what is serialization in java?
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Serialization is the process of converting a set of object instances that contain references to each other into a linear stream of bytes, which can then be sent through a socket, stored to a file, or simply manipulated as a stream of data. Serialization is the mechanism used by RMI to pass objects between JVMs, either as arguments in a method invocation from a client to a server or as return values from a method invocation.\n\nI think below resources could help u to get an overview of serialization
549462
I can't address the issue of the problems it causes in\na Service Oriented Architecture, but an RPC is a remote\nprocedure call.\n\nThe idea is that your program can make what *appears* to\nbe a typical function call, but what will happen "under\nthe covers" is:\n\n- the function arguments will be "marshalled" in some\nway in preparation for network transmission.  This may\nbe as simple as re-ordering the bytes of the arguments\nto account for machine "endianness" or it might involve\nserializing objects.\n- a server will be contacted on the remote machine which\nwill accept and unpack the arguments and then call the\nfunction on the remote machine to do the work.\n- whatever return value is generated will be packaged\nup and transmitted back to the calling machine, which\nwill unpack the value and allow the original "call" to\nretrieve the value.\n\nIt allows the source to make remote functions calls\nwhich appear to be local.
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Java is a garbage collected or managed language.  You do not need to call destructors explicitly, as Java controls when an object is no longer needed and will destroy it automatically.  While it is true you can call finalise(), it should not be used, except in extreme situations when you need to destroy the object.\nBut, as others have said, the destruction of the object is not guaranteed to be when you call the method.
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Your object will be passed by reference because\nthat's how Java passes all objects.  Only the\nprimitive types like "int" are passed by value.
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http://java.sun.com/developer/Books/JDBCTutorial/
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Why are you passing large amounts of data between programs?\n\nIt would be better to pass a pointer to the working storage location.\nYou may have to call another program to get the address of the storage.
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Object is an instance of a class.\n\nConstructor is a also a method which only gets called when an object is instantiated.  (ex. Myclass a = new Myclass)\n\nMethod is a new term for function.  You may write lines of codes inside of a method, and reuse it everytime(OO design)\n\nclass MyClass\n{\n   MyClass() // constructor\n   int AddNumber(int a, int b);  // method AddNumber returns a+b\n}\n\nmain\n{\n  Myclass myObject = new MyClass();  // myObject is an object\n  int sum = myObject.AddNumber(1,2); // 1 + 2 = 3\n  return 0;\n}\n\n\nHope that helps!!! Go java
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Direct from the creators of the Java.The Java Programming Language is an indispensible resource for novice and advanced programmers alike. \n\nDevelopers around the world have used previous editions to quickly gain deep understanding of the Java programming language, its design goals, and how to use it most effectively in real-world development. Now, Ken Arnold, James Gosling, and David Holmes have updated this classic to reflect the major enhancements in JavaTM 2 Standard Edition 5.0 (J2SETM 5.0). \n\nThe authors systematically conver most classes in Java's main packages, java.lang.*, java.util, and java.io, presenting in-depth explanations of why these classes work as they do, with informative examples. Several new chapters and major sections have been added, and every chapter has been updated to reflect today's best practices for building robust, efficient, and maintainable Java software. \n______________________________________\n      Key changes in this edition include \n       ----------------------------------------\nNew chapters on generics, enums, and annotations, the most powerful new language features introduced in J2SE 5.0 \nChanges to classes and methods throughout to reflect the addition of generics \nMajor new sections on assertions and regular expressions \nCoverage of all the new language features, from autoboxing and variable argument methods to the enhanced for-loop and covariant return types \nCoverage of key new classes, such as Formatter and Scanner \nThe JavaTM Programming Language, Fourth Edition, is the definitive tutorial introduction to the Java language and essential libraries and an indispensible reference for all programmers, including those with extensive experience. It brings together insights you can only get from the creators of Java: insights that will help you write software of exceptional quality. \n------------------------------------------------------------\nDirect from the creators of the JavaTM programming language, this Third Edition of The JavaTM Programming Language is a valuable resource for both novice and advanced programmers. More than 100,000 developers who programmed with C, C++, Smalltalk, or other high-level languages have used this book to get a concise, intelligent, and deep understanding of the Java programming language. \n\nThis book is what you need to understand the basic design goals of the language and the application of the language in real-world development. It provides unique insights into why and how the language was designed and intended to be used. \n\nThe authors describe the latest version of the language, as defined by The JavaTM Language Specification, Second Edition and implemented in version 1.3 of the Java 2 SDK, Standard Edition. This third edition has been structured to give more in-depth treatment of the newer language features as well as informative examples on using some of the new APIs. \n\n         New and/or revised in this edition: \n         ----------------------------------------\n- more details on language features, including an expanded section on nested classes\n- more comprehensive treatment of garbage collection and related programming issues\n- coverage of new APIs, such as collections and internationalization\n\nThoroughly revised from start to finish, this edition fully covers the features of the current release of the Java programming language and class libraries. The book serves as a tutorial introduction to the language and essential libraries as well as a reference. \n\nExperienced programmers will find this new edition to be a valuable reference and will gain new insights into the subtleties of the language. Novice and intermediate programmers will benefit from the valuable examples and clear explanations of language and library features. Make sure you understand the contents of this book before you begin any serious development for the Java platform. \n\nKen Arnold, a Staff Engineer at Sun Microsystems Laboratories, is a
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What do you mean by java class?
