Java

The previous article was written 1 years ago ashamed ashamed, today a colleague asked me to demo and read the next article well, the main code did not write it, today addedPrevious address: http://www.cnblogs.com/rufus-hua/p/4159278.htmlWrite a new

1. After hibernate can be initialized, the sessionfactory can be used to get a session to manipulate object, no more writing SQL statements to the database through the JDBC DAO to operate. For

Java Multithreading Basics (iv) Java traditional thread synchronous communication technology write code to achieve the following functionsThe child thread loops 10 times, then the main thread loops 100 times, then goes back to the child thread loop 1

Recently continue to review the Java Foundation, to the Java reflection this part, the personal feeling that this part should be considered Java advanced features, in the daily development of the use of not much, the application is mainly tool

Enumeration (Enums)JDK1.5 adds a completely new type of "class"-- enum type. For this JDK1.5 A new keyword enumis introduced. We can define an enumeration type like this.public enum color{Red,White,Blue}You can then use Color mycolor =

Hiding properties in inheritance and overriding methodsIn Java, a subclass used to hide a variable can be different from the parent class, and if the access rights are changed, the permissions of the subclass are the same.A variable in Java that

Java Development Tools installation steps the following installation development tools STS link Download URLEclipse link Download URL JDK Installation JDK Links Marven Environment Marven Links Tomcat

Tire tree, also known as the Dictionary tree, is mainly used to find words, word frequency statistics.The usual, directly on the code.Package Tiretree;public class Tiretree {tirenode root;public tiretree (tirenode root) {this.root = root;} private

Error message:Publishing to Tomcat v8.0 server at localhost have encontered a problemCould not publish to the server. Java.lang.NullPointerExceptionThe operation that generated the error:Workaround:1. Locate the Tomcat profile "Context.xml" and add

Singleton mode is an object creation pattern that ensures that there is only one instance of a class in the system.In the Java language, this has two major benefits:1. For frequently used objects, you can omit the time to create the object;2. As the

Introduction to Java constant pool parsing and string intern When a Java application is running, the Java Virtual Machine will save an internal runtime constant pool, which is different from the constant pool of the class file and is the data

Use Eclipse for J2EE to develop Web programs, eclipsej2ee For a long time, we are used to using myeclipse to develop J2EE web programs. Although myeclipse is easy to use, it is charged. Eclipse for j2ee is free of charge and is sufficient to

Exception Handling-notes for bixiangdong Java basic tutorial and bixiangdong learning notes 1. Exception: The exception occurs during the program running.Exception: the problem itself is a specific thing in daily life. It can also be described in

Java record-76-Integer cacheThere is a simple example of Integer in the Integer cache, but the output result is unexpected: public class IntegerTest2 { public static void main(String[] args){ Integer i1 = 100; Integer i2 = 100;

Java record-78-variable parametersVarargs allows programmers to declare a method that accepts variable parameters. Note: variable parameters must be the last parameter declared by the method. Variable parameters are essentially an array. For a

JSP Data Interaction (2) and Servlet basics, jspservlet01. Application Principle and Application   01. The scope of the application object is the whole application service, and its responsibilities in the application are similar to a global variable.

Monitors several JVM commands (which can be used on a linux host) and jvmlinux 1. jstatThis command is useful for viewing Jvm stack information. Allows you to view the capacity and utility information of heap such as eden, kernel vor, old, and perm.

Java Collection knowledge sorting, java Collection knowledge       HashMap HashTable Inheritance Method extends AbstractMap implements Map extends Dictionary implements Map Thread Security No Yes (all

JAVA_SE basics-52. Anonymous internal class     Java anonymous internal class summary:   Internal class with no name. Is the simplified form of internal classes. Generally, this form can be used only once. An anonymous internal class is actually an

HQL Query Language Summary of hibernate HQL is short for Hibernate Query Language. HQL syntax is similar to SQL syntax, but HQL is an Object-Oriented Query Language. Therefore,SQL operation objects are data objects such as data tables and columns.,