Java

Transactions in 22.1Java EE applications 35222.2 What is a transaction 35322.3 Container Managed Transactions 35322.3.1 Transaction Property 35422.3.2 rolling back container managed transactions 35722.3.3 instance variables for a synchronization

first, the most commonly used bubble sort (easy to remember) two-layer cycle is 0 to length-1, the second layer of multi-minus I more efficient, exchange for two adjacentfor (int i=0;ifor (int j=0;jif (Score[j]>score[j+1]) {//change symbols in

PackageCom.yyq;/** Practice: * Store the absolute path of a Java file in a specified directory into a text file * * Idea 1. Recursively * 2 for the specified directory. Gets the path to all Java files in the recursive process * 3. Store these paths

dependent on the start and end of the user thread to build and destroy (thread private): Program Counter Register is a small memory space that acts as a line number indicator of the bytecode that is being executed by the current thread.

JSP Code:"Add attachment each attachment size cannot exceed 50mJS Code:function AddComponent (){var flag = document.getElementById ("Numsize"). Value;if (flag>9) {Alert ("You cannot add more than 10 attachments!");return false;}else{FCC =

When I first approached the design principle, I felt confused and didn't know what he was using. After a period of code plus understanding Java design patterns. The author suddenly felt that the code I had written was a bunch of *. Therefore, the

/* polymorphic Test 1. The prerequisite classes and classes must be inherited or implemented, and the methods will generally be overwritten by 2. function to improve code extensibility 3. Drawbacks when a parent class reference points to a subclass

This paper mainly introduces the garbage collection algorithm of Java Virtual machine.I. Overviewsecond, mark-Clear algorithmMark-sweep. Like a name, the algorithm is divided into two steps: Tags: objects that need to be recycled at the

main similarities: Lock is capable of accomplishing all the functions implemented by synchronized.Main differences: Lock has more precise threading than synchronized and better performance. the synchronized will automatically release the lock, but

1) classpath is the meaning of the classpath, and the suffix is. Java's source program compiles a class file with a. class suffix after it is successfully compiled. Classpath and import keyword is related, when the program compiles, encountered the

Title Description:Given a non-negative number represented as an array of digits, plus one to the number.The digits is stored such, the most significant digit was at the head of the list.Problem Solving Ideas:Set the carry, if the array is not enough,

Using Restlet in GeoServer to provide all the rest services, and all requests in the/rest directory in GeoServer are treated as a restful server, which is the call procedure for the rest serviceWhen creating a new project, you need to create a new

There are two types of member variables for a class: A variable that is modified by the static keyword, called a class variable or a static variable, and is not modified by static, called an instance variable.The difference between the syntax

Freemarker is a powerful web-side template technology, in the current web development, SEO and client browsing speed is particularly important, in which the static Web page is a good solution. The following describes the Java Web development

There is such a requirement that the loop array outputs a dynamic form with two rows in one rowSeparate arrays for each of the two groups, if the singular last one is a groupImportJava.util.ArrayList;ImportJava.util.List; Public class splitarray {

An inner class (Inner class) is a class that is defined in another class, a compiler phenomenon that is independent of the virtual machine. Benefits of the Inner class:     1. Hide mechanism: Inner classes can be hidden from other classes in the

Spring IoC Learning -- ApplicationContext and DispatcherServlet, springioc Spring MVC has recently been introduced in new projects, and some questions have been raised about Spring IoC Configuration During the learning process. Through colleagues'

Implementation and usage of the ThreadLocal classWhat is ThreadLocal? In fact, ThreadLocal is not a local implementation version of a Thread, it is not a Thread, but threadlocalvariable (Thread local variable ). It may be more appropriate to name it

@ Index usage -- javax. persistence. Index, @ index Package com. springup. utiku. model; import java. io. serializable; import javax. persistence. entity; import javax. persistence. generatedValue; import javax. persistence. generationType; import

Java basic syntax (1) One keyword Keyword Overview: some special-purpose words in Java are called keywords. The keyword has a special significance for the Java compiler. Exercise caution when using the sequence. Keyword features: all the letters