Project Lombok!
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The document discusses the challenges associated with boilerplate code in the industry, including syntax verbosity and non-standardization, highlighting human errors and the repetitive nature of defining getters and setters. It introduces Project Lombok, which simplifies code through annotations such as @getter, @setter, and @data, enabling automatic generation of methods and constructors. Additional features like @cleanup for resource management and various logger options are also covered, with more information available through the project's website.
Project Lombok!
- 2. Problems of the Industry Boiler Plate Code Syntax Verbosity Non Standardization Not following the standard code conventions!! Human Error/Dependency Repeatable things (defining Getters, Setters etc.)
- 3. Demo Video Taken from http://projectlombok.org/ Gives an idea what Project Lombok is and how it can be installed. Simple Demo of few Features.
- 4. Features @Getter, @Setter, @ToString, @EqualsAndHashCode, @Data @NoArgsConstructor, @RequiredArgsConstructor and @AllArgsConstructor @Cleanup, @Synchronized @Log @Delegate val
- 5. @Getter and @Setter Automatic Generation of getters and setters. Method will be public unless you explicitly specify an AccessLevel @Getter and/or @Setter annotation on class Disable getter/setter generation for any field by using the special AccessLevel.NONE @NotNull for nullity check Demo
- 6. @ToString Generates a default implementation of the toString() method Parameters Demo
- 7. @EqualsAndHashCode Generates hashCode and equals implementations from the fields (non-static, non-transient) Parameters Demo
- 8. Constructor level Annotations @NoArgsConstructor, @RequiredArgsConstructor, @AllA rgsConstructor Generates constructors that take no arguments, one argument per final / non-null field, or one argument for every field. Specialized constructor can be made. Compile-time error in case of any conflicts. Demo
- 9. @Data All together now: A shortcut for @ToString, @EqualsAndHashCode, @Getter on all fields, @Setter on all non-final fields, and @RequiredArgsConstructor Included annotations with changed parameters can be defined along with @Data
- 10. @Cleanup Automatic resource management: Call your close() methods safely with no hassle. Example: @Cleanup InputStream in = new FileInputStream("some/file"); If the type of object you'd like to cleanup does not have a close() method, but some other no-argument method like dispose() so write it as @Cleanup("dispose") TestClass t = new TestClass();
- 11. Logger Annotations! Generate a logger field with name “log” Four options @CommonsLog @Log @Log4j @Slf4j
- 12. And Lot More!!! Some other supported features like @Delegate, @Synchronized, val etc. More to come soon! Open Source Details can be found at http://projectlombok.org/
Editor's Notes
- #5: @Getter / @SetterNever write public intgetFoo() {return foo;} again.@ToStringNo need to start a debugger to see your fields: Just let lombok generate a toString for you!@EqualsAndHashCodeEquality made easy: Generates hashCode and equals implementations from the fields of your object.@DataAll together now: A shortcut for @ToString, @EqualsAndHashCode, @Getter on all fields, and @Setter on all non-final fields, and @RequiredArgsConstructor!@NoArgsConstructor, @RequiredArgsConstructor and @AllArgsConstructorConstructors made to order: Generates constructors that take no arguments, one argument per final / non-null field, or one argument for every field.@CleanupAutomatic resource management: Call your close() methods safely with no hassle.@Synchronizedsynchronized done right: Don't expose your locks.@LogCaptain's Log, stardate 24435.7: "What was that line again?"@DelegateDon't lose your composition.valFinally! Hassle-free final local variables.