Java

1, in the Java Virtual machine is not generic, all generic class parameters will be erased, as follows: Public void int num) {} publicvoidint num) {}These two methods are the same for the Java compiler and therefore cannot be compiled.2, the

StringBuffer in the storage of characters, there is an upper limit, once reached the line will be wrong, I encountered a project in the query data from the database, and then write to the local file, the amount of data is about 300,000, at this time

Since JAVA5.0 has added the high-quality, widely used, concurrency utility Util.concurrent, which was originally written by Douglea, and become a new package of JSR-166, a growing number of utility classes for concurrent programming are available in

Recently use Apache Commons-net.jar do ftp upload download function, click "Upload" when the error, as follows:1 Java.lang.ClassNotFoundException:org.apache.oro.text.regex.MalformedOnline search, there are two ways, 1: Maybe the local Windows XP

First, uninstall the system comes with the JDKIf Linux has its own openjdk, we need to uninstall it, or we can install the JDK directly.To see if the Linux-brought JDK is installed, enter the following command to view the Java version

These days began to re-learn Java, at the end of the course there is a question asked to find the device name, the title is as follows: 1. Write the program, will the string "printer * clock//bike * * Umbrella percent radio??" Computer "to split and

This blog is turned around. but a little change thanks to http://my.oschina.net/noahxiao/blog/101558SummaryFrom the perspective of the use of the scene to introduce the use of reentrantlock, relatively easy to understand some.Scenario 1: If the

Given a complete binary tree, count the number of nodes.Definition of a complete binary tree from Wikipedia:In a complete binary tree every level, except possibly the last, was completely filled, and all nodes As far left as possible. It can has

1 The choice of the overall architecture is to choose the heavyweight architecture or the Pojo lightweight architecture.2 system modeling, is the choice of process design or object-oriented design.Programmatic design means that the business logic

Custom "Invalid name exception"1. Compile-time exception, directly inherit exception2. Run-time exception, directly inherit RuntimeExceptionpublic class illegalnameexception extends exception{//compile-time exception//public class 

1:stringbuffer (Master)(1) Using string concatenation, more time-consuming and also consumes memory, and this splicing operation is more common, in order to solve this problem, Java provides a string buffer class. StringBuffer for our use. (2)

TOMCAT7 early out of the official version, but has not been used, especially for I have been in the use of Myeclipse6.5, it in the configuration of Tomcat when there is no tomcat7 option, so it reported the error message.[Java]View Plaincopy

These two days in a look at the threads of things, according to the Cow People's blog summed up some: Each Java program contains at least one thread: the main threads. Other threads are created through the thread constructor or by instantiating

Main excerpt: http://blog.csdn.net/zhangerqing/article/details/8194653Six principles of design patterns1. Opening and closing principle (Open Close Principle)The open and closed principle is to say to the expansion opening, to modify the closure .

Content: Generics in JavaExcellent article:Sina Blog-Ocean Planet: http://blog.sina.com.cn/s/blog_44c1e6da0100cus3.htmlBooks: Java, crazy Java handoutsDescriptionGenerics are new features added to Java SE1.5;The essence of generics is a

Java7 AIO Starter instance, the first is the server-side implementation:Service-side codeSimpleserver:Java code Public class Simpleserver { Public simpleserver (int port) throws IOException { final Asynchronousserversocketchannel

Blog: Http://blog.csdn.net/muyang_ren1. Quickly read a text file and output the contents of the file to a new file;

2.1 Installing the Java Development Toolbox 1.Java terminology Jdk-java development Kit software used by programmers writing Java programs Jre-java runtime environment software used by users running Java programs Update-The update

Now think about it as long as you know the principle, technology is through, and there is no point. Think of this comparison between the pros and cons of the two. J2SE is the Client-server way, that is to say the client needs our own

Chapter 2 Java programming environment and Chapter 2 java programming2.1 install Java development toolbox 1. Java terminology Software used by programmers who compile Java programs using JDK-Java Development Kit Software used by users who run