6.4.2

The Members of a Class Type

NAMES

package vector;

public class Vector { Object[] vec; }

that has as a member a

public

 class named

Vector

, even though the standard

package

java.util

 also declares a class named

Vector

. These two class types

are different, reflected by the fact that they have different fully qualified names

( 6.7). The fully qualified name of this example

Vector

 is

vector.Vector

,

whereas

java.util.Vector

 is the fully qualified name of the standard

Vector

class. Because the package

vector

 contains a class named

Vector

, it cannot also

have a subpackage named

Vector

.

6.4.2   The Members of a Class Type

The members of a class type ( 8.2) are fields and methods. The members of a

class type are all of the following:

Members inherited from its direct superclass ( 8.1.3), if it has one (the class

Object

 has no direct superclass)

Members inherited from any direct superinterfaces ( 8.1.4)

Members declared in the body of the class ( 8.1.5)

Constructors ( 8.6) are not members.

There is no restriction against a field and a method of a class type having the

same simple name.

A class may have two or more fields with the same simple name if they are

declared in different interfaces and inherited. An attempt to refer to any of the

fields by its simple name results in a compile time error ( 6.5.6.2,  8.2).

In the example:

interface Colors {

int WHITE = 0, BLACK = 1;

}

interface Separates {

int CYAN = 0, MAGENTA = 1, YELLOW = 2, BLACK = 3;

}

class Test implements Colors, Separates {

public static void main(String[] args) {

System.out.println(BLACK); //

compile time error: ambiguous

}

}

the name

BLACK

 in the method

main

 is ambiguous, because class

Test

 has two

members named

BLACK

, one inherited from

Colors

 and one from

Separates

.

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