java class access modifiers

application can check the updated version of the inserted class on the web site or FTP and automatically verify the digital signature to ensure that the trusted code is executed. Many well-known software use their own class loaders. Generally, the default loader is the so-called Bootstrap Class Loader. It is responsible for loading key classes such as

There are four types of access modifiers for Java: Private, Protected, public, default.These four access modifiers do not have the same access rights.1.private: And private, the modifier with the narrowest limit on

are only two types of permission modifiers that can be used by declaring a class: public and DefaultCommon permissions public, accessible by all classesThe default permission has no modifiers and can be accessed by the class in the current package (the current folder).You can declare more than one

First, take a picture:For a class, the access control has only one public and no default modifier. Several other access modifiers are available for both variables and methods.The following describes the specific use.1. Public access Control (common)

1. Declaration of classDeclaration of the class itself: for the declaration of a class, it mainly includes the access rights declaration of the class and the use of the non-access modifier. For a common Java

("Lili"); }}Of course, member inner classes also use static modifiers, which makes access easier, but static inner classes can only access static external member variables . Public classTest { Public Static voidMain (string[] args) {Outer.Inner Inner=NewOuter.Inner (); Inner.getage (); }}classOuter {Private Static intAge = 20; Static classInner { Public voidG

Why should Java have access control?The settings for access permissions are related to the refactoring of the code. In a project, most of the time and money is invested in the maintenance of the code. Maintenance will certainly modify the existing unreasonable code. But in the process of refactoring, there is the problem: how do you ensure that the normal use of

, connection, and initialization. The loading stage must complete the following steps: 1) Get the binary byte stream that defines this class using the full qualified name of a class. 2) convert the static storage structure represented by this byte stream into the runtime data structure of the method area. 3) generate a Class object that represents this

} }///:~ Package pack1; public class Cookie {public cookie () { System.out.println ("Cookie constructor"); } protected void bite () {System.out.println ("bite");} For a class: A class cannot be declared as protected For the permission modifiers for a