learn java using netbeans

Follow the examples to learn java multi-thread 7-object combination and release, java7- The purpose of learning thread security and synchronization is to implement reusable components or compile larger programs. Classes in java are object abstraction, so how to implement a thread security class is a technology we must know and use correctly. In the process of des

significantly different from the logical approach, which is significant for the completeness and rigor of the program description. C + + also has a similar mechanism, but we see a lot of C + + programmers are not accustomed to using these mechanisms.Java Beginners should fully learn this exception capture mechanism, develop good programming habits, and then use their own knowledge to use, for example, to p

memory is not an area of memory defined in the Java Virtual Machine specification, but frequent use can also cause outofmemoryerror anomalies to occur.A partial operation of NIO, which allocates out-of-heap memory directly using the native library, then operates through a Directbytebuffer object stored in the Java heap as a reference to this memory, avoiding cop

[]data = new char[6]; Public synchronized void push (char c) {if (index = = data.length) {try{this.wait (); }catch (Interruptedexception e) {}} this.notify (); Data[index] = c; index++; Public synchronized char pop () {if (index ==0) {try{this.wait (); }catch (Interruptedexception e) {}} this.notify (); index--; return Data[index]; } class Producer implements runnable{Syncstack stack; Public Producer (Syncstack s) {stack = s; public void Run () {for(int i=0; i The above is about

= "New passwords can ' t equal previously used ones") Public BooleanCheckfornewpassword (Listprevpasswords, String password) { return!prevpasswords.contains (password); }} Writing the annotation processor Public classUsecasetracker { Public Static voidTrackusecases (listcl) { for(Method m:cl.getdeclaredmethods ()) {UseCase UC= M.getannotation (usecase.class); if(UC! =NULL) {System.out.println ("Found use case:" + uc.id () + "" +uc.description ()); Usecases.remove (NewI

using genericsThe Aslist method in 38.ArraysBy turning the array into a collection, you can use the methods in the collection to make it easierHowever, you cannot use additions or deletions after becoming a collection because the array length is fixed. is exported. Unsupportedoperationexception ErrorIf the elements in the array are objects, then the elements in the array are converted directly to the elements in the collection when they become collec

implementation of the KeyListener interface will be the KeyListener interface to rewrite all the methods, but the real use of only one method, so rewrite the other methods but it is not necessary to do without effort * * Class Keymonitor extends Ke yadapter{public void keypressed (KeyEvent e) {int keycode = E.getkeycode (); /* Use the getKeyCode () method to get the virtual code for the key./* If the virtual code of the key that is acquired is equal to the UP key is the virtual code that

(). GetName () +" "+i);if(i== -) {Sd.start (); System.out.println (Sd.isalive ()); }//When i>20, the thread must have started, if Sd.isalive () is false, that is the state of death; if(i> -!sd.isalive ()) {//Try to start the thread againSd.start (); } } }}Calling a method on a thread that is already dead start() throws a illegalthreadstateexception exception.in"main" java.lang.IllegalThreadStateException at java.lang.Thread.start(Thread.java:595) at startDe

+item.getname ()); } } } Else{System. out. println ("Source Path:"+source+"is not exists!"); } }}//The above code is as simple as possible, of course, if the actual application should be all the exception to catch up, and the way to close the resources are not standard, but in order to facilitate the idea of keeping up with the eyes, superfluous things will not be written.And if you want to copy large files, you can add buffer classes to buffer, su

: (How to learn Java?) ) Maple Leaf Country Wanderer 2001-07-04 12:37:58 I can combine my experience to say to you roughly, hope to help you, less take detours. Learning Java In fact should rise to learn how to design this realm, in fact, learning program design is to accept a programming idea. The programming ideas o

for string types of connections. At the time of the connection string, the Java compiler creates a new StringBuilder class when implemented, invoking the "+" effect of the object's Append method.For the selection of string, StringBuffer, Stringbilder, you can refer to the following: "References:When we are using a string buffer to be used by multiple threads, the JVM does not guarantee that the StringBuild

Why should we learn the advantages of the spring framework in the Java framework? Why learning the Spring framework?A: convenient decoupling and simplified developmentSpring is a large factory that allows you to create all objects and maintain dependency between them.B: Support for AOP ProgrammingSpring provides Aspect-Oriented Programming, allowing you to easily intercept permissions and monitor programs.

Nearly half a year has not touched Java, since the decision to re-pick up Java, from the beginning of the complete taste of the example se start. This example is a case of showing a curriculum, using the STRUTS2 and hibernate frameworks. The source code is simple, but there are a lot of problems.For this code, exists in the Struts.xml, he told us, the COM folder

First, the computer programA collection of ordered commands that are written to allow the computer to perform certain operations or solve a problem.Second, Java SE (Standard Edition)The Foundation and core of 1.Java technology;2. Mainly due to the development of desktop applications.Third, Java EE (Enterprise Edition)1. Provide a complete solution for enterprise

Queues are FIFO.Implementing the queue code using the Java language:/* Queue */public class Queue {private int maxSize; Maximum Queue private long[] Quearray; Queue array private int front; Team head private int rear; Team tail private int nitems; Number of current queue elements//constructor public queue (int s) {super (); this.maxsize = S;this.quearray = new

in) throws Exception {int len = 0; in = new Bufferedinputstream (in); StringBuffer buffer = new StringBuffer (); while (len = In.read ())!=-1) {buffer.append ((char) len); return buffer.tostring (); } } 5. Modify Index.jsp 6, the preparation of basefile.jsp documents Notice the code in the basefile.jsp, no you can refer here /**************************************************************************************/ 7, to be completed here, it is necess

Connect to the mysql database using java: Because we have been using the XAMPP environment tool before, and then downloaded a WAMP to learn how to use PHP. Both of them integrate the MYSQL database and click start MYSQL directly. This is very simple and convenient, and their visual interfaces are the same. Take XAMPP

tool class under the Juc of the call, not the Java default monitor. The difference between the built-in lock and the display lock, you can see me under the Java Concurrency related articlesJava Concurrency programming topic http://blog.csdn.net/aitangyong/article/category/2298385Next look at thread dump print out what the message means, the basic of each thread is the same, we randomly select one, analysis

appearance, nature and properties of the object, and dynamic characteristics refer to the function and behavior of the object. Objective things are complex, but people always from a certain point of view, using the ability of abstract analysis, from a number of features to extract the most representative, the most reflective of the nature of the characteristics of the object to be studied in detail. People abstract the static characteristics of objec

This article explains the process of writing a HelloWorld program in Eclipse.Students who have just learned Java may write Java source code in Notepad, and finish compiling and running the Java program at the command prompt. Such a method is really enough to learn the basics of Jav