for iterator

Hibernate crawl strategy Fetch specific explanationOne, Hibernate crawl strategy (single-ended agent batch crawl Fetch=select (default)/join)Test Example:Student Student = (Student) session.get (Student.class, 1);System.out.println (Student.getname (

Copy Code code as follows: Package com.test; Import Java.io.BufferedReader;Import Java.io.BufferedWriter;Import java.io.FileNotFoundException;Import Java.io.FileReader;Import Java.io.FileWriter;Import java.io.IOException;Import

Often we want to delete some elements in the collection. Some might write that. Copy Code code as follows: public void operate (List list) { for (Iterator it = List.iterator (); It.hasnext ();) { String str = (string) it.next ();

There are two ways to parse XML files, one is to use DOM to parse, this way to write code more trouble, for the first programmers are more prone to problems; the second is to use the DOM4J package to parseWhen you want to use the DOM4J package, you

One, single thread1. Examples of anomaliesAs long as the exception is thrown, you can be sure that the code must have the wrong place. Let's take a look at all the situations where the concurrentmodificationexception exception appears, following the

The Java.util package contains a series of important collection classes. This article will start with the analysis of the source, in-depth study of the internal structure of a collection class, as well as traversing the collection of iterative mode

Java Source Analysis: In-depth discussion of iterator mode The Java.util package contains a series of important collection classes. This article will start with the analysis of the source, in-depth study of the internal

Original URL: http://www.cnblogs.com/skywang12345/p/3311252.htmlOverviewIn this chapter, we study the hashset.We first have a general understanding of HashSet, and then learn its source code, and finally through the example to learn to use HashSet.

iterator iterators OverviewThere are a number of collections in Java that are stored differently when storing elements. We're going to take out the elements in these collections, which can be done in a common way.Collection The general acquisition

XML has now become a universal Data Interchange format, and the platform's independence makes it necessary to use XML for many occasions. This article will detail four ways to parse XML in Java.XML has now become a universal Data Interchange format,

1. Working environment Ide:eclipse 3.1.2 Jdk:jdk1.5.0_04 tomcat:apache-tomcat-5.0.28 axis2:1.0 (War version and bin version) 2. Realize To create a new Dynamic Web project in Eclipse, add the jar packages required for Axis2 under Web-inf\lib.

/** * 3 Ways to implement Java object sorting * @author Zhangwenzhang * */ public class Testobjectsort { /** * @param args */ public static void Main (string[] args) {//TODO auto-generated method stub /** Method 1 * Using

In this tip, we'll look at some of the most common JNDI optimizations. In particular, we'll show you how to combine the cache and generic helper classes to create a factory-style solution for JNDI overhead. Reducing context instances Listing 1

In a Java program, to "process"-or, "traverse"-an array or an element in a collection, it is generally implemented with a for loop (of course, it is not possible to use other kinds of loops, but it is not known because the length of the word for is

Any container class must have some way to insert elements and retrieve them again. After all, holding things is the most basic work of a container. For list, add0 is one of the methods of inserting elements, and get () is one of the methods for

I. Introduction to SetSet is a collection that does not contain duplicate elements . More specifically, the set does not contain elements that satisfy e1.equals (E2). For E1 and E2, and contains a maximum of one null element.Class diagram for set:

Problem Difficulty: EasyTopic:Given a sorted array, remove the duplicates in-place such that each element appear only once and return the new L Ength.Do not allocate extra space for another array, you must does this by modifying the input array

XML has now become a universal Data Interchange format, and the platform's independence makes it necessary to use XML for many occasions. This article will detail four ways to parse XML in Java.AD:XML has now become a universal Data Interchange

Configuration of the Set collectionData table creation: Table relationships an employee has multiple identitiesCREATE TABLE EMPLOYEE (ID INT not NULL auto_increment, first_name varchar () default NULL, last_name varchar (default) NULL, salary INT

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