6.5.5

Meaning of Expression Names

NAMES

Otherwise, the identifier appears within an interface declaration ( 9):

N

If there is not exactly one member of that interface ( 9.2) that is a field with

that name, then a compile time error results.

N

Otherwise, the expression name denotes the value of the single member

field of that name. The type of the expression name is the declared type of

the field. If the

Identifier

 appears in a context that requires a variable and not

a value, then a compile time error occurs.

In the example:

class Test {

static int v;

static final int f = 3;

public static void main(String[] args) {

int i;

i = 1;

v = 2;

f = 33;

//

compile time error

System.out.println(i + " " + v + " " + f);

}

}

the names used as the left hand sides in the assignments to

i

,

v

, and

f

 denote the

local variable

i

, the field

v

, and the value of

f

 (not the variable

f

, because

f

 is a

final

 variable). The example therefore produces an error at compile time

because the last assignment does not have a variable as its left hand side. If the

erroneous assignment is removed, the modified code can be compiled and it will

produce the output:

1 2 3

6.5.5.2

Qualified Expression Names

If an expression name is of the form

Q.Id

, then

Q

 has already been classified as a

package name, a type name, or an expression name:

If

Q

 is a package name, then a compile time error occurs.

If

Q

 is a type name that names a class type ( 8), then:

N

If there is not exactly one accessible ( 6.6) member of the class type that is

a field named

Id

, then a compile time error occurs.

N

Otherwise, if the single accessible member field is not a class variable (that

is, it is not declared

static

), then a compile time error occurs.

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