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//created by vinyl21 for yahoo answers\n//gjfr77@yahoo.com\nimport java.io.*;\nclass matrix{\nint n,m;\nint a[][]=new int[100][100];\nint r[]=new int[10];\nint c[]=new int[10];\nDataInputStream d=new DataInputStream(System.in);\n\nvoid input() throws IOException{\nSystem.out.println("ENTER THE NO OF ROW");\nn=Integer.parseInt(d.readLine());\nSystem.out.println("ENTER THE NO OF COLUMN");\nm=Integer.parseInt(d.readLine());\n\nfor(int i=1;i<=n;i++){\nfor(int j=1;j<=m;j++){\nSystem.out.print("("+i+","+j+"):");\na[i][j]=Integer.parseInt(d.readLine());}}}\n\nvoid process(){\nfor(int i=1;i<=n;i++){\nfor(int j=1;j<=m;j++){\nr[i]+=a[i][j];}}\n\nfor(int j=1;j<=m;j++){\nfor(int i=1;i<=n;i++){\nc[j]+=a[i][j];}}\n}\n\nvoid display(){\nSystem.out.println("given matrix");\n\nfor(int i=1;i<=n;i++){\nfor(int j=1;j<=m;j++){\n\nSystem.out.print(a[i][j]+"&#92;t");\n\n}\nSystem.out.println("&#92;n");}\n\nSystem.out.println("row sum");\n\nfor(int i=1;i<=n;i++){\nfor(int j=1;j<=m;j++){\n\nSystem.out.print(a[i][j]);\nif(j<m)System.out.print("   +   ");\nelse System.out.print("   =   ");}\nSystem.out.println(r[i]);\nSystem.out.println();}\n\nSystem.out.println("column sum");\n\nfor(int i=1;i<=n;i++){\nfor(int j=1;j<=m;j++){\n\nSystem.out.print(a[i][j]+"&#92;t");}\n\nif(i<n){\nSystem.out.print("&#92;n");\nfor(int d=0;d<m;d++){System.out.print("+&#92;t");}\n}\nelse {System.out.print("&#92;n");\nfor(int d=0;d<m;d++){System.out.print("=&#92;t");}}\nif(i==n){System.out.println();\nfor(int k=1;k<=m;k++){\nSystem.out.print(c[k]+"&#92;t");}}\nSystem.out.println();}\n\n}\n\nvoid displaye() throws IOException{\nSystem.out.println("PRESS ANY KEY TO EXIT");\nString n=d.readLine();}\n\n\npublic static void main(String args[])throws IOException{\nmatrix k=new matrix();\nk.input();\nk.process();\nk.display();\nk.displaye();}}\n\n/*output\nI:&#92;>cd j\n\nI:&#92;j>cd bin\n\nI:&#92;j&#92;bin>java matrix\nENTER THE NO OF ROW\n3\nENTER THE NO OF COLUMN\n3\n(1,1):1\n(1,2):2\n(1,3):3\n(2,1):9\n(2,2):8\n(2,3):7\n(3,1):4\n(3,2):5\n(3,3):6\ngiven matrix\n1       2       3\n\n9       8       7\n\n4       5       6\n\nrow sum\n1   +   2   +   3   =   6\n\n9   +   8   +   7   =   24\n\n4   +   5   +   6   =   15\n\ncolumn sum\n1       2       3\n+       +       +\n9       8       7\n+       +       +\n4       5       6\n=       =       =\n14      15      16\nPRESS ANY KEY TO EXIT\n*/
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The Integer class includes a method named parseInt() that serves just this purpose. An example of a simple program that performs this conversion is shown below:\n\n\npublic class s2i {\n\n   public static void main (String[] args) {\n\n      // String s = "fred";    // do this if you want an exception\n\n      String s = "100";\n\n      try {\n         int i = Integer.parseInt(s.trim());\n         System.out.println("int i = " + i);\n      } catch (NumberFormatException nfe) {\n         System.out.println("NumberFormatException: " + nfe.getMessage());\n      }\n\n   }\n\n}\n\n\n\nOther notes\n\nInteger.toString(int i) is used to convert in the other direction, from int to String. \n  \nIf you're interested in converting a String to an Integer object, use the valueOf() method of the Integer class instead of the parseInt() method.
