Eclipse IDE Tutorial. To start Eclipse, double-click on the (Microsoft Windows) or eclipse (Linux / Mac) file in the directory where you unpacked. which is both the leading Java™ integrated development environment (IDE) and the the Eclipse Platform contains the functionality required to build an IDE. Eclipse IDE Keybindings. General. Ctrl+3. +3. Go to quick access search for available views, actions, wizards, menus and more. Alt+ +Q Q. + +Q Q.

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Ganymede) of the Eclipse IDE for Java. Developers has been installed on GL. – From any of the Linux machines in the labs simply run the command eclipse. Java application development is supported by many different tools. One of the most powerful and helpful tool is the free Eclipse IDE (IDE = Integrated. This tutorial will teach you how to use Eclipse in your dayday life while We assume you are going to use Eclipse IDE to handle all levels of Java projects.

Learn more about the Project Archetype. This step might take a while since m2eclipse needs to scan the archetype catalogs. Choose com. Fill in a Name, Group id and an Artifact id for the sample project.

You can also opt to set some advanced properties. You should then configure an AEM server to which Eclipse will connect. The project structure is created. Note: On a fresh installation more specifically: when maven dependencies have never been downloaded you might get the project created with errors. In this case please follow the procedure describe in Resolving Invalid Project Definition. Troubleshooting To resolve invalid dependencies and project definition proceed as follows: Select all created projects.

Run the Tester class and validate that your implementation is correct.

The Tester class checks for an example value but the method should work for different input values. You can export and import Eclipse projects. This allows you to share projects with other people and to import existing projects. You can import from an archive file, i. Export your one of your projects into a zip file.

Switch into a new workspace and import the project into your new workspace based on the zip file you exported. The primary way of navigating through your project is the Package Explorer or alternatively the Project Explorer view.

You can open nodes in the tree and open a file in an editor by double-clicking on the corresponding entry in the tree hierarchy. The drop-down menu in the Package Explorer allows you to filter the resources which should be displayed or hidden. The Package Explorer view allows you to display the associated file from the currently selected editor. For example, if you are working on the Foo. To activate this behavior, press the Link with Editor button in the Package explorer view as depicted in the following screenshot.

You can navigate between the classes in your project via the Package Explorer view as described before. You can navigate the tree and open a file via a double-click. In addition, you can open any class by positioning the cursor on the class in an editor and pressing F3. This shows the following dialog in which you can enter the class name to open it.

You can also search for package names. Each part of the package name must end with a.

You can open any file from your open projects via the Open Resource dialog. This dialog allows to enter the file name and to open or show it in a selected view. The following screenshot demonstrate the usage to open a pom.

Quick Outline shows you an structured overview of the file you are editing. For example, for a Java class you see its methods with the option to filter.

You can also reach this option, via right-click in an editor via the Quick Outline option. By default, Quick Outline shows only the direct members and fields of the Java class. The default look of the Quick Outline option is similar to the Quick Outline view of the Java perspective.

The type hierarchy of a class shows you which classes it extends and which interfaces it implements. You can use the type hierarchy to navigate to one of these elements.

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To open the type hierarchy of the selected class, right-click in the editor and select Open Type Hierarchy Shortcut: F4 or Quick Type Hierarchy Shortcut: You frequently need to find files containing certain text or other meta data. Use the File Search tab to search for text with the option to use regular expressions and also to replace matching entries. Eclipse associates file extensions with the default tab.

You can customize the available search tabs via the Customize button in the Search dialog. Via the Remember the last used page you can configure Eclipse to use your last tab as default. For example, use the Java Search tab to search for Java elements, e.

The Search view shows the search results for the selected scope.

Step 4: How to import files into an Eclipse Project

You can double-click on a search entry to navigate to the corresponding position in the editor. The currently selected search result is also indicated via an arrow in the left border of the editor. This allows you to search in the current active editor for a text which is displayed in the status line as depicted by the following screenshot. The advantage of this search is that no pop-up dialog is opened which blocks other elements in the Eclipse IDE.

