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Cytat
Do celu tam się wysiada. Lec Stanisław Jerzy (pierw. de Tusch-Letz, 1909-1966)
A bogowie grają w kości i nie pytają wcale czy chcesz przyłączyć się do gry (. . . ) Bogowie kpią sobie z twojego poukładanego życia (. . . ) nie przejmują się zbytnio ani naszymi planami na przyszłość ani oczekiwaniami. Gdzieś we wszechświecie rzucają kości i przypadkiem wypada twoja kolej. I odtąd zwyciężyć lub przegrać - to tylko kwestia szczęścia. Borys Pasternak
Idąc po kurzych jajach nie podskakuj. Przysłowie szkockie
I Herkules nie poradzi przeciwko wielu.
Dialog półinteligentów równa się monologowi ćwierćinteligenta. Stanisław Jerzy Lec (pierw. de Tusch - Letz, 1909-1966)
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.A private field is not visible outside its class definition.protectedA keyword that is a visibility modifier; it can be applied to method and field variables ofclasses.A protected field is visible only within its class, within subclasses, or within thepackage of which its class is a part.Note that subclasses in different packages canaccess only protected fields within themselves or within other objects that aresubclasses; they cannot access protected fields within instances of the superclass.protocol handler Software that describes and enables the use of a new protocol.A protocol handlerconsists of two classes: a StreamHandler and a URLConnection.publicA keyword that is a visibility modifier; it can be applied to classes and interfaces and tothe method and field variables of classes and interfaces.A public class or interface isvisible everywhere.A non-public class or interface is visible only within its package.Apublic method or variable is visible everywhere its class is visible.When none of theprivate, protected, or public modifiers are specified, a field is visible only withinthe package of which its class is a part.public key cryptographyA cryptographic system that requires two keys, a public key and a private key.Theprivate key can be used to decrypt messages encrypted with the corresponding publickey, and vice versa.The public key can be made available to the public withoutcompromising cryptographic security.reference typeAny object or array.Reference types are manipulated, assigned, and passed to methods"by reference." In other words, the underlying value is not copied; only a reference to it is.See also primitive type.reflectionThe ability of a programming language to interact with structures of the language itself.Reflection in Java allows a Java program to examine class files at runtime to find outabout their methods and variables, and to invoke methods or modify variablesdynamically.Remote Method Invocation (RMI)RMI is a native Java distributed object system.With RMI you can pass references toobjects on remote hosts and invoke methods in them just as if they were local objects.rootThe base of a hierarchy, such as a root class, whose descendants are subclasses.Thejava.lang.Object class serves as the root of the Java class hierarchy.SecurityManagerThe Java class that defines the methods the system calls to check whether a certainoperation is permitted in the current environment.serializeTo serialize means to put in order or make sequential.A serialized object is an object thathas been packaged so that it can be stored or transmitted over the network.Serialized methods are methods that have been synchronized so that only one may be executing ata given time.serverThe application that accepts a request for a conversation as part of a networkedclient/server application.See also client.shadowTo declare a variable with the same name as a variable defined in a superclass.We saythe variable "shadows" the superclass's variable.Use the super keyword to refer to theshadowed variable, or refer to it by casting the object to the type of the superclass.signatureA combination of a message's message digest, encrypted with the signer's private key,and the signer's certificate, attesting to the signer's identity.Someone receiving a signedmessage can get the signer's public key from the certificate, decrypt the encryptedmessage digest, and compare that result with the message digest computed from thesigned message.If the two message digests agree, the recipient knows that the messagehas not been modified and that the signer is who he or she claims to be.signed classA Java class (or Java archive) that has a signature attached.The signature allows therecipient to verify the class's origin and that it is unmodified.The recipient can thereforegrant the class greater runtime privileges.shortA primitive Java data type that's a 16-bit two's-complement signed number (in allimplementations).socketAn interface that listens for connections from clients on a data port and connects theclient data stream with the receiving application.staticA keyword that is a modifier applied to method and variable declarations within a class.Astatic variable is also known as a class variable as opposed to non-static instancevariables.While each instance of a class has a full set of its own instance variables, thereis only one copy of each static class variable, regardless of the number of instances ofthe class (perhaps zero) that are created.static variables may be accessed by classname or through an instance.Non-static variables can be accessed only through aninstance.stream A flow of data, or a channel of communication.All fundamental I/O in Java is based onstreams.StringA class used to represent textual information.The String class includes many methodsfor operating on string objects.Java overloads the + operator for string concatenation.subclassA class that extends another.The subclass inherits the public and protectedmethods and variables of its superclass.See also extends.superA keyword that refers to the same value as this: the instance of the class for which thecurrent method (these keywords are valid only within non-static methods) wasinvoked.While the type of this is the type of the class in which the method appears, thetype of super is the type of the superclass of the class in which the method appears.super is usually used to refer to superclass variables shadowed by variables in thecurrent class.Using super in this way is equivalent to casting this to the type of thesuperclass.superclassA class extended by some other class
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