Java

First, introspection　　Introspection (introspector) is a default processing method of the Java language for JavaBean class properties and events. JavaBean is a special class that is used primarily to pass data information, in which methods are used

Java Data typesBoolean--true--falseBYTE--8 bitsShort--16 bitINT--32 bitsLong--64-bitCharFloat--32-bitDouble--64 bitsFloating point Standard i-eee-754Cannot guarantee accuracy, deposit Money data recommended int,9.99 Yuan = 999 points, no loss of

PackageTickect;classTicketnumImplementsrunnable{ Public intTickets = 100; String Str=NewString (); Public voidrun () { while(true) { synchronized(str) {if(tickets>0) {System.out.printf ("The Thread:%s is selling the%dth ticket!\n",

Import Java.util.Calendar;Import Java.util.Date;Import Java.util.Timer;Import Java.util.TimerTask;public class Timetest {public static void Main (string[] args) {Timer1 ();Timer2 ();Timer3 ();Timer4 ();}    //The first method: set the specified task

1 Importjava.util.Arrays;2 3 /**4 * Various sorting algorithms are sorted from small to large5 */6 Public classTest {7 8 Public Static voidMain (String args[]) {9 int[] n = {5, 2, 3, 4, 1 };Ten int[] N1, N2, N3; OneN1 = N2 = N3

/*** Upload comoms-fileupload*/diskfileitemfactory diskfileitemfactory=Newdiskfileitemfactory (); Servletfileupload SFU=Newservletfileupload (diskfileitemfactory); List fileitemlist =NULL; Try{fileitemlist=sfu.parserequest (Request); }

1. Create a new stream object, which of the following options is wrong? (B)ANewBufferedWriter (NewFileWriter ("a.txt")); B)NewBufferedReader (NewFileInputStream ("A.dat")); C)NewGzipoutputstream (NewFileOutputStream ("A.zip"));

Packagecom.xiaoysec.test;Importjava.util.ArrayList;Importjava.util.List;/***VM args:-verbose:gc-xms20m-xmx20m-xmn10m-xx:+printgcdetails-xx:survivorratio=8 *@authorXiaoysec **/ Public classHeapoom {Static classoomobject{//define a static inner class

The life cycle of a class:after a class has been compiled, the next step is to start using the class, and if you want to use a class, you can't do without JVM . In program execution , the JVM is completed by loading, linking, and initializing these 3

PackageLianxi;ImportJava.util.Random; Public classSuijishu { Public Static voidMain (string[] args) {random random=NewRandom (); int[] arr =New int[4]; arr[0] = Random.nextint (9); inti = 1; //Outer Loop definition four number while(I ) {

classbase{ Public Static intA = 10; Public intb = 20; Static{System.out.println ("Static Init Base" +a); //System.out.println ("Null Init" + b); } PublicBase () {System.out.println ("Init Base" + This. b); }}//the first-class subclass and

Java reflection, java Package com. reflect;Import java. lang. reflect. Method;Public class ReflectUitl {Public static Method getMethodDemo (Class clazz, String methodName,Final Class [] classes ){Method method = null;// MethodName: method name,

Spring extension points Spring extension points In the previous article, we introduced bean lifecycle in spring, and mentioned at the end that spring uses the BeanPostProcessor interface to process lifecycle callbacks. We can customize some logic in

Java-parsing equals from the stack constant poolI. basic concepts ① basic data types in JAVA (simple type, built-in type): byte type (byte), short INTEGER (short), INTEGER (int), long integer (long ), character type (char), float type (float),

Spring annotation (1) Overview The core of Spring is dependency injection (DI), and the basis of dependency injection is the configuration of dependency information. These configurations are called metadata. In the previous study, we used xml-based

Java web Learning notes-jsp, web Learning notes-jsp1. java web Overview  1.1 static and dynamic pages   Representation Required Technology Static webpage The webpage content is fixed and will not be updated Html, css

Summary of JSP website development 5 and jsp website development 5 Before proceeding to this summary, let's first talk about a small problem that exists in the previous article. The previous article summarized that there was a problem when creating

Java Zip/Unzip Files records Recently, Java is used in the project to implement the zip/unzip XML file function. The Java API can be used to conveniently compress and decompress files and record relevant code.Zip the source file to the target

Integer power of a value 1. Question Implement the double Power (double base, int exponent) function to calculate the exponent Power of the base. Do not use library functions, and do not need to consider large numbers. 2. Analysis First, determine

Summary of JSP website development 4 and jsp website development 4 After the first few articles, we will start to perform database operations. This article focuses on how to write database operation statements on the website. There is not much