You can also navigate via the annotation buttons, e. By pressing the buttons you can navigate to the related annotations. The following screenshot shows source code with two warnings and one error and you can navigate between the corresponding code via the annotation buttons. Which annotations are relevant for navigation can be configured via the drop-down menu of the toolbar. This selection is highlighted in the following screenshot.

In a lot of cases you can also use the mouse to navigate to or into an element if you press the Ctrl key. For example, press the Ctrl key and left click with the mouse on the name of a class to jump into the class declaration.

Similar to the left mouse click combined with the Ctrl , you can use the F3 key to go into a class. You can also activate the breadcrumb mode for the Java editor which allows you to navigate the source code directly from the Java editor. You can activate this mode via right-click in the editor and by selecting the Show in Breadcrumb entry. This allows you to navigate the source code from the editor as depicted in the following screenshot. There are a lot of shortcuts available for navigation. Closing projects saves memory in Eclipse and can reduce the build time.

Eclipse ignores closed projects, e. Also the Problems view does only shows errors of opened projects. This typically helps you focus your attention on the project. You can close projects via a right-click on it and by selecting the Close Project menu entry. Alternatively, if you work on a project, you can close all unrelated projects via a right-click on it and by selecting the Close Unrelated Projects menu entry.

You can use the filter functionality for the Package Explorer view to hide the closed projects. Content assist is a functionality in Eclipse which allows the developer to get context-sensitive code completion in an editor upon user request.

This will replace syso with System. If you have a reference to an object, for example, the object person of the type Person and need to see its methods, type person. Whenever Eclipse detects a problem, it will underline the problematic text in the editor. This functionality is called Quick Fix. Eclipse will suggest creating a field or local variable. Quick Fix is extremely powerful. For example, it allows you to create new local variables and fields as well as new methods and new classes.

It can also assign a statement to a variable and much more. Quick Fix also gives several options for code changes on code which does not contain errors, e. You can use content assists, quick fixes and refactoring for Java 8. This section demonstrates the quick fix for converting anonymous inner classes to lambda expressions.

Eclipse has several possibilities to generate code for you. This can save significant time during development. For example, Eclipse can override methods from superclasses and generate the toString , hashcode and equals methods. It can also generate getter and setter methods for attributes of your Java class.

To test the source generation, create the following class in your com. In this exercise you practice the usage of code generation and the usage of the Content Assists functionality. Use Eclipse to generate a toString method for the Todo class based on the id and summary field. Also generate a hashCode and equals method based on the id field.

Create a new class called TodoProvider. Create the following static method in your TodoProvider class. Write another TodoProviderTest class with a public static void main String[] args method. In your main method call the createInitialModel method and validate that the returned number of items is 5.

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If another number than 5 is returned, throw a RuntimeException. If the correct number is returned, write the String "Correct" to the Console view. Use Content assist to create the System.

While this exercise was about code generation and content assists, you might be interested in a potential solution for this exercise. The following listing contains a potential solution. This section covers the refactoring facilities of Eclipse which allow you to improve the structure of your source code. Refactoring is the process of restructuring the code without changing its behavior. For example, renaming a Java class or method is a refactoring activity. Eclipse will make sure that all calls in your Workspace to your class or method are renamed.

The following screenshot shows how to call the Rename refactoring for a class. The cursor is positioned on the class and the context menu is activated via a right-click on the class. Gives magic numbers or hard-coded strings a descriptive constant name and replaces all occurences. Eclipse has many more refactorings. The available options depend on the selection in the Java editor. In most cases you should get an idea of the performed action by the naming of the refactoring operation.

A useful refactoring is to mark code and create a method from the selected code. Use calculateSum as the name of the new method. You can also extract strings and create constants based on the strings. Mark for this example the "Hello Eclipse!

Eclipse provides a lot of shortcuts to work efficiently with the IDE. For a list of the most important Eclipse shortcuts please see https: You can store JAR files directly in your project, and add them to the classpath which the Java compiler of Eclipse is using. To manage the classpath for your Eclipse, right-click on your project and select Properties.

JAR files can be stored outside your project or inside. Select the Java library you want to import and select the folder, e. Alternatively, to the import approach via the menu, you can copy and paste the jar file into a folder. You can define in Eclipse that a project is dependent on another project.

