Groovy Learning Note-java 5 new features support

1. Enumerate enum

enumcoffeesize{Short, SMALL, MEDIUM, LARGE, mug}def ordercoffee (size) {print"Coffee order received for size $size:"Switch(size) { Case[Coffeesize.short, Coffeesize.small]: println' Conscious ' Break;  CaseCoffeesize.medium. CoffeeSize.LARGE:println' Programmer ' Break;  CaseCoffeeSize.MUG:println' Caffeine IV ' Break; }}ordercoffee (Coffeesize.small) ordercoffee (coffeesize.large) ordercoffee (coffeesize.mug) for(Size in coffeesize.values ()) {println size}/*Outputcoffee Order received for size Small:consciouscoffee order received for size Large:programmercoffee order Receiv Ed for size Mug:caffeine Ivshortsmallmediumlargemug*/

2.for-each Cycle

def list = [1,3,6,4,9' traditional for loop 'for (int i = 0; i < list.size (); i++) {    ' implements Itera ble interface for loop ' for(int  i:list) {    ' does not specify a type for loop 'for(i in list) {    println i}/*output legacy for loop 01234 implements the Iterable interface for loop 13649 does not specify a type for loop 13649* /

3. Variable length parameters

def receivevarargs (intint... b) {    "$a and $b"}def receivearray (int int [] b) {    "$a and $b"}receivevarargs (1,2,3,4,5) receivearray (1,2,3,4,5) /* OUTPUT1 and [2, 3, 4, 5]1 and [2, 3, 4, 5] */

4. Annotations [email protected]

classworker{def work () {println' Work '} def Analyze () {println' Analyze '} def writereport () {println' Writereport '}}classexpert{def Analyze () {println' Expert Analyze '}}classmanager{@Delegate expert expert=NewExpert () @Delegate worker worker=NewWorker ()}def Ironcrow=NewManager () Ironcrow. Work () Ironcrow. Analyze () Ironcrow. Writereport ()/*Outputworkexpert Analyzewritereport*/

5-Annotation @lazy: Lazy creation

//non-inert creationclassHeavy {def size= 10Heavy () {println ("Create Heavy with $size")    }}classasneeded {def value Heavy heavy1=NewHeavy () Heavy heavy2=NewHeavy (Size:value) asneeded () {println' Created asneeded '    }}classProgram {Static voidMain (string[] args) {def asneeded=NewAsneeded (value:1000) println asNeeded.heavy1.size println asNeeded.heavy1.size println asNeeded.heavy2.size Println AsNeeded.heavy2.size}}/*outputcreate Heavy with 10Create Heavy with 10Created asneeded1010nullnull*/

// Lazy Creation class asneeded {    def value    new  Heavy ()    new  Heavy (size:value)    asneeded () {        ' Created asneeded '    }}/*outputcreated asneededcreate Heavy with 101010Create Heavy with 1010001000* /

[Email protected] single case

true )class  theunique{    def sayHello () {        ' hello '    }} TheUnique.instance.sayHello ()/*outputhello* /

Groovy Learning Note-java 5 new features support