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Class accessibility was covered earlier in the chapter. With class accessibility, there are only two modifiers internal and public. This section covers member accessibility. Class accessibility describes the visibility of a class; member accessibility describes the visibility of class members. Each member declared in a class is visible to various parts of the system, depending on the access modifier assigned to it in the class declaration. You ve seen that private members are visible only to other members of the same class, while public members can be visible to classes outside the assembly as well. In this section, we will look again at the public and private access levels, as well as the three other levels of accessibility. Before looking at the specifics of member accessibility, there are some general things we need to cover first: All members explicitly declared in a class s declaration are visible to each other, regardless of their accessibility specification. Inherited members are not explicitly declared in a class s declaration, so, as you shall see, inherited members might or might not be visible to members of a derived class. There are five member access levels: public private protected internal protected internal You must specify member access levels on a per-member basis. If you don t specify an access level for a member, its implicit access level is private. A member cannot be more accessible than its class. That is, if a class has an accessibility level limiting it to the assembly, individual members of the class cannot be seen outside the assembly, regardless of their access modifiers.

The interface also includes three predefined policies: ACCEPT_ALL, ACCEPT_NONE, and ACCEPT_ORIGINAL_SERVER. The last one will reject third-party cookies, accepting only those that come from the original server the same server as the response. To set the cookie policy for the CookieManager, call its setCookiePolicy() method the following:

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The member access modifiers in a class s declaration specify which other types can and cannot access which members of the class. For example, the following declaration shows members declared with the five access levels. public class MyClass { public int Member1; private int Member2; protected int Member3; internal int Member4; protected internal int Member5; ... The access levels are based on two characteristics with regard to the class being declared: Whether the class is derived from the class being declared Whether a class is in the same assembly as the class being declared These two characteristics yield four groups, as illustrated in Figure 7-15. In relation to the class being declared, another class can be any of the following: In the same assembly and derived from it (bottom right) In the same assembly but not derived from it (bottom left) In a different assembly and derived from it (top right) In a different assembly and not derived from it (top left) These characteristics are used to define the five access levels.

These translations are spotlighted in Table 1-2.

The public access level is the least restrictive. All classes both inside and outside the assembly have free access to the member. Figure 7-16 illustrates the accessibility of a public class member of MyClass. To declare a member public, use the public access modifier, as shown. Keyword public int Member1;

CookieManager manager = new CookieManager(); manager.setCookiePolicy(CookiePolicy.ACCEPT_ORIGINAL_SERVER); CookieHandler.setDefault(manager);

Figure 7-16. A public member of a public class is visible to all classes in the same assembly or other assemblies.

The private access level is the most restrictive. A private class member can be accessed only by members of its own class. It cannot be accessed by other classes, including classes that are derived from it. A private member can, however, be accessed by members of classes nested in its class. Nested classes are covered in 25. Figure 7-17 illustrates the accessibility of a private member.

The CookieManager class also has a constructor that accepts a CookieStore and a CookiePolicy:

Implicitly copied library Rewritten Copied library Implicitly copying Library template Library Usage of one library in another File Data values Set of libraries Program s call format Set of call formats Call handling process Individualized call handling processes Program name with multiple call formats

Figure 7-17. A private member of any class is visible only to members of its own class (or nested classes).

public CookieManager(CookieStore store, CookiePolicy cookiePolicy)

The protected access level is like the private access level, except that it allows classes derived from the class to access the member. Figure 7-18 illustrates protected accessibility. Notice that even classes outside the assembly that are derived from the class have access to the member.

Derived class Overridden Base class Inheritance Abstract class Concrete class Object Persistent object State Library, package Signature Interface Implementation Polymorphism Overloading

Figure 7-18. A protected member of a public class is visible to members of its own class or classes derived from it. The derived classes can even be in other assemblies.

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