If you do this, you can use its classes in the project defining the dependency. To do this select your project, right-click on it and select Properties. Select Java Build Path and the Projects tab. This only works within Eclipse, it allows you to develop several projects which will later be exported as JAR files together. Outside of Eclipse you need to create Java libraries for the projects and add them to the classpath. You can open any class by positioning the cursor on the class in an editor and pressing F3.

This shows a dialog in which you can enter the class name to open it. This happens, for example, if you open a class from a the standard Java library without attaching the source code to it. To see the source code of such a class, you can attach a source archive or source folder to a Java library.

Afterwards, the editor shows the source instead of the bytecode. The following screenshot shows this setting for the standard Java library.

The file is typically called src. It is also possible to add Javadoc to a library which you use. For this you need to have the Javadoc somewhere in your filesystem. The Eclipse IDE contains a software component called Update Manager which allows you to install and update software components.

Installable software components are features or plug-ins. These features are located in update sites or software sites. An update site contains installable software components and additional configuration files.

It can be located in various places, e. The configuration files provide aggregated information about the software components in the update site. The update functionality in Eclipse uses this information to determine which software components are available in which version.

This allows the Eclipse update functionality to download only components which are new or updated. The system searches for updates of the already installed software components.

If it finds updated components, it will ask you to approve the update. From the Work with list, select or enter a URL from which you would like to install new software components.

If you select a valid update site, Eclipse allows you to install the available components. Check the components which you want to install.

If they are not categorized, they will not be displayed, unless the grouping is disabled. After an update or an installation of a new software component, you should restart Eclipse to make sure that the changes are applied. Eclipse also contains a client which allows installing software components from the Eclipse Marketplace client.

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The advantage of this client is that you can search for components, discover popular extensions and see descriptions and ratings. Compared to the update manager, you do not have to know the URL for the software site which contains the installable software components. Most Eclipse distributions contain the Marketplace client by default. You may need to install the Marketplace client software component into Eclipse before you can use it. You can use the Find box to search for components.

Pressing the Install button starts the installation process. The marketplace client allows to install your favorite plug-ins directy. For this, go to the Eclipse Marketplace website and login with your Eclipse.

Afterwards, select the Favorites tab in the Eclipse Marketplace client and login to be able to install your favorites. Eclipse plug-ins are distributed as jar files. If you want to use an Eclipse plug-in directly or do not know the update site for it, you can place it in the dropins folder of your Eclipse installation directory.

Eclipse monitors this directory and during a re- start of your IDE, the Eclipse update manager installs and removes plug-in based on the files contained in this directory. You should not modify the content of the Eclipse plugins directory directly.

If you want to install plug-ins, put them into the dropins folder. If you want to remove it, delete the JAR from this folder. Plug-ins are typically distributed as jar files. To add a plug-in to your Eclipse installation, put the plug-in. Eclipse should detect the new plug-in and install it for you.

If you remove plug-ins from the dropins folder and restart Eclipse, these plug-ins are automatically removed from your Eclipse installation. Eclipse allows you to export a file which describes the installed Eclipse components. During the export the user can select which components should be included into this description file. Other users can import this description file into their Eclipse installation and install the components based on this file. Select the components which should be included in your description file.

The wizard allows you to specify the components which should be installed. The Eclipse update manager has a component called director which allows you to install new features via the command line.

You need to start this command in the command line and it assumes that you are in a directory which contains your Eclipse installation in a folder called eclipse. The feature names which you need for this operation can be seen on the second page of the standard installation dialog of the Eclipse update manager. The behavior of the Eclipse IDE can be controlled via key value pairs stores as preference settings. Each Eclipse software component can define such perferences and use the values to configure itself.

This allows you for example to configure how long the Eclipse waits before the code completion or if the import statements in your source code should be automatically adjusted if you save your source code. Which preferences are key values stored on the file system, the Eclipse IDE allows the user to configure most of these values via the preference dialog.

You can use the filter box to search for specific settings. Correctly configuring Eclipse to your needs can largely improve your productivity. Most of these preference settings are specific to your workspace but some are also valid for all workspaces.

