for iterator

for (Iterator iter = OnlineClient.htOnlineClients.keySet (). iterator ();Iter.hasnext (); ) {int item = Integer.parseint (Iter.next (). toString ());Online ol = (online) OnlineClient.htOnlineClients.get (item);if (Ol.getcompanyid () = = CompanyID)

Import java.util.ArrayList; Import Java.util.HashMap; Import Java.util.Iterator; Import java.util.List; Import Java.util.Map; Import Java.util.Set; A method of looping through a map public class Circlemap { public static void Main (string[] args) {

1. Annotations (note: 5) Annotation use style (annotation style)This check allows you to control the style of the annotations you want to use.Missing deprecated (lack of DEPRECAD)Check whether the Javadoc markup for the java.lang.Deprecated

package com.xml; import Java.io.File;Import Java.io.FileWriter;Import java.io.IOException;Import Java.io.Writer;Import java.net.MalformedURLException;Import Java.util.Iterator; import Org.dom4j.Attribute;Import org.dom4j.Document;Import

The problem I encountered when I wrote a Java file with EditPlus. Copy Code code as follows: Import java.util.*; Class collection{ public static void Main (string[] args) { Collection c1=new ArrayList (25); C1.add (New

One or one pairs of multiple one-way association mappings The object model of a one-to-many relationship is often seen in daily life, taking students and classes, a class has a number of students, so the relationship between the class and students

XML if we have one of the following XML files, we can think of it as a table in the relation database, which is a relational table named managers, and a contains a record ( Record), and the service and implementation in the manager are a field!

using XStream to convert between Java objects and XMLXStream is a good thing, easy to convert between Java objects and XML, efficiency and readability are very high, the following is a test example I wrote, let's take a look. The required jar

Import java.util.*;Public class Object {public static void Main (string[] args) {String str1 = new String ("ABCDE");String str2 = new String ("ABCDE");String str3 = new String ("ABCDE");String STR4 = new String ("ABCDE");String STR5 = new String

To read and write XML documents using DOM4J, you need to download the DOM4J package first, dom4j the official website in http://www.dom4j.org/Currently the latest dom4j package download address: Http://nchc.dl.sourceforge.net/sourceforge/dom4j/dom4j-

A collection of Java program performance optimizationsCollectionCommon data structures such as the list Map set used in combinationLet's take a look at the list interface related classes have ArrayList Vector LinkedList they all implement the list

Package Yzhou.iterator;import Java.util.arraylist;import java.util.hashset;import java.util.iterator;import Java.util.list;import Java.util.Set; Public classtest01{ Public Static voidMain (string[] args) {List List=NewArrayList (); List.add ("AAA");

(a) List:ArrayListImplemented as an array. Space-saving, but the array has a capacity limit. Exceeding the limit adds 50% capacity and is copied to the new array with system.arraycopy (), so it is better to give a pre-estimate of the size of the

Often we want to delete some elements in the collection. Some may write like this.public void operate (List list) {for (Iterator it = List.iterator (); It.hasnext ();) {String str = (string) it.next ();if (Str.equals ("Chengang")) {List.remove (str);

In the shortest possible space, the features, implementations, and performance of all collections and concurrent collections are smoothed over. For all "proficient in Java" is actually not so confident people read.Constantly updated, please try to

I studied jabsorb and wrote a few simple examples, hoping to help cainiao get started quickly. I studied jabsorb and wrote a few simple examples, hoping to help cainiao get started quickly. First reference jabsorb-1.2.2.jar, slf4j-api-1.4.2.jar, slf4

The following is a copy of other people's diary, to facilitate their later use, only for their own learning.Package com.jackey.topic;Import java.util.ArrayList; Import Java.util.HashMap; Import Java.util.Iterator; Import java.util.List; Import

Hibernate One-to-many Mappings One-to-many relationship mappingKey point: A one-to-many relationship uses the Set implementation,Example: An employee can have more than one certificate of study.steps to use Hibernate framework: 1. Create

JDK8 has been out for a long time, here to learn a simple summary of the JDK5,JDK6 and Jdk7 new features:This article outlines:I. New features of JDK5Two. new features of Jdk6Three. New features of Jdk7I. New features of JDK5First, a brief

To create a table:CREATE TABLE EMPLOYEE ( ID INT not NULL auto_increment, first_name VARCHAR () default NULL, last_name VARCHAR () default NULL, salary INT default NULL, PRIMARY KEY (ID)); CREATE table CERTIFICATE ( ID INT NOT NULL