5.1.6

String Conversions

CONVERSIONS AND PROMOTIONS

5.1.6   String Conversions

There is a string conversion to type

String

 from every other type, including the

null type.

5.1.7   Forbidden Conversions

There is no permitted conversion from any reference type to any primitive

type.

Except for the string conversions, there is no permitted conversion from any

primitive type to any reference type.

There is no permitted conversion from the null type to any primitive type.

There is no permitted conversion to the null type other than the identity con 

version.

There is no permitted conversion to the type

boolean

 other than the identity

conversion.

There is no permitted conversion from the type

boolean

 other than the iden 

tity conversion and string conversion.

There is no permitted conversion other than string conversion from class type

S

 to a different class type

T

 if

S

 is not a subclass of

T

 and

T

 is not a subclass

of

S

.

There is no permitted conversion from class type

S

 to interface type

K

 if

S

 is

final

 and does not implement

K

.

There is no permitted conversion from class type

S

 to any array type if

S

 is not

Object

.

There is no permitted conversion other than string conversion from interface

type

J

 to class type

T

 if

T

 is

final

 and does not implement

J

.

There is no permitted conversion from interface type

J

 to interface type

K

 if

J

and

K

 declare methods with the same signature but different return types.

There is no permitted conversion from any array type to any class type other

than

Object

 or

String

.

There is no permitted conversion from any array type to any interface type,

except to the interface type

Cloneable

, which is implemented by all arrays.

There is no permitted conversion from array type

SC[]

 to array type

TC[]

 if

there is no permitted conversion other than a string conversion from

SC

 to

TC .

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