free java projects with source code

a valueSystem.out.println (Staff.get ("157-62-7935")); //iterate through all entries for(Map.entryEntry:staff.entrySet ()) {String key=Entry.getkey (); Employee value=Entry.getvalue (); System.out.println ("key=" + key + ", value=" +value); } }}In addition, the Java language itself is open source, all these collection class implementation is open source,

Download related source code: Java. util. arraylist Java. util. abstractlist Java. util. List Arraylist is a variable-length array implementation of the List interface. All list operations are implemented and null values can be stored. Except for not synchronizing data, arr

Java Exception Handling involves a lot of principles and theories, and requires a little understanding and optimization. The source code is posted here, which only serves as an image-aware Java exception handling method. 1. Try catch Public class testtrycatch {public static void try () {int I = 1/0; try {} ca

Java Collection series [3] ---- HashMap source code analysis, java ---- hashmap We have analyzed the ArrayList and ArrayList sets. We know that ArrayList is implemented based on arrays, and ArrayList is implemented based on linked lists. They each have their own advantages and disadvantages. For example, ArrayList is s

Development Letters: New Instant Messaging Capabilities (Java WebSocket communication Technology ) below--------------------------------------------------------------------------------------------------------------- ----------A Code Generator (development tool); B Ali database connection pool druid; C security Permission framework Shiro;D Ehcache Custom Level two cache; E-Interface Development (new in vers

Java source code to C # five best toolsChszs, reprint need to indicate. Blog home:Http://blog.csdn.net/chszsFor some purposes, you may encounter the task of converting Java source code into C #

public class Computesourceline {public static void main (string[] args) throws FileNotFoundException {//TODO auto-generate D method stub//defines the relevant variable int totalline = 0;int Emptyline = 0;int Commentline = 0;int CodeLine = 0;//We all focus on the scanner class (network search) and The use of the string class (textbook P75 and the Network)//path to the file string strfilename;//using the command line, if there is a command line argument, the file name is obtained from the outside

Java. util. concurrent package source code reading 04 ConcurrentMap, java. util package The Map data structure in the Java Collection framework is non-thread-safe. Manual thread synchronization is required for use in a multi-threaded environment. Therefore, the

in the interface.Map is a mapping interface in which each element is a Key-value key-value pair. The same abstract class Abstractmap implements most of the functions in the map interface through the adapter pattern. TreeMap, HashMap, Weakhashmap and other implementation classes are implemented through inheritance Abstractmap. Other than that. The infrequently used Hashtable directly implements the map interface, and the vector is the collection class introduced by JDK1.0.iterator is an iterator

Hongye Qingcheng one-click webpage game server + client (no need to install Java) source code, no need to install java Qingcheng's one-click installation version server (including the client), without the need to install Java, you can directly start the server to enter the

the superclass, and the current class inherits from the superclass. To do this, the expressionSuper.scrub ()Will call the base class version of theScrub ()Method. In the process of inheritance, you do not necessarily have to use the method of the base class. You can also add a new method to the export class, which is added in the same way that you add any method to the class, defining it. The foam () method is one example. Readers inDetergent.main ()Will find that for adetergentObject, in add

Today to introduce you about how to implement Notepad in Java, is a very good case of learning Java Swing, the following first look at the results of the operation (download the address below): Here we look at the source code: [java] View Plain copy importjava.awt.*; impor

650) this.width=650; "style=" white-space:normal; "src=" http://gd2.alicdn.com/imgextra/i2/332189337/ tb2j08bbfxxxxx9xxxxxxxxxxxx_!! 332189337.png "alt=" tb2j08bbfxxxxx9xxxxxxxxxxxx_!! 332189337. "/>650) this.width=650; "style=" Margin:0px;padding:0px;width:30px;float:none; "src=" http://a.tbcdn.cn/sys/ Wangwang/smiley/48x48/92.gif "/> Development Express: New Instant Messaging capabilities (Java WebSocket communication technology ) below---------

Java-linked list source code principle analysis, and build a queue through the consumer list, java-linked list Here we will introduce the simplest linked list listing; Let's take a look at the add () method: public boolean add(E e) { linkLast(e); return true; } void linkLast(E e) { final Node Th

technologies, there is no need to download plugins or small programs.Ajax has a lot of merit, and it is these strengths that reflect its shortcomings (of course, the shortcomings can be overcome).Disadvantages:1. Security issues2. Support for search engines is relatively weak.3. The exception handling mechanism of the program is broken.4. The original intention of URL and resource location is violated.Actual combata simple, but useful example: TheJava version asynchronously verifies that userna

(Line.endswith ("*/")) {comment = false; }} else if (Line.startswith ("//")) {commentlines++; } else {normallines++; }}} catch (IOException e) {e.printstacktrace (); }} catch (FileNotFoundException e) {e.printstacktrace (); } finally {if (BR! = null) {try {System.out.println ("blank line number : "+whitelines); System.out. println ("Number of comment lines:" +commentlines);

Java. util. concurrent package source code reading 05 BlockingQueue, java. util package Everyone must be familiar with the producer-consumer queue. The producer is responsible for adding elements to the queue. If the queue is full, it will be blocked until a consumer takes the elements away. On the contrary, the consum

It seems that the weather in Xi'an is difficult to get better, and the continuous moderate pollution is suffocating. No nonsense. This morning I wrote a Java mail sending service class. Let's look at the source code: Package Dec; import Java. util. properties; import javax. mail. message; import javax. mail. messaging

); */bufferedimage image = null;try {image = Imageio.read (new File ("e:/i") Mage/mldn text 01.jpg "));} catch (IOException e) {//TODO auto-generated catch Blocke.printstacktrace ();} G.drawimage (Image,0,0,this), G.drawoval ((), G.setcolor (Color.Blue), G.fillrect (+--), G.setfont ( New Font ("Arial", 40,40)); g.DrawString ("Gobang game", 20, 100);} public void mouseclicked (MouseEvent arg0) {//TODO auto-generated method stub}public void mouseentered (MouseEvent arg0) {/ /Todo auto-generated m

Based on the analysis in the previous article "Introduction to Real Data Encryption Using DES (analysis)", Java can be used to encrypt strings, however, the legacy problem is that the string cannot be decrypted, because after the encrypted byte array is converted into a string, it will be different from the original byte array, and there will be fewer digits, I don't know why. Isn't a one-to-one conversion between a non-byte array and a string? Confus