As3.0与java 5语法对比

Below is a short comparison table of major elements/concepts of these two languages for a quick reference.

You can read this table either left-to-right or right-to-left, depending on what’s your primary programming language is today.

This list is not complete, and your input is appreciated.

Concept/Language Construct

Java 5.0

ActionScript 3.0

Class library packaging

.jar

.swc

Inheritance

class Employee extends Person{…}

class Employee extends Person{…}

Variable declaration and initialization

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;

Undeclared variables

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:*;

Variable 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.

Strings

Immutable, store sequences of two-byte Unicode characters

Immutable, store sequences of two-byte Unicode characters

Terminating statements with semicolons

A must

If you write one statement per line you can omit it.

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