Java, C #, Swift syntax vs. quick check table

	Java 8	C # 6	Swift
Variable	Type variable name;	Type variable name;	var variable name: type;
Variable (type inference)	N/A	var variable name = initial value;	var variable name = initial value;
Constant	Final type constant name = initial value;	ReadOnly type constant name = initial value;	Let constant name: type = initial value;
Basic type	int short Long byte Double float Boolean Char	int short Long byte Double float bool Char	Int32 Int16 Int64 Int8 Double Float Bool Character
String	String Variable name = "";	String variable name = "";	Let variable name: string= "";
String embedding value	N/A	"\{Expression}"	"\ (expression)"
Variable string	StringBuilder	StringBuilder	var variable name: String;
Fixed constant group	Type [] Variable name ={element 1, Element 2};	Type [] Variable name ={element 1, Element 2};	Let variable name: type name [] = [element 1, Element 2];
Variable-length arrays (list)	arraylist< type >	list< type >	var variable name = type name [] ();
Append element	Add	Add	Append
Traverse	For (type variable: collection)	foreach (type variable in collection)	for (variable in collection)
Dictionary	treemap< key types, value types >	dictionary< key types, value types >	dictionary< key types, value types >
Dictionary initialization	treemap< key type, value type > variable name = new treemap< key type, value type > () { { Put (key 1, value 1); Put (key 2, value 2); } };	var variable name = new dictionary< key type, value type > () { [Key 1] = value 1, [Key 2] = value 2, };	var variable name: dictionary< key Type, value type >= [ Key 1: value 1, Key 2: Value 2 ];
Dictionary subscript	N/A (using the Get method)	Variable name [key]	Variable name [key]
Defining Functions (Methods)	return type method Name (parameter type 1, parameter 1, argument type 2 formal parameter 2) {}	Returns the Type method name (parameter type 1 parameters 1, parameter type 2 formal parameter 2 = default) {}	Func function name (formal parameter 1: Parameter type 1, external parameter name parameter 2: Parameter type 2 = default), return type {}
Calling a function (method)	Method Name (argument 1, argument 2);	Method Name (argument 1, argument 2);	function name (argument 1, external parameter name: argument 2);
Variable parameters	Returns the Type method name (parameter type ...). Formal parameter) {}	return type method name (params parameter type [] parameter) {}	Func function name (formal parameter: parameter type ...) return type {}
Outgoing parameters	N/A, wrapped inside the object	return type method name (ref argument type parameter) {} Returns the Type method name (out parameter type parameters) {}	Func function name (inout parameter: argument type), return type {}
Calling outgoing parameters	N/A	Actual parameters	& Actual Parameters
function type	N/A, replace with single-method interface	Action and Func series generic classes	(parameter type 1, parameter type 2) –> return type
Closed Package	(parameter type parameters)-expression () –> { Multi-line statements }	(argument type parameter) = = Expression () = { Multi-line statements }	{(formal parameter: parameter type) –> return type in expression} {() –> () in Multi-line statements }
Enumeration	Enum type name { enumeration value 1 (value 1), enumeration value 2 (value 2), enumeration value 3 (value 3); }	Enum type name { enumeration value 1= value 1, enumeration value 2= value 2, enumeration value 3= Value 3 }	Enum type name { Case enumeration value 1= value 1, enumeration value 2= value 2, enumeration value 3= value 3 }
Structure (value type)	N/A	struct struct name {member}	struct struct name {member}
Class (Reference type)	Class Name {member}	Class Name {member}	Class Name {member}
Creating an Object instance	New class name (argument 1, argument 2)	New class or struct name (argument 1, argument 2)	class or struct name (parameter name 1: Argument 1, external parameter name 2: Argument 2)
Static members	Static	Static	struct and enum static, class and Interface class
Access level	Public, publicly Protected, protection (in-package and subclass accessible) no modifier , default (in-package accessible) Private, privately	Public, publicly Protected, protection (subclass accessible) Internal, internal (accessible within Assembly) protected internal, internal protection (subclasses within the assembly are accessible) Private, privately	Public, publicly internal, internal (accessible within the module) Private, privately
Store Properties	N/a,get set Prefix method naming convention	Type property name {get; set;} = initial value;	var attribute name: type = initial value;
Calculated properties	N/a,get set Prefix method naming convention	Type property name { Get { } Set {//parameter is value } }	var property name: type { get { } Set (parameter) {//If the parameter name is not written, the default is NewValue } }
Indexer (subscript)	N/A	Return type this[parameter type argument] { Get { } Set {//parameter is value } }	Subscript (formal parameter: parameter type) –> return type { get { } set {//parameter is NewValue } }
Constructors	Class name (argument type parameter) {}	Class name (argument type parameter) {}	Init (formal parameter: parameter type) {}
Self instance	This	This	Self
Calling other constructors	Class name () { This (actual parameter); }	Class name (): this (argument) { }	Init () { Self.init (external parameter name: actual parameter); }
Inherited	Class derived class extends base class {member}	Class Derived classes: base class {member}	Class Derived classes: base class {member}
Call the base class constructor	Derived class name (parameter type parameter) { Super (parameter); }	Derived class name (parameter type parameter): Base (parameter) { }	Init (parameter: parameter type) { Super.init (external parameter name: parameter); }
Virtual functions	Can be overridden by default and cannot overwrite the final	Mark Virtual to cover	Default can be overridden, non-overriding the superscript @final
Sealing class	Final	Sealed	@final
Overwrite (override)	Non-modified, can add @override	Override	Override
Call the base class method	Super. Method ();	Base. Method ();	Super. Method ();
Type check	Base class instance instanceof derived type	Base class instance is derived type	Base class instance is derived type
Down transformation	Base class instance (derived type)	Base class instance (derived type) Base class instance as derived type	Base class instance as derived type Base class instance as? Derived types
Interface	Interface	Interface	Protocol
Implementing interfaces	Class Implement interface {member}	Class: interface {member}	Class: interface {member}
Abstract class	Abstract	Abstract	N/A
Extended	Default methods for interfaces	Extension methods	Extension
Name space	Package	Namespace	by module

Java, C #, Swift syntax vs. quick check table