps a local history of files which have changed. Every time an editable file is saved, the Eclipse runtime updates the local history of that file and logs the changes that have been made.
This local history can then be accessed and used to revert the file changes or to compare against a previous version. Eclipse opens the History view. If you double-click on an older version of the file, the Compare view shows the differences as depicted in the following screenshot.
You can replace files based on the local history. You will create more and more projects in your development career. Therefore, the data in your workspace grows and it is hard to find the right information. The Eclipse IDE allows you to organize your project into working sets so that you can hide certain resources.
On the next dialog select Resource , press the Next button. Select the projects you would like to see and give it a name. You can now filter the displayed files in the Package Explorer based on the created working set. You can also use the working set to structure your projects in your workspace. For this, select Working Sets from the context menu of the Package Explorer view. This indicates a task for Eclipse.
You find those in the Task view of Eclipse. Via double-clicking on the task, you can navigate to the corresponding code.
You can open this view via Window Show View Tasks. Close the editor for the MyFirstClass class. This will start a new window which shows you the help topics for your currently installed components. The online help is version-dependent and contains the help for all Eclipse projects of the simultaneous release. The Eclipse webpage also contains a list of relevant resources about Eclipse and Eclipse programming.
You find these resources under the following link: Eclipse resources and Eclipse corner wiki. Due to the complexity and extensibility of Eclipse, you will need additional resources to help you solve your specific problems. Fortunately, the web contains several resources which can help you with your Eclipse problems. Currently, the best places to find, ask and answer questions are the Eclipse forums and Stack Overflow.
Try to stay polite with your postings, as the Eclipse community values polite behavior. The Eclipse forums offer several topic-specific forums in which you can post and answer questions. To post or to answer questions in the Eclipse forums, you need a valid user account in the Eclipse bug tracker. Stack Overflow also requires a user account and its community is very active. Stack Overflow allows to tag questions with the relevant keyword, e. Ensure that you search the forums and mailing lists for solutions for your problem.
Somebody else might has asked the same question earlier and the answer is already available. If you encounter a problem with the Eclipse IDE or think about a potential improvement for it, you should report this to the Eclipse project. The Eclipse bug and feature tracker is using the open source Bugzilla project from Mozilla. In this system, you enter Eclipse error reports. You can also request new features or improvements of existing features.
This bug tracker can be found under Eclipse Bugzilla. Here you can search for existing bugs and review them. To participate actively in the Eclipse bug tracker, you need to create a new account.
This can be done by clicking the Create a New Account link. Once you have a user account, you can login to the Eclipse bug tracker. This allows you to comment on existing bugs and report new ones.
The user data for the all Eclipse sites are the same, i. Only for the Gerrit access, different user data is used. As example you can report bugs for the Eclipse platform via the following link: Bug report for the Eclipse platform.
The Eclipse Bugzilla system allows you and the Eclipse committer to enter the bug priority. But overall, it is up to each project do decide how they handle bugs so some variation from project to project will occur. The following rules can be used as guideline.
The bug blocks development or testing of the build and no workaround is known. This is the default value for new bug reports. Implies some loss of functionality under specific circumstances, typically the correct setting unless one of the other levels fit.
Represents a request for enhancement also for "major" features that would be really nice to have. In this exercise you use the Bugzilla system to review some of the Eclipse platform bugs. No action is excepted from you, but if you find an updated bug, you should update the bug report and describe that the problem is solved. This exercise uses the Eclipse platform as example but you can use any Eclipse project of your choice.
Open to Eclipse Bugzilla and select the Search button. In most cases Eclipse project have tons of unsolved bugs. If you are looking for existing software bugs, it is recommended to look at the latest bugs, e.
Eclipse Forum for asking questions and providing feedback. Eclipse Bug Tracker for reporting errors or feature requests. If you need more assistance we offer Online Training and Onsite training as well as consulting. Learn more in the Learning Portal. What to do if the Eclipse IDE does not start.
Appearance By default, Eclipse ships in a light configuration, if you prefer you can switch to a dark theme via Window Preferences General Appearance menu. Important Eclipse terminology 4. Workspace and projects The workspace is the physical location file path for storing meta-data and optional your development artifacts. Overview of the user interface Eclipse provides views and editors to navigate and change content. A view is typically used to display structured data and allow to modify it directly.
Eclipse projects An Eclipse project contains source, configuration and binary files related to a certain task. The Eclipse Java perspective The following description is a small introduction into important elements of the Java perspective. Package Explorer view The Package Explorer view allows you to browse the structure of your projects and to open files in an editor via a double-click on the file.
Outline view The Outline view shows the structure of the currently selected source file. Problems view The Problems view shows errors and warning messages. Javadoc view The Javadoc view shows the documentation of the selected element in the Java editor. Java editor The Java editor is used to modify the Java source code.
Create project Select File New Java project from the menu. Create package A good naming convention is to use the same name for the top level package and the project. Run your application code from the IDE Now run your code. Eclipse will run your Java program. You should see the output in the Console view. Run Java program outside Eclipse 7. Select your project, right-click it and select the Export menu entry. Run your program outside Eclipse Open a command shell, e. Exercise: Java project, packages and import statements 8.
Create project Create a new Java project called com. Exporting and importing projects 9. Exporting projects You can export and import Eclipse projects. Exercise: Export and import projects Export your one of your projects into a zip file.
Source navigation in the Eclipse IDE Package Explorer or Project Explorer The primary way of navigating through your project is the Package Explorer or alternatively the Project Explorer view. Link Package Explorer with editor The Package Explorer view allows you to display the associated file from the currently selected editor. Opening a class You can navigate between the classes in your project via the Package Explorer view as described before.
You only need to specify part of each segment of the package name. Assume, for example, that you search for the org.
