head first java 2

. However, the above class diagram is a bit bad, that is, the specific observer class can only inherit the observer abstract class instead of implementing the Observer interface. If you are going to implement an interface, you should change the Abstractobserver class above to an interface and change notifyaction () to Notifyaction (Abstractsubject a). Many of the GUI framework's event and listener mechanisms are implemented through the observer pattern.

I received a short message yesterday: In February 2, long looked up, Happiness and happiness have no head, In the future, good things will continue, Good luck. Be careful when your money breaks your head, With affection and affection, Family reunion to white head, A good sign

Part 1:Software Development Process Overview-Head first OOA DReading Notes(1) In the first part(Http://www.cnblogs.com/lihongchao/archive/2008/01/12/1036586.html), Briefly introduces a typical process of software development, that is, the so-called lifecycle. to build a software project, all the steps here are essential, not to say that these steps are indispensable, but the specific work contained in them will certainly be taken into account, eit

"Client Implementationclient obtains stub objectCopy the stub files generated on the server directly to the client .the client calls the remote methodthe static method of Naming.lookup () is used to find a remote method registered on an IP (through naming.rebind () registration), returning a stub object MyRemote service= (MyRemote) naming.lookup ("rmi://127.0.0.1: service port number/remote Hello");If Naming.lookup does not specify a port number for the service, use the

spending, resulting in insufficient balance of the case of the deduction of money)Workaround: Add a synchronization method with the synchronized keywordFor example private synchronized void Makewithdrawal (int amount) {}Description: Each object is a lock with only one key per lock. Usually the object is not locked, only to see the synchronized synchronized method will be locked, the goal of synchronization is to protect important data, the actual lock is the method of accessing data. The key wi

[Reading Notes] Head first HTML with CSS version 2, headcss Appendix: HTML Cheat Sheet I read 300 pages one afternoon. This book is really a vernacular, and the target readers should be those who have no programming experience at all. Tips: IE cannot correctly display the border body around the page subject {border :} Index.html # id: Link to the page element with id Pixel: Your Computer Display is co

The fifth chapter uses the Java function library ArrayList add(Object elem) remove(int index) remove(Object elem) contains(Object elem) isEmpty() indexOf(Object elem) size() get(int index) The difference between a ArrayList and a general arrayArrayListArrayList myList = new ArrayList ();String a = new String("whoohoo");myList.add(a);String b = new String("Frog");myList.add(b);int theSize = myList.size();Object

Repair of oracle11gASM Disk Head damage (asm repair 2)-- Compile KFED[Oracle @ rac2 lib] $ cd $ ORACLE_HOME/rdbms/lib[Oracle @ rac2 lib] $ pwd/U01/app/oracle/product/10.2.0/db_1/rdbms/lib[Oracle @ rac2 lib] $ make-f ins_rdbms.mk ikfed[Oracle @ rac1 ~] $ Kfed read/dev/oracleasm/disks/VOL1Kfbh. endian: 1; 0x000: 0x01Kfbh. hard: 130; 0x001: 0x82Kfbh. type: 1; 0x002: KFBTYP_DISKHEAD -- the disk header is always

Tutorials | video Tutorials 　　54th Quarter:"Naruto" Cartoon Head production (2) 　　Course Objectives: Create Naruto title animation 　　Lesson points: use flash MX 2004 to produce "Naruto" animated cartoon head, this example is divided into six episodes, this is the second section. At the same time provide the FLA source file download, convenient for everyone to lea

Tutorials | video Tutorials 　　48th Quarter:"Machine Cat" cartoon Head production (2) 　　Course Objectives: Making machine cat title animation 　　Lesson points: use Flash MX 2004 to make "Robot cat" cartoon head, this example is divided into six episodes, this is the second section. At the same time provide the FLA source file download, convenient for everyone to le

the activity resumes when the B callback is completed. Reference variable: The reference variable is the same as a local variable and can be referenced only when it is in scope, referencing a local variable Instance variable: The scope of the instance variable is the class to which it belongs, and if the object is alive, the instance variable is also alive, and if the object is freed, it is freed (the instance variable and the object live on the heap)three ways to dispose of objects:1. Place t

The module is a text file that contains Python code, ending with a. py.Third-party modules are available on PyPI (Python package index), and you can use PyPI to publish your modules for others to use.Comment Code# coding=utf-8 "" "nester.py module module description put here" "" Def Print_lol (LI): "" "The description function is placed here :p Aram Li:list : return: None "" for each in Li: if isinstance (each, list): print_lol (All) else: print (e

1.publish2.update Print_lolPs:For Step 1.Write the code in to a py file. Put the py file into a folder named Nester. New a py file named ' Setup ' and the content as below:Setup (name='Nester', Version='1.0.0', Py_modules= ['Nester'], author='Myfirstpython', Author_email='[email protected]', the URL='Http://XXXX', Description='A Simple Demo of Python', )Put the folder Nest Upder the folder ' Python34 '. Run a Windows command line and run the Command:python setup.py sdistGet the screenshot as

1.the use of ' with open ... '2.the use of pickle (dump and load)For STEP1:The ' with open ... ' is the short format of ' try...except...finally 'For STEP2:You can store a list with pickle.dump () and get the content again with Pickle.load ()1>>>ImportPickle2>>> with open ('Test.pickle','WB') as data:3Pickle.dump (['a','2','et'],data)4 5 6>>> with open ('Test.pickle','RB') as ReadFile:7The_list =pickle.

through the contents of The. JNLPfourth step: The Web server sends A. JAR fileFifth step: JWs gets the. jar file and invokes the specified main () to start the applicationthe user can then launch the application via JWS offlinesteps to create and deploy a Java Web startfirst step: make the application executable jarrefer to the previous contentStep two: Write the. jnlp fileThis file specifies the version of the current jar, The. jar, and the main ()

The observer mode is introduced in the previous blog and the code of the "push" method is implemented. However, there are few introductions about the "pull" mode, the pull mode described in many materials on the Internet is not the observer mode at all. Let's take a look at how the PULL mode is implemented in JDK through some analysis. This book introduces the built-in observer mode in Java: Import Java. u

subclasses do not have to write many methods, the benefit of polymorphism is that all subtypes will have that methodObject classAll classes in Java are inherited from the class object, and object is not an abstract class. The 1.Object class has two purposesas a polymorphic method, many types of mechanisms can be dealt with.provides a specific code implementation of some of the methods, making it possible for any class to have methods available at exe