Java 14 support in Eclipse IDE
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The document provides an overview of using Java 14 features in the Eclipse IDE 2020-06, including activating Java 14 and enabling preview features, creating and using records, formatting text blocks, handling switch expressions, and utilizing instanceof pattern matching. It describes specific steps for configuring features, utilizing quick fixes, and modifying settings within the IDE. Additionally, it highlights new functionalities such as text blocks and the support for switch expressions as standard features.
Java 14 support in Eclipse IDE
- 1. Eclipse IDE 2020‑06 Eclipse IDE Java™ 14 Support Overview Here’s a brief overview of how to use some of the main Java 14 features in the Eclipse IDE 2020-06 release. Activating Java 14 and Enabling Preview Features To start using Java 14 in the Eclipse IDE 2020-06 release, choose Preferences > Java > Installed JREs, then select the Java 14 Java Development Kit (JDK), as shown below. To set the JDK compliance to 14 and enable the preview features, choose Preferences > Java > Compiler, then select the options shown below. When a preview feature is used in the code, the compiler provides a default warning that the preview feature may not be supported in a future release. You can ignore the warning or set it to Info by changing its severity level on the page shown above. To quickly enable the preview features on an existing Java project, right-click on it in the Package/Project Explorer and select Configure > Enable preview features, as shown below. ______________________________________________________________________ www.eclipse.org/eclipseide
- 2. Eclipse IDE 2020‑06 Creating and Using Records Java 14 introduces records as a new preview feature. To create a record in the Eclipse IDE, use the new_record template in an empty .java file, as shown below. If preview is not already enabled, you can enable preview features and use the record through the quick fixes that are provided. Press Ctrl + 1 to access quick fixes. You can also create a record using the New > Record wizard, shown below. The wizard provides additional options, such as selecting the visibility modifier and adding the interfaces the record implements. You can run a Java program using the record to verify that the record instance is provided with auto-generated constructor, component accessor, toString, equals, and hashcode methods, as shown below. ______________________________________________________________________ www.eclipse.org/eclipseide
- 3. Eclipse IDE 2020‑06 You can also perform the rename refactoring on record components and update the accessor method names along with component references, as shown below. In addition, several new settings have been added to the formatter profile to control record formatting. Use the filter, shown below, to quickly view these configurable settings. ______________________________________________________________________ www.eclipse.org/eclipseide
- 4. Eclipse IDE 2020‑06 Creating and Formatting Text Blocks Text blocks received a second round of preview in Java 14. You can create a text block by enclosing it in triple quotes. The Eclipse IDE makes it easier to add these delimiters with the new keyboard shortcut Ctrl + Shift + ' (apostrophe). You can also select an existing text block and use this key binding to quickly enclose it in text block delimiters, as shown below. ______________________________________________________________________ www.eclipse.org/eclipseide
- 5. Eclipse IDE 2020‑06 Use the formatter profile to configure text block indentation, as shown below. Handling Switch Expressions Java 14 has promoted switch expressions to a standard feature. The Eclipse IDE provides many quick fixes, quick assists, templates, and tooling features to help you write code with switch improvements. For example, there are quick fixes (Ctrl + 1) to add the ‘default’ case or the missing case statements in a switch expression where the proposals are inserted in linked mode so you can quickly replace them with the required values. A quick assist (Ctrl + 1) allows you to split multiple labels in a single case statement so you can provide separate case values when needed. In addition, the formatter profile, shown below, has new settings that allow you to control spaces at various locations in switch expressions. ______________________________________________________________________ www.eclipse.org/eclipseide
- 6. Eclipse IDE 2020‑06 Using instanceof Pattern Matching Java 14 introduces pattern matching for instanceof as a preview feature that provides a pattern variable with the instanceof operator to simplify the code by reducing explicit casts. The Eclipse IDE understands the type and scope of the pattern variable, allowing you to perform actions, such as invoking the content assist (Ctrl + Space) and renaming the pattern variable, as shown below. ______________________________________________________________________ www.eclipse.org/eclipseide