for iterator

　　One. HASHMAP staff = new HashMap (); Add keyword value pairs, write your own traversal Set entries = Staff.entryset (); Iterator iter = Entries.iterator (); while (Iter.hasnext ()) { Map.entry Entry = (map.entry) iter.next (); Object key =

XML has now become a universal Data Interchange format, its platform-independent, language-independent, system-independent, to the data integration and interaction brought great convenience. The syntax and technical details of the XML itself need to

: In Java development We will certainly use a lot of collections, here I will summarize the common collection classes, the advantages and disadvantages of each collection class, so that we can better use the collection. Now I'm going to use a

Studied the Jabsorb, wrote a few simple examples, hoping to help rookie quick start. First reference Jabsorb-1.2.2.jar,slf4j-api-1.4.2.jar,slf4j-jdk14-1.4.2.jar,jsonrpc.js class file: Package com.test; Import Java.util.HashMap; Import

Dom4j feels a bit like JS. Let's take a look at some basic usage of dom4j. Basic usage 1. Gets the root node of the document.Element Rootelm = Document.getrootelement ();2. Get a single child node of a node.Element memberelm=root.element ("member")

As we all know, there are more and more ways to parse XML, but there are four main approaches: DOM, SAX, Jdom, and dom4j The following first gives the jar package download addresses for these four methods DOM: It's all in the Java JDK now, in the

The code is as follows: String pptfilename = null; for (iterator it = Fileslist.iterator (); It.hasnext ();) { if (It.next (). GetId (). toString (). Equals (method)) { pptfilename = It.next (). GetFilePath ();} Run times wrong:

In the Java collection framework, the set series is the simplest, and the set interface is the same as the collection interface,Abstractset is also very simple, only three methods are implemented, listed here. public boolean equals (Object o) {if (o

Xml This article is mainly about using the Commons-betwixt component to implement the transformation of XML information to Java Bean, the core class to achieve this function is Beanreader, if you look at Betwixt source code, you will find public

Copy Code code as follows: Package com.huateng.readcsv; Import Java.io.BufferedReader; Import Java.io.FileReader; Import java.util.ArrayList; Import Java.util.Iterator; Import java.util.List; public class Csvutil { Private String

The concept of environmental variables is not unfamiliar, is the operating system environment variables.The system variable is the variable that the Java itself maintains. Acquired by means of System.getproperty.For different operating systems,

Import Java.util.HashMap; Import Java.util.Iterator; Import Java.util.Map; Import Java.util.Set; public class Maptest {public static void Main (string[] args) { HashMap map = new HashMap (); Map.put ("A", "John"); Map.put ("B", "Dick"

Note Learning Java2sdk 1.4.0 Java.util has several important interfaces that are listed here as a summary of learning: 1 java.util.Enumeration There are two methods hasmoreelements (), Nextelement (). Use the following methods: Print all elements

Web As for action, the creation is done by Actionproxy, to see a brief program call Actionproxy proxy = Actionproxyfactory.getfactory (). Createactionproxy (namespace, ActionName, Extracontext); Request.setattribute

Today I saw java.util.Collections in this tool class. Public StaticvoidFill (listSuperT>list, T obj) { intSize =list.size (); if(Size instanceofrandomaccess) {//This line for(inti=0; i) List.set (i, obj); }

XML files play an important role in today's web development, from the database connection configuration to the settings of various other parameters, XML files in the application of reflection technology is very important, but also because the XML

I have studied json on my own today and it feels very useful. After testing, it is much faster than google's GSON. At the same time, Jackson can easily convert Java objects into json objects and xml documents, you can also convert json and xml into

J2SE 1.5 provides another form of a for loop. With this form of for loop, you can iterate over objects of types such as arrays and collection in a simpler way. This article describes how to use this loop in a specific way, explaining how to define a

Java container --- Set: HashSet & TreeSet & LinkedHashSet, --- sethashset1. Set interface Overview SetDo not save repeated elements (how to determine if the elements are the same ?). If you try to add multiple instances of the same object to the Set,

JAVA Collection class-a rare Summary     The following documents are summarized in your learning and hope to help you. If you want to reprint it, thank you. 1. StringBuffer thread security, StringBuilder thread security efficiency is slightly