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Editorial Reviews. About the Author. Atul Palandurkar. Atul Palandurkar is a Java and Android Instant NetBeans IDE How-to by [Palandurkar, Atul].
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Prev Next. In the example on the left, the editor suggests inserting the LinkedHashMap constructor from the java. If the "smart" suggestions are not the ones you want to use, press Ctr-Space again to see a complete list. Use code completion Ctr-Space to complete keywords in your code.


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The editor analyzes the context and suggests the most relevant keywords. You can quickly add the keyword extends from the suggested items. When you are adding a new field or a variable, use code completion Ctr-Space to choose a name that matches its type. Type a prefix for the new name, press Ctr-Space and select the name you want to use from the list of suggestions. The editor guesses on the parameters for variables, methods, or fields and displays the suggestions in a pop-up box. For example, when you select a method from the code completion window which has one or more arguments, the Editor highlights the first argument and displays a tooltip suggesting the format for this argument.

To move to the next argument, press the Tab or Enter keys. You can use the Tab key to quickly fill in the most commonly used prefixes and single suggestions. In the code completion window, icons are used to distinguish different members of the Java language.

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See Appendix A at the end of this document to see the meanings of these icons. There are several ways of how you can work with import statements. The IDE's Java Editor constantly checks your code for the correct use of import statements and immediately warns you when non-imported classes or unused import statements are detected.

When a non-imported class is found, the error mark appears in the IDE's lefthand margin this margin is also called the glyph margin. Click the error mark and choose whether to add the missing import or create this class in the current package. When you select a class from the code completion window, the Editor automatically adds an import statement for it, so you do not need to worry about this. If there are unused import statements in your code, press the warning mark in the Editor lefthand margin and choose either to remove one unused import or all unused imports.

In the Editor, unused imports are underlined see the Semantic Coloring section for details. To quickly see if your code contains unused or missing imports, watch the error stripes in the righthand margin: orange stripes mark missing or unused imports. When working in the Java Editor, you can generate pieces of code in one of the two ways: by using code completion or from the Code Generation dialog box.

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Let's take a closer look at simple examples of automatic code generation. The suggested list is adjusted to the current context.

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In the example on the left, we are going to generate a constructor for the Sample class. Press Alt-Insert , select Constructor from the Code Generation box, and specify the fields that will be initialized by the constructor. The Editor will generate the constructor with the specified parameters.

In the IDE's Java Editor, you can automatically generate various constructs and whole methods, override and delegate methods, add properties and more. You can also generate code from the code completion window. In this example, we use the same piece of code as above to show how you can generate code from the code completion window. Press Ctrl-Space to open the code completion window and choose the following item: Sample String name, int number - generate. The Editor generates a constructor with the specified parameters. In the code completion window, the constructors that can be automatically generated are marked with the icon and the " generate " note.

For more explanations of the icons and their meanings, see Appendix A. A Code Template is a predefined piece of code that has an abbreviation associated with it. See the examples below that show how you can use code templates. Code templates are marked with the icon in the code completion window. In the expanded template, editable parts are displayed as blue boxes.

Use the Tab key to go through the parts that you need to edit.


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See this document to know more about the syntax for writing new Code Templates. The Javadoc for this element is displayed in a popup window. The IDE creates a skeletal structure for a Javadoc comment filled with some content. If you have a Javadoc window open, you will see the changes immediately while you are typing. Type the " " symbol and wait until the code completion window opens depending on your settings, you may need to press Ctr-Space.

The IDE will generate the Javadoc and open it in a separate browser window. In the example on the left, you can see a sample output of the Generate Javadoc command. If there are some warnings or errors, they are also displayed in this window.

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To customize Javadoc formatting options, right-click the project, choose Properties and open the Documenting panel under the Build category available on Java projects only. For information about the options on this panel, click the Help button in this window. To identify the places in your code that need Javadoc comments and quickly insert these comments, you can use the Javadoc Analyzer tool available in the Java Editor. While you are typing, the Java Editor checks your code and provides suggestions of how you can fix errors and navigate through code.

The examples below show the types of hints that are available in the Editor and how to customize them.

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For the most common coding mistakes, you can see hints in the lefthand margin of the Editor. The hints are shown for many types of errors, such as missing field and variable definitions, problems with imports, braces, and other. Click the hint icon and select the fix to add. Hints are displayed automatically by default. The editor detects that this valiable is not defined. Click the hint icon and see that the Editor suggests that you create a field, a method parameter, or a local variable. Note: On the Hints tab, you can also disable or limit the scope of dependency scans Dependency Scanning option.

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These steps can singificantly improve the performance of the IDE. The IDE detects compilation errors in your Java sources by locating and recompiling classes that depend on the file that you are modifying even if these dependencies are in the files that are not opened in the editor. When a compilation error is found, red badges are added to source file, package, or project nodes. Dependency scanning within projects can be resource consuming and degrade performance, especially if you are working with large projects. Select a block in your code that you want to surround with a statement and click the bulb icon in the lefthand margin or press Alt-Enter.

The editor displays a list of suggestions from which you select the statement you need.