In this file you enter default values for preference settings. For example, the following will setup a default type filter for the java. The following example eclipse. To identify a key for a certain preference setting you can export existing preference settings via the following approach. The Eclipse IDE is relatively conservative configured to avoid surprises during development.

Certain settings in the Eclipse IDE allow you to use it more efficiently. If you find a setting in this exercise not working for you, you can always skip that setting. There is not a single correct setting for everyone in the world. You can synchronize the currently selected Java editor with the selection in the Project Explorer or the Package Explorer view. This gives you a clearer visibility which object you are currently editing.

Eclipse can make typing more efficient by placing semicolons at the correct position in your source code. In the Automatically insert at correct position selection enable the Semicolons checkbox. Afterwards, you can type a semicolon in the middle of your code and Eclipse positions it at the end of the current statement.

Eclipse allows you to escape text automatically if it is pasted into a String literal. Eclipse would escape the text automatically for you. Now you can paste text that should be escaped. The following code snippet shows an example for the resulting code if you paste HTML code containing a link into a string literal.

You can configure Eclipse to highlight the matching brackets of a code block in the source code editor. Before the change you would not see the enclosing brackets. Afterwards, they will be slightly highlighted. This helps to see in which block you are.

By default, Eclipse determines if the currently selected file is executable and try to start that. This is sometimes confusing.

You can configure the Eclipse IDE to always start the last started program. To add import statements to your code, you can use the Organize Imports action shortcut: If there are several alternatives, Eclipse suggests all available packages and the user has to select the right one. The Save Actions setting can automatically organize import statements. It adds import statements automatically if there is only one possible import and removes unused ones. The following shows the available packages for the List class in the Organize Imports dialog.

The setting in the following screenshot excludes the java. Please note that Eclipse shows in its default configuration only the packages that are used in the current workspace. If you want to exclude standard Java packages, you have to create at least one Java project.

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Eclipse can perform actions during the save operation shortcut: Select that the source code should be formated and that the imports should be organized at every save action. Import statements are only automatically created if where is one valid import. If Eclipse determines more than one valid import, it will not add import statements automatically.

You can improve this with Filtering out certain Java packages via Type filters , as this reduces the list of possible imports. You can also define the additional actions which are performed during save. Eclipse can override existing method calls, in case you trigger a code completion in an existing statement. Eclipse can also try to guess the correct actual parameters for a method call.

Due to Bug this setting is not usable at the moment. The Eclipse IDE is configured to give you automatic code completion suggestion only after the. YOu can configure Eclipse to get code completion on every character.

Some user prefer a dark styled IDE. The appearance of Eclipse can be configured. By default, Eclipse ships with a few themes but Eclipse also provides a dark theme. The Theme selection allows you to switch to the Dark theme of Eclipse. Workspace The workspace is the physical location file path you are storing certain meta-data and optional your development artifacts. Your projects, source files, images and other artifacts can be stored inside or outside your workspace.

The meta-data stored for the workspace contains preferences settings, plug-in specific meta data, logs etc. You typically use different workspaces if you require different settings or if you want to divide your work. It is not mandatory that a project resides within the workspace directory. It is possible to refer to external resources e. Views and editors Eclipse provides views and editors to navigate and change content. View and editors can be grouped into perspectives.

A view is typically used to work on a set of data. This data might be a hierarchical structure. If data is changed via the view, the underlying data is directly changed, without the need to save. For example, the Project Explorer view allows you to browse and modify files of Eclipse projects. Any change in the Project Explorer is directly applied to the files, e. Editors are typically used to modify a single data element, e. Change in an editor are only applied once the user saves. For example, the Java editor is used to modify Java source files.

Changes to the source file are applied once the user selects the Save button. A editor with changed data a dirty editor is marked with an asterisk left to the name of the modified file. Eclipse projects An Eclipse project contains source, configuration and binary files related to a certain task.Before we write the code, you need to know how to take input from the user. However, it is also possible to define alternative Node.

The entry points to tweak Run Configurations are. This will appear in the Help menu as 'Eclipse Marketplace You can select multiple strategies for export.

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