A brief introduction to 11ACM 朱旻申

Outline What is Groovy ? Differences between Groovy & Java About closure & Dagger Methods

Groovy … An agile and dynamic language for the Java Virtual Machine Builds upon the strengths of Java but has additional power features inspired by languages like Python, Ruby and Smalltalk Provides the ability to statically type check and statically compile your code

An Example In Groovy : In Java :

Grammar vs Java No “;”, “()” & “public” No constructor, no “return” No types, everything is an object Closure

Grammar Java without types

Grammar Loop

Grammar Use “?” to avoid NULL pointer call

Closure Codes in “{}”

Closure in iteration

Dagger Methods Short, small but efficient Mostly implemented by closure

eachWithIndex Running results : 1 : a 2 : b 3 : c

any & every Running results : true false

grep [‘a’, ‘ab’] [‘ab’]

sort Running results : 7, 23, 2012

References Wikipedia 百度文库