![Java Style Array Initialization
Groovy has always supported literal list/array definitions using square brackets ([])
and has avoided Java-style curly braces just to not conflict with closures.](https://image.slidesharecdn.com/groovy3-180919120929/85/Preview-of-Groovy-3-5-320.jpg)
Preview of Groovy 3
- 1. Preview of Groovy 3.0 Presented by Vijay Shukla (vijay@nexthoughts.com)
- 2. Agenda 1. Parrot Parser 2. Improve the loop statement 3. Do-while statement 4. Supports Lambda Expressions 5. Support Method and Constructor Reference 6. Support try-with resource statement 7. Support Java-style array initialization 8. Support interface default method 9. New Operator 10. Support for secure retrieval 11. Support runtime Groovydoc
- 3. Parrot Parser It has new parser Parrot which is far more flexible and maintainable thank the previous versions of groovy. It is enabled by default in Groovy 3.* We can disable it by using a system property. Use -Dgroovy.antlr4=false (set it via JAVA_OPTS)
- 4. Improve the loop statement Comma-separate expression is now supported. (Java Syntax) Do-While has been introduced. Groovy support multi assignment since 1.6 but now it also supported in for loop.
- 5. Java Style Array Initialization Groovy has always supported literal list/array definitions using square brackets ([]) and has avoided Java-style curly braces just to not conflict with closures.
- 6. Lambda Expressions The Normal Variants of Java Lambda Expression supported in Groovy 3.0 ● General Form ● Curly braces are optional for single expression ● Parameter Types are optional ● No Parenthesis required for a single parameter with no type ● No argument case It has additional features such as default parameter value.
- 7. Method and Constructor Reference Java 8 method reference syntax using double colon syntax is now supported.
- 8. Operators 1. !in 2. !instanceof 3. Elvis Operator (?=) 4. Identity comparison Operators (=== and !==) 5. Safe Indexing
- 9. Try with Resource Java 7’s has try-with-resource statement for ARM (Automatic Resource Management). Groovy 3.0 also support the same syntax as Java 7.
- 10. Interface Default Method Java 8 supports adding default implementations to interfaces. Groovy now supports this too.
- 12. Extra Stuff @Canonical:- It allows you to write classes in shortened form. It provide combination of features of @ToString, @EqualsAndHashcode, @TupleConstructor. @ToString:- default implementation of toString() method on the basis of fields in class @EqualsAnd Hashcode:- default implementation of equals() and hashcode(). @TupleConstructor:- provide classical constructor with default properties. Constructor implementation depends upon the order of the variable declaration. All above are defined in groovy.transform package