Button class. To find this class, you can use the search term org. Button or o. To avoid suffix matching, you can add a space after the class name.
For example, you can type Selection there is a space after selection to match the Selection class but not the SelectionListener class. Open Resource dialog to open arbitrary files You can open any file from your open projects via the Open Resource dialog.
Quick Outline Quick Outline shows you an structured overview of the file you are editing. Open Type Hierarchy The type hierarchy of a class shows you which classes it extends and which interfaces it implements. Full text search You frequently need to find files containing certain text or other meta data. Annotation navigations You can also navigate via the annotation buttons, e.
Mouse and keyboard navigation In a lot of cases you can also use the mouse to navigate to or into an element if you press the Ctrl key.
Show in Breadcrumb You can also activate the breadcrumb mode for the Java editor which allows you to navigate the source code directly from the Java editor. To hide it again, right-click on a breadcrump entry and select Hide Breadcrumb. Shortcuts There are a lot of shortcuts available for navigation. Closing and opening projects Closing projects saves memory in Eclipse and can reduce the build time. To open a closed project double-click on it, or right-click it and select Open Project.
Content Assist and Quick Fix Content assist Content assist is a functionality in Eclipse which allows the developer to get context-sensitive code completion in an editor upon user request. Quick Fix Whenever Eclipse detects a problem, it will underline the problematic text in the editor. Exercise: Convert anonymous inner classes to lambda expressions and vice versa The Eclipse IDE has full support for modern Java versions.
You can use a quick fix for the conversion as demonstrated via the following screenshots. Generating code Eclipse has several possibilities to generate code for you.
Exercise: code generation and content assists Introduction In this exercise you practice the usage of code generation and the usage of the Content Assists functionality. Create project Create a project called com. Create class Create the com. Create instances Create a new class called TodoProvider.
ArrayList ; import java. Date ; import java. Write a test class Write another TodoProviderTest class with a public static void main String[] args method. Example implementation of TodoProviderTest While this exercise was about code generation and content assists, you might be interested in a potential solution for this exercise. Refactoring This section covers the refactoring facilities of Eclipse which allow you to improve the structure of your source code.
Refactoring Refactoring is the process of restructuring the code without changing its behavior. Refactoring in Eclipse Eclipse supports several refactoring activities, for example, renaming or moving. Exercise: Refactoring Preparation For the next examples change the MyFirstClass class to the following code. Extract method A useful refactoring is to mark code and create a method from the selected code.
After this refactoring the class should look like the following code. Extract Constant You can also extract strings and create constants based on the strings.
Using JARs libraries in Eclipse Adding a Java library to the project classpath You can store JAR files directly in your project, and add them to the classpath which the Java compiler of Eclipse is using. Outside Eclipse you still need to configure your classpath for your project. Using project dependencies You can define in Eclipse that a project is dependent on another project.
Attach source code to a Java library You can open any class by positioning the cursor on the class in an editor and pressing F3. If the source code is not available, the editor shows the bytecode of that class.
Attaching the source code to a library also allows you to debug this source code. In the Location path field, enter the path of an archive or a folder containing the source. Add Javadoc to a Java library It is also possible to add Javadoc to a library which you use.
Updates and installation of plug-ins Performing an update If you are behind a network proxy, you have to configure your proxy via the Window Preferences General Network Connection preference setting. Release specific update site , e. If you select a valid update site, Eclipse allows you to select components and install them.
Restarting Eclipse After an update or an installation of a new software component, you should restart Eclipse to make sure that the changes are applied. Eclipse Marketplace Using the Marketplace client Eclipse contains a client which allows installing software components from the Eclipse marketplace. Maintaining your Favorites The marketplace client allows to install your favorite plug-ins directy. Advanced Eclipse Update manager options Manual installation of plug-ins dropins folder Eclipse plug-ins are distributed as jar files.
Exporting and importing the installed components Eclipse allows you to export a file which describes the installed Eclipse components.
Installing features via the command line The Eclipse update manager has a component called director which allows you to install new features via the command line.
Eclipse preference settings What are preferences? Opening the preference dialog Select Window Preferences to open the preference dialog. You link to this file via your eclipse. Then, type CMD and select Run , as shown below. Select OK, and you will see the command prompt window. Here, type in java -version and press the enter key. This step will show you the current version of Java installed in your local Windows OS as shown below.
Eclipse IDE is available in a few different versions. I'll mention some of the more popular versions of Eclipse IDE:. On the next page, you can see a link to the installer file on the right side of the screen. It looks something like this.
Click on the Download button. It will take you to the next page where you can download the installer by pressing the Download button again. After the installer starts, it will ask you for the type of Eclipse IDE you require. After selecting the required IDE type, you can see the following screen where you can set up your application installation location.
I have chosen the C Drive. After that, just press install and your software will start installing into your system. Just press the Launch button if you wish to start with IDE right away. You will now see the Eclipse IDE getting booted up.
Next, you need to set up a separate folder for your workspace. Eclipse will select a default workspace for you. Either you can continue with the default or create your workspace location and then click on the launch button. Next, we will take a tour of Eclipse IDE so that we can better understand its usage and functionality. Hence, it is available when the code editor is active.
You can debug, run, and fix the code by setting breakpoints through run. The view can be opened by navigating to the window menu and then to "show view" as described in the image. To locate and activate a view, you can move to the window button, then to show , and lastly, press the other button. This procedure provides the user with locating and activating functionalities. In Java, you can open multiple perspectives, but you will be confined to using just one perspective at one time. The project name is at the top, followed by the package, and finally at the bottom we have the class.
Creating a Java project is simple. You can create a new project by following the procedure below. Then you can see a new dialog box on the screen where you can name your project and add some credentials to it. Similar to creating a new project, creating a new package is simple as well.
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