list of java programs for beginners

is particularly important, and therefore separately proposed. Moreover, different platforms for file names use the characters and the maximum file name length requirements are different, write your program to use the normal ASCII character as the name of the file, and can not be the same as the existing program in the platform, or it will cause conflicts.11. If you write a program that is a GUI program, you cannot rigidly set the size and location of components while using the AWT components, a

method rewrite:(a) The parameter list of a subclass method must be the same as the parameter list (number of arguments and parameter type) of the overridden method in the parent class, otherwise only the overloads of the method can be implemented.(b) The return value type of the subclass method must be the same as the overridden method return value type in the parent class, otherwise the method overload ca

server, you can test your client code on almost all HTTPS webpages on the Internet. The document section provides a list of server addresses that can be used for HTTPS communication testing. However, from the client's point of view, simply adding "S" after the familiar HTTP can achieve secure communication. This simplicity is full of confusion. In fact, the browser has done a lot of work in the background to ensure that no one has tampered with or ea

Entering the 21st century, the information industry has grown rapidly, in software development, the Java language and C # language are independently, has been gradually improved and widely used, the Java language and C # language is an object-oriented language, but Java programs and C #

Now, we use the Java language to write for the Palm OS Program The fields are not completely unified, and there are also many differences. Currently, there are several available application interfaces on the market, each application interface provides different access permissions to the current Palm OS application. Perhaps everyone is most familiar with Sun Microsystems, but it is not the only product that can write

itself. When a generic class (especially a generic collection) is transformed into a generic array, the true type of the generic array cannot be a generic parent type (such as a top-level class object) and can only be a subtype of a generic type (including, of course, its own type), or a type conversion exception will occur. An array of type T is declared through the Reflection class array, because we cannot get the parameters of the generic type at run time, so we need the caller to actively p

How to create executable Java programs Detailed description of executable jar packages and jar commands I often see someone asking on the internet how to compile a Java program into a. EXE file. Generally, there are only two answers. One is to create an executable JAR file package, and then double-click it to run it like the. chm file. The other is to use jet.Co

Writing high-quality code: 151 suggestions for improving Java programs (Chapter 1: arrays and collections ___ suggestion 60 ~ 64), java151 Oh, it understands that the river is neither as shallow nor as deep as the squirrel said. You can only know it if you have tried it yourself. --- Fable story: crossing the river by pony Data processing is a required function in each language.

The question is presented as follows: Suppose that there are some forms in our HTML page that need to be processed, and we need to initialize the fields in the database, what should we do? The standard solution is to use CGI scripts or server-side programs such as the Java servlet, but have you ever thought of writing a script that allows you to use JavaScript directly to invoke a server-side

objects.2. Preparation knowledgeBefore analyzing this example, let's take a look at several concepts about threads, locks, semaphores, and Java APIs.LockFor most programs, they need to communicate with each other to complete the life cycle of the entire thread. The simplest way to achieve synchronization between threads is locking. To prevent the two associated threads from mistakenly accessing shared reso

, variables, and so on belong to the class all do not belong to the object. A class is a type, a somewhat abstract thing, an instantiation of a class is an object, such as a human being, a person, a class, not a specific one, and to any person, such as a person, is an object.The package name, class name, method name, and variable name are usually taken by themselves, but it is best to see the name, use English and follow the hump naming method. The so-called hump nomenclature is when several wor

Writing high-quality code: 151 suggestions for improving Java programs (Chapter 1: Basic Types ___ suggestions 26 ~ 30), java151Recommendation 26: Beware of null values of the packaging type We know that Wrapper Types is introduced to Java to solve the instantiation problem of basic Types, so that a basic type can also be involved in the object-oriented programmi

the set can be automatically sorted, with the following code:1 public static int Getsecond (integer[] data) {2 //Convert to List 3 listRemove the repeating elements and arrange in ascending order, which is implemented by the TreeSet class, and then use the lower method to find the value less than the maximum value, you see, the above program is very simple? What if we were writing our own code? At least two times to calculate the valu

connection failed"); Implement a database connection with a pure Java JDBC driver Java programs can also connect to the database with a pure Java JDBC driver. This method is more widely used, but needs to download the appropriate driver package, because the different database connection code may be different, c

The shortcut for generating text using Java programs-Linux general technology-Linux programming and kernel information. The following is a detailed description. Most programs need to output some text, such as mail messages, HTML files, or console output. However, computers can only process binary data in essence. programmers must make the software generate unders

If there are any shortcomings, please understand and welcome the criticism, not very grateful.Please respect the author's labor results:This article original pipi-changingOriginal source of this article: http://www.cnblogs.com/pipi-changing/This document is owned by the author and the blog Park and must be retained without the author's consent.And in the article page obvious location to the original link, otherwise reserves the right to pursue legal responsibility.tips for debugging

Resolving database timeouts and deadlocks in Java programs 2011-06-07 11:09 anonymous help test networkfont Size:T | T The Java program resolves database timeouts and deadlocks, and each program that uses a relational database may experience data deadlock or unusable situations that need to be programmed in the code to resolve. This article mainly introduces the

If you do not use left-join or other multi-table join queries, you can use only single-table queries and Java programs to easily implement multi-table queries. As we mentioned last time, the left-loin clause is not used to associate queries. It may be to improve efficiency or configure cache, or to simplify the compilation of SQL statements. It is really easy to write a single table query. The problem is th

method.Back to top recommended 46:equals should consider a null value scenarioContinuing with the 45 suggested questions, we solved the question of the reflexive nature of the overwrite equals, is it perfect? To refactor the main method:public static void main (string[] Args) {person p1= new person ("zhang san"); Person p2= the new person (null);/* no changes in other parts, no more repeating */}Very small changes, you must know that the result is the package "null pointer" Except

method.Back to top recommended 46:equals should consider a null value scenarioContinuing with the 45 suggested questions, we solved the question of the reflexive nature of the overwrite equals, is it perfect? To refactor the Main method:public static void Main (string[] args) {person p1= new person ("Zhang San"); Person p2= the new person (NULL);/* No changes in other parts, no more repeating */}Very small changes, you must know that the result is the package "null pointer" except