| 구분 |
Java 5.0 |
ActionScript 3.0 |
라이브러리
패키징 |
.jar |
.swc |
| 상속 |
class Employee extends Person{…} |
class Employee extends Person{…} |
변수정의 및
초기화
|
String firstName=”John”;
Date shipDate=new Date();
int i;
int a, b=10;
double salary; |
var firstName:String=”John”;
var shipDate:Date=new Date();
var i:int;
var a:int, b:int=10;
var salary:Number; |
| 정의되지 않은 변수 |
N/A |
It’s an equivalent to the wild card type notation *.
If you declare a variable but do not specify its type, the * type will apply.
A default value: undefined var myVar:*; |
| 변수 scopes |
block: declared within curly braces,
local: declared within a method or a block
member: declared on the class level
no global variables |
No block scope: the minimal scope is a function
local: declared within a function
member: declared on the class level
If a variable is declared outside of any function or class definition, it has global scope. |
| 문자열(String) |
2바이트 유니코드의 불변값 |
좌동 |
문장 종료 시
세미콜론(;) 사용 |
필수 |
라인별로 구분되면 생략가능 |
| Strict equality operator |
N/A |
=== for strict non-equality use !== |
| 상수 |
final 키워드로 정의
final int STATE=”NY”; |
const 키워드로 정의
const STATE:int =”NY”; |
| Type 체킹 |
Static (checked at compile time) |
Dynamic (checked at run-time) and static (it’s so called ‘strict mode’, which is default in Flex Builder) |
Type 체킹
연산자 |
instanceof |
is (instanceof - 예전방식) |
| as 연산자 |
N/A |
var orderId:String=”123”;
var orderIdN:Number=orderId as Number;
trace(orderIdN); // prints 123 |
| 기본형 |
byte, int, long, float, double,short, boolean, char |
모든 기본형은 ActionScript 오브젝트임.
Boolean, int, uint, Number, String
아래 문장은 같은 의미임.
var age:int = 25;
var age:int = new int(25); |
| 복잡한 유형 |
N/A |
Array, Date, Error, Function, RegExp, XML, 그리고 XMLList |
| 배열 및 초기화 |
int quarterResults[]; quarterResults =
new int[4];
int quarterResults[]={25,33,56,84};
|
var quarterResults:Array
=new Array();
또는
var quarterResults:Array=[];
var quarterResults:Array=
[25, 33, 56, 84];
특히, 인덱스 값 대신에 이름을 통해 요소에 접근가능함 (Hashtable 처럼) |
| 최상위 클래스 |
Object |
Object |
객체 캐스팅
(형변환)
|
Person p=(Person) myObject;
|
var p:Person= Person(myObject);
또는
var p:Person= myObject as Person; |
UP 캐스팅
(다형성) |
class Xyz extends Abc{}
Abc myObj = new Xyz(); |
class Xyz extends Abc{}
var myObj:Abc=new Xyz(); |
| 가변유형 |
N/A |
var myObject:* var myObject: |
패키지 구문
|
package com.xyz;
class myClass {…} |
package com.xyz{
class myClass{…}
} |
| 접근 레벨 |
public, private, protected, default |
좌동 |
| Custom access levels: namespaces |
N/A |
Similar to XML namespaces. namespace abc;
abc function myCalc(){}
or abc::myCalc(){}
use namespace abc ; |
| 콘솔출력 |
System.out.println(); |
trace(); |
임포트 구문
|
import com.abc.*;
import com.abc.MyClass; |
좌동 |
| Unordered key-value pairs |
Hashtable, Map
Hashtable friends = new Hashtable();
friends.put(”good”,
“Mary”);
friends.put(”best”,
“Bill”);
friends.put(”bad”,
“Masha”);
String bestFriend= friends.get(“best”); // bestFriend is Bill |
Associative Arrays
Allows referencing its elements by names instead of indexes.
var friends:Array=new Array();
friends[”good”]=”Mary”;
friends[”best”]=”Bill”;
friends[”bad”]=”Masha”;
var bestFriend:String= friends[“best”]
friends.best=”Alex”;
Another syntax:
var car:Object = {make:”Toyota”, model:”Camry”};
trace (car[”make”], car.model); // Output: Toyota Camry |
| Hoisting |
N/A |
Compiler moves all variable declarations to the top of the function, so you can use a variable name even before it’s been explicitly declared in the code. |
클래스
인스턴스화 |
Customer cmr = new Customer();
Class cls = Class.forName(“Customer”);
Object myObj= cls.newInstance(); |
var cmr:Customer = new Customer(); var cls:Class = flash.util.getClassByName(”Customer”);
var myObj:Object = new cls(); |
| Private 클래스 |
private class myClass{…} |
private 클래스는 없음
|
| Private 생성자 |
지원
보통 싱글톤에서 사용함 |
미지원.
Implementation of private constructors is postponed as they are not the part of the ECMAScript standard yet. To create a Singleton, use public static getInstance(), which sets a private flag instanceExists after the first instantiation. Check this flag in the public constructor, and if instanceExists==true, throw an error. |
| 클래스와 파일명 |
A file can have multiple class declarations, but only one of them can be public, and the file must have the same name as this class. |
A file can have multiple class declarations, but only one of them can be placed inside the package declaration, and the file must have the same name as this class. |
패키지 내에
정의할 수 있는
항목 |
Classes 와 interfaces |
Classes, interfaces, variables, functions, namespaces, and executable statements. |
|
동적 클래스
(define an object that can be altered at runtime by adding or changing properties and methods). |
N/A |
dynamic class Person { var name:String; } //Dynamically add a variable // and a function Person p= new Person();
p.name=”Joe”; p.age=25; p.printMe = function () { trace (p.name, p.age); } p.printMe(); // Joe 25 |
| function closures |
N/A.
Closure is a proposed addition to Java 7. |
myButton.addEventListener(“click”, myMethod);
A closure is an object that represents a snapshot of a function with its lexical context (variable’s values, objects in the scope).
A function closure can be passed as an argument and executed without being a part of any object |
| 추상클래스 |
지원 |
N/A |
| 함수 오버라이딩 |
지원 |
지원
override 명시해야 함 |
| 함수 오버로딩 |
지원 |
지원안함 |
| 인터페이스 |
class A implements B{…}
메소드 골격과 final 변수를 정의함 |
class A implements B{…}
오직 펑션 구문만 정의 가능함 |
| 예외처리 |
try, catch, throw, finally, throws
캐치하지 않은 예외는 호출자에게 전달됨 |
try, catch, throw, finally
A method does not have to declare exceptions. Can throw not only Error objects, but also numbers:
throw 25.3;
Flash Player terminates the script in case of uncaught exception.
|
| 정규식 |
지원 |
지원 |