Java

Ten common methods of arrays tool classOriginal link: http://blog.csdn.net/renfufei/article/details/168294570. Declaring an array New String[5]; = {"A", "B", "C", "D", "E"}; New String[]{"A", "B", "C", "D", "E"}; 1. Print an array

ORM: is an abbreviation for the Object relational Mapping (objects relational mapping).The popular point is that the object is bound to the relational database, and the object is used to represent the relational data. In the o/r/m world, there are

Java Transit literal characters:1. Eight binary escape sequence: \ + 1 to 3 bit 5 digits; Range ' \000 ' ~ ' \377 ': null character2.Unicode Escape Character: \u + four hexadecimal digits; 0~65535\u0000: null character3. Special characters: 3\ ":

Recent projects have unit tests in writing Java code, and then in thinking about a problem, why write unit tests?? What's the use of unit tests?? Baidu has a lap, as follows: Software quality is the simplest and most effective guarantee;

public class Firstletteruppercase {public static void main (string[] args) {System.out.println (New Firstletteruppercase ( ). Upperfirstlatter ("letter")); System.out.println (New Firstletteruppercase (). UpperFirstLatter2 ("letter"));

Java Foundation strengthening knowledge points to be examined : junit Test 1. in the following note, which is the method for defining a Junit unit Test () (difficulty A)A,@TestB,@IgnorC,@BeforeD,@After knowledge points to be examined : Foundation-

PO (Persistant object) Persistent objectIn the case of the O/R mapping, there is no such concept if there is no O/R mapping. Usually the corresponding data model (database), itself also has some business logic processing. It can be seen as a Java

OverviewOne important difference between Java and C + + is the management of memory. Java's own active memory management and garbage collection technology make Java program apes do not need to release the memory of discarded objects. This simplifies

One, shallow copy, deep copyA shallow copy copies a member variable in an object: if it is a basic type, the copy is the value of the base type, and if the property is a memory address (reference type), the memory address is copied;Deep Copy, in

Exception hierarchy for exceptions JavaErrorThe class hierarchy describesJavainternal errors and resource exhaustion errors for the runtime system.The referencing program should not throw objects of this type.if such an internal error occurs,In

Warm tip: Axis2 jar bag yopublic static String Pubremotefuc () {String endpoint = "HTTP://CNBLOGS.COM/QGC/XXXX/SERVICE?WSDL";String result = "error";Service service = new service ();Call call;//Parameter ObjectSearchinfovo d=new Searchinfovo

Ext.: http://blog.csdn.net/zhangjg_blog/article/details/18319521What is an immutable object?As we all know, in Java, the string class is immutable. So what exactly is an immutable object? It can be said that if an object cannot change its state

InterfaceA. Syntax:Public interface Interface Name {public void foo ();}Two. Features1. Interfaces cannot be serialized2. The implementation class must implement all methods of the interface3. Implementation classes can implement multiple interfaces4

Background export Excel1. Importing the JAR PackageLink: Http://pan.baidu.com/s/1c2L70lE Password: nvhh2. Get the absolute path2. Source code:

1 Write a test class and simply understand how junit can be partially used to replace Java's Main method 2 Add annotations on the test class method @Test3 @Test Modified method requires: Publicvoid Method name () {...}, method name custom

Java getting started -- (4) multithreading, java getting started MultithreadingKey words: Thread, Thread, Runnable, sleep (), yield (), join (), synchronization I. Thread Overview In an operating system, each independently executed program can be

Java basics-TreeSet, javatreeset TreeSet is the implementation class of the SortedSet interface. Sorted is classified in English. TreeSet ensures that the elements of the set are sorted. Compared with the HashSet set, TreeSet provides the following

14. Future mode in Java, 14. JavaFuture Mode Jdk1.7.0 _ 79 This article is actually a continuation or supplement to the submit method of the above 13. ThreadPoolExecutor thread pool. In the submit method mentioned above, FutureTask appears, which

Dom4j creates and parses xml documents and dom4jxml documents DOM4J Parsing Features: 1. A smart branch of JDOM, which combines many functions beyond the representation of basic XML documents. 2. It uses interfaces and abstract basic class methods. 3

Log4j2 Analysis and Practice, Log4j2 analysis practice Currently, Chinese articles on Log4j2 on the network are scattered. Here I have compiled some comprehensive articles on Log4j2 for the reference of the majority of technical staff. Log4j2