Appendix A: Java/Groovy 1
Feature | Java | Groovy |
|---|---|---|
Public class | public class | class |
Loops | for(Type it : c){...} | c.each {...} |
Lists | List list = asList(1,2,3); | def list = [1,2,3] |
Maps | Map m = ...; m.put(x,y); | def m = [x: y] |
Function definition | void method(Type t) {} | def method(t) {} |
Mutable value | Type t | def t |
Immutable value | final Type t | final t |
Null safety | (x == null ? null : x.y) | x?.y |
Null replacement | (x == null ? "y" : x) | x ?: "y" |
Sort | Collections.sort(list) | list.sort() |
Wildcard import | import java.util.*; | import java.util.* |
Var-args | (String... args) | (String... args) |
Type parameters | Class<T> | Class<T> |
Concurrency | Fork/Join | GPars |
No Java Analogue
Feature | Groovy |
|---|---|
Default closure arg | it |
Default value | def method(t = "yes") |
Add method to object |
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