Java

Learning materials "Crazy java handouts"Environment: MYSQLJava 1.7Java operations Database with JDBC is one of the foundations of Java programming. Mastering SQL is the foundation of JDBC programming. JDBC is the interface API developed by Sun, and

---restore content starts---First write technology blog, yesterday just applied for success ~ ~ ~ do not know what technical blog to write something, simply record their own learning process and the problems encountered it, big and small can

Public class calculator2{ privateint Add (int A,int b) { return A +b; } } Public classTest { Public Static voidMain (string[] args) {Calculator2 Calculator2=NewCalculator2 (); Class clazz = Calculator2.class; Object

26.1 Batch processing Introduction 39126.1.1 Step 391 in a batch job26.1.2 Parallel Processing 39226.1.3 status and determinant elements 39226.1.4 Batch processing Framework features 393Batch processing in 26.2Java EE 39426.2.1 Batch processing

I. OverviewRegular expressions because of their powerful string processing capabilities, have just begun to be widely used in various UNIX tools, such as the familiar Perl scripting language. Since then, regular expressions have been widely used and

To do mobile-side Android program, so use Java to develop. Later saw the Javaweb, think Java is very good, the function is very powerful, can do a lot of things, the most important is the resources are very rich, there are many open-source library

Assertion: The so-called assertion, is a new feature added after jdk1.4.It is used primarily during code development and testing, to judge certain critical data, and if the key data is not the data your program expects, the program warns or

EhCache is a pure Java in-process caching framework, which is fast and capable, and is the default Cacheprovider in Hibernate.features of the Ehcache cache:1. Fast. 2. Simple. 3. Multiple caching Strategies 4. There are two levels of cache data:

Think in Java as one of the Bible books in the Java language, almost every Java programmer must read the book, do not look embarrassed to say that they are Java programmers, but generally do not say that they seriously read, said that he turned over.

Ii. object-oriented oriented objectsEncapsulate the data with the class organization code, ObjectProcess oriented: Organize data by method (function), solve it with linear thinking, when the amount of data is small, there is no problem, when the

Design pattern: The most effective way to solve a certain kind of problem.23 Design Patterns in Java.Singleton design Pattern: Solving a class that only has one object in memory.The Runtime () method is designed in a single-instance design

When a variable is decorated with the final keyword in Java, is the reference immutable or does the referenced object not change?The address value of the reference object cannot be changed, and the contents of the object that the reference variable

1. Definition:Log4j2 refers to log4j 2.X and later2. InstallationLog4j-core-xx.jarLog4j-api-xx.jarLog4j-web-xx.jar (required reference for Web project)3. ConfigurationThe configuration file location is located in: src root directory, even if there

Using DOM4J to parse the downloaded XML file, the Java program is as follows:

Java does not provide any mechanism to terminate threads safely (preemptive methods), although methods such as Thread.stop and suspend provide this mechanism, but because of some serious flaws, it should be avoided.But it provides an interrupt

Thinking in Java --- correct termination of sub-threads During multi-threaded programming, we often start multiple sub-threads to complete a task, so how to exit these threads correctly when the task is completed or when the task is running to a

Java coding SpecificationThe first letter of each word in the naming conventions class must be capitalized, as shown in figureUserServiceIncorrect naming methoduserService、userserviceTest caseTestEnd, suchUserServiceTestIf it starts with the

Java object --- serialization and deserialization, java object --- serialization   Private static final String TEMP_ENCODING = "ISO-8859-1 ";Private static final String DEFAULT_ENCODING = "UTF-8 "; /*** Serialize a java object to a string* @ Param

Other Java Collection frameworks1. fastutil Fastutil is an extension of an open-source Java Collection Framework. It inherits the Java Collection Framework and provides several specific types of containers, it includes map, set, list, and priority

Hot Spot recommendation: deep understanding of Java class loaders First, let's review the steps for loading a java class on the java VM: After the java file is compiled by the compiler, it becomes a bytecode file. class file), the class Loader