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I'm assuming you're asking from a Java point of view, so I'll answer along those lines.\n\nAn interface defines a set of methods clustered around common theme. It provides no implementation at all. When a class "implements" an interface, it must provide an implemenation for each method defined in the interface.\n\nAn abstraction (or abstract class) also defines a set of methods clustered around a common theme. The main different is that the abstract class may have implemenation provided behind some or all of the methods, although it does not need to.\n\nIn Java, a class must extend exactly [abstract] class. If not specified, then Object is defaulted as that extended class.\n\nA class may implement as many interfaces as it wishes.
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Const adTypeBinary = 1\nSet objStream = Server.CreateObject("ADODB.Stream")\nobjStream.Open\nobjStream.Type = adTypeBinary\nobjStream.LoadFromFile sFileName\n\nResponse.BinaryWrite objStream.Read\nobjStream.Close\nSet objStream = Nothing
47709
Copying data byte by byte without looking at the bigger picture like the file or application you are actually trying to replicate to another site. This ensures system indifference, some level of security and sometimes it is the only way to copy across different storage networks. Fairly useful technology.
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The Java Servlet API allows a software developer to add dynamic content to a Web server using the Java platform. The generated content is commonly HTML, but may be other data such as XML. Servlets are the Java counterpart to dynamic web content technologies such as CGI, PHP or ASP. Servlets can maintain state across many server transactions by using HTTP cookies, session variables or URL rewriting.\n\nThe Servlet API, contained in the Java package hierarchy javax.servlet, defines the expected interactions of a web container and a servlet. A web container is essentially the component of a web server that interacts with the servlets. The web container is responsible for managing the lifecycle of servlets, mapping a URL to a particular servlet and ensuring that the URL requester has the correct access rights.\n\nA Servlet is an object that receives requests (ServletRequest) and generates a response (ServletResponse) based on the request. The API package javax.servlet.http defines HTTP subclasses of the generic servlet (HttpServlet) request (HttpServletRequest) and response (HttpServletResponse) as well as an (HttpSession) that tracks multiple requests and responses between the web server and a client. Servlets may be packaged in a WAR file as a Web application.\n\nMoreover, servlets can be generated automatically by JavaServer Pages (JSP), or alternately by template engines such as WebMacro. Often servlets are used in conjunction with JSPs in a pattern called "Model 2", which is a flavor of the model-view-controller pattern.
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In the object oriented world of thinking you have objects that are made of classes. These classes can be ordered through a special inheritance relationship into hierarchies of parent/child relationships. \n\nUpcasting means taking a reference to an object and changing\nits type to that of any of its parent classes. (for java, add to this list also all the interfaces that any of the parent classes may be implementing)\n\nFor example:\nclass A extends B{\n}\nclass B{\n}\nclass Program{\n\n    .......\n    B b = new B();\n    A a = (A) b; // this is upcasting!\n    .......\n}\n\nUpcasting in java is implicit. This means that you dont need\nthe preceding parenthesis with the upcasting type.\n    A a = b;\nwould have equally worked. This is because you are going from something specific (class B - child) to something more general (class A - parent) and the java compiler can infer this fact by its design.\n\nDowncasting is the opposite:\n    .......\n    A a = new B(); //here you have an object from class B\n                   //referenced to a variable of class A\n                   //Implicit upcasting happens here.\n\n    B b = (B) a; // this is downcasting.\n\nDowncasting must be explicit. If you try to downcast an\nobject to a type that cant be downcasted to, then the compiler will offer protection by giving you an error.\nOtherwise your program would have crashed at runtime.\n\nYou can test with the operator instanceOf whether a \ndowncast is safe.\nexample:\n   if (a instanceOf (B)) { \n        b = (B)a;\n   }\n\nThe problem with this is that it creates a dependency in that segment of code and the type B. If in the future you create sibling to B classes you will have to remember to change all the places where you are checking with "instanceOf" and this can be a try nightmare on a large system.\n\nSo, generally speaking, you want to create code that avoids downcasting. This is not always possible and not always a good idea as there are many cases where explicit downcasting is needed or at least is possible to use without problems. \nAgain generally speaking, you want to create designs that have parts that are as independent, decoupled, reusable, robust, modular, and change adaptive as possible. This is not easy because many of these forces lead you to contradictions. So its all about making choices.\n\nfor an easy visual guide to java have a look at an online tutorial that I have recently added to: http://www.thanassis.com/java/index.htm
854960
Your question is too broad/vague and I don't know which technologies you're talking about but if this is web-related, it sounds like you need to enable Buffering so that if you try to set a header that is superceded by another header that was already scheduled for output, the application is able to rewrite the existing headers in the buffer.  Once they're sent out, they can't be taken back so you can't write conflicting header information.