Java

　On the Java foundation of the article, I think it can also be written in my other blog, is definitely original, and now share to everyone out. ----------------------------------------------------------------------------------------------------------

Transferred from: http://www.iteye.com/topic/528230Java program memory is mainly divided into 2 parts, including stack segment (stack memory area), heapsegment (heap memory area).In analyzing the memory allocation of Java programs, let's start with

Prerequisites for synchronization Must have two or more threads Must be all threads using the same lockThis ensures that only one of the threads in the synchronization is running Note When multithreading security issues are set to

The Java learning process appeared for the first time, background: tomb-Sweeping day and rain lasting 1 weeks. Method signature = Method name + parameter list. You need to be aware of the overriding method: 1. The compatibility of the method

Sort out some of the common methods of ArrayList according to Java1.6 's API.Three constructors1.public ArrayList (int initialcapacity);Constructs an empty list with the specified initial capacity2.PUBILC ArrayList ();Constructs an empty list with

1. Using the Scala class in ScalaIf you create a Scala class in a separate file, you can easily use them, just like (without explicit compilation) in a Scala script. However, if you want to use a Scala class in a compiled Scala or Java code, you

The Java reflection mechanism is in the running state, for any class, can get all the properties and methods of this class, for any one object, can call any of its methods; This dynamically acquired information and the ability to dynamically invoke

Read the 1-14 chapters.This book is really not suitable for beginners, and may be more suitable for people who have experience in Java for a year or two.Learning is really a spiral progressive process. Just started to learn basic Java grammar, the

An object that cannot be modified after the creation state is called an immutable object . Immutable objects are inherently thread-safe. Their constants (fields) are created in the constructor. Since their state cannot be modified, these constants

① first of all, the GC inside the JVM is used in the root algorithm, the root algorithm, what is called the root, that is, the static members of the class, static members is the type static decoration, is the "root" of one, the root also includes

To and FroTime limit:2000/1000 MS (java/others) Memory limit:65536/32768 K (java/others)Total submission (s): 5161 Accepted Submission (s): 3573Problem Descriptionmo and Larry have devised a by encrypting messages. They first decide secretly on

Public Object setDate (ResultSet rs,object o) throws ClassNotFoundException, Instantiationexception, Illegalaccessexception, Introspectionexception, IllegalArgumentException, InvocationTargetException, SQLException{Class cs = Class.forName

Hope to understand: one. Benefits of generics two. Expression Three. The role of four. , acts as a parameter type five. Wildcard nested . JDK1.5 introduced generics, benefits: 1. At compile time, type Check 2. Avoid type conversions, for

This article turns from http://www.cnblogs.com/elleniou/archive/2012/07/31/2617312.html[Regular expression] text box input content controlInteger or decimal: ^[0-9]+\. {0,1} [0-9] {0,2}$Only numbers can be entered: "^[0-9]*$".Only n digits can be

11. Add a member to the integrated SSH framework1, we write a secret member of the JSP file SSH characters add list --> name: 2. Modify the Struts.xml file--> /page/personlist.jsp/page/addperson.jsp3. Modify

public void Toposort () {//only for directed graphs, the basic idea is to find a non-successor node, delete it, and put it to the end of the sorted array, loop in turn. Until there is no node. int Originalvertex = nvertex;while (Nvertex > 0) {int

Because now in the classic books to consolidate some basic knowledge, so will often run some simple procedures, but do not want to open a large IDE. So just want to try to use Sublime-text to compile the program, oh, of course, if used to, with

Java Study Notes-JDBC4 (19), study notes jdbc4 16Database transactions 16.1 bank deposits # Create table account (accountid varchar (18), # account balance double () # balance) # deposit table create table inaccount (accountid varchar (18 ), #

Struts2 (13) internationalization-internationalization, struts2 internationalizationI. What is internationalization-I18N Internationalization There are 18 letters between the first letter I-ending letter n Feature: when the program is not modified,

Java studies a simple algorithm and encounters this output. Well, I didn't really pay attention to it before ...... Java studies a simple algorithm and encounters this output. Well, I didn't really pay attention to it before ...... What is this