Java

Packagecom.test;ImportJava.io.FileReader; Public classTest2 { Public Static voidMain (string[] args)throwsException {Father Father=NewFather (); Father.test1 (); Father.test2 (); }}classfather{PrivateSon son =NULL; PublicFather () { This.

The so-called two-dimensional array, which can be simply understood as a "special" one-dimensional array, each of its array space holds a one-dimensional array.So how to use a two-dimensional array, the steps are as follows:1. Declaring arrays and

/** * @authorAdministrator * Benefits: Generics: 1 Security 2 reduced code reuse rate*/ Packagecom.test;ImportJava.lang.reflect.Method; Public classTest2 { Public Static voidMain (string[] args) {//TODO auto-generated Method Stub//gen gen1 = new Gen

Java Book recommendationsTransferred from: http://www.cnblogs.com/exclm/archive/2009/01/03/1367597.htmlFirst, Getting Started"Java 2 from Getting started to mastering"-recommendation"Thinking in Java"-Highly recommended *O ' Reilly Basic series of

1. Problem Scenario:When you deploy a project, deploy two apps to the same Tomcat, and the console appears Java.lang.OutOfmemoryError:PermGen Space error when you start the service through Startup.batServer environment:System version: Windows Server

Click to enter _ more _java thousand askHow switch usesThe switch allows you to perform different code for the value of a variable.The switch statement is similar to the IF Else statement, which can be implemented by the if else completely, with the

The parameters of a method in Java are always passed in a value -based manner.The following methods are intended for object exchange, but are not actually implemented. Public void Swap (Simpleclass A,simpleclass b) { Simpleclass temp=A; A=b;

In describing things, the things that already exist have some content, this is we can define them in the constructor, then what is the constructor?A constructor is a function that is called when a creation object is built, and it can initialize an

1. There are 3 types of loop control statements in Java, namely While,do ... while and for loops. 2. While loop in the form :While (boolean-expression){//code to be executed} 3. Do...while cycle, the new type is : Do{//code to be executed}while

/** * * @authorAdministrator * Function: interface manifests polymorphism*/ PackageCom.test4; Public classTest { Public Static voidMain (string[] args) {//TODO auto-generated Method StubCarshop AShop =NewCarshop (); Ashop.sellcar (NewBMW ()); Ashop.

ImportJava.awt.EventQueue; Public classPaint {PrivateJFrame frame; /*** Launch the application. */ Public Static voidMain (string[] args) {Eventqueue.invokelater (NewRunnable () { Public voidrun () {Try{Paint window=NewPaint ();

This semester of the new class-design mode, by my long-admired teacher to teach, unfortunately thinking too fast, the first section was the teacher picked up the code, from this in the heart of the Shadow, is the Java Foundation owed debtThis

Java Virtual MachineJava Virtual Machine Java supports platform independence, security, and network mobility. The Java platform consists of a Java virtual machine and a Java core class. It provides a unified programming interface for pure Java

Send email with JAVA note :( original from http://blog.sina.com.cn/liuanzhi), send email liuanzhi   To send an email using Java, in addition to the JDK jar package, two additional jar packages are required: JavaMail and JAF. Of course, if you use

Java Singleton-block series, java-block seriesSummarize the knowledge points step by step, and archive the previous knowledge that seems to be understandable, understanding the surface, and knowing what you don't know. Lazy singleton: private

Java QR code andDrop the downloaded jelly-core-1.7.0.GA.jar into the project, no need to write any java code, you just need to configure the relevant information in the project's web. xml file. The verification code is implemented based on Servlet

Java interview Summary 1. What is the difference between static variables and object variables?Static is a static variable, which can be directly accessed by Class NameMemory difference: When static is defined, jvm will allocate space,Object

Java Collection deep learning Summary-ArrayList Go deep into Java Collection Learning Series: implementation principle of ArrayList1. ArrayList Overview: ArrayList is a variable array implementation of the List interface. All optional list

JavaWeb001-first Web project, javaweb001-web Project   * Starting from "http: localhost: 8080" "Http: // localhost: 8080" is a url. url consisting of the following parts:     * When you enter "http: www.cdtu.com" in the address bar of your

In windows, nginx + tomcat group + redis realize session sharing, nginxredis     In this example Nginx 1.9.13 Tomcat 7.0.64 Apsaradb hybriddb for redis 2.8   Procedure: ① Prepare two tomcat servers, modify the port, and modify the index. jsp content