Java

1. What are the similarities and differences between runtime exceptions and general exceptions?Answer: An exception indicates an unhealthy state that may occur during a program run, and a run-time exception that represents an exception that may be

The first simple explanation of the Java cross-platform features is equivalent to saying that a Java program can run on different operating system platforms (the platform here is simply viewed as an operating system platform). Let's use some

Read some of the so-called large companies of the Java interview problem, found that the use of the Java Collection class is more important, and in this respect really is really very little, take the time to learn to learn it.Java.util package

Excel book protection is very common, mainly do not want to let others modify Excel when used. This avoids malicious modification of data and increases the credibility of the data.Here is a Java POI for setting book Protection:You can use the

1. IntroductionJstat is used to monitor the hotspot-based JVM for real-time command-line statistics on the use of its heap, and with jstat we can monitor the specified JVM as follows:-Loading and unloading of classes-View capacity and usage of new

Java is a "strongly typed" language, and you must specify the data type when declaring a variable. Variable (variable) occupies a certain amount of memory space. Different types of variables occupy different sizes.Java has 8 basic data types,

In peacetime projects sometimes encountered high CPU situation, based on their own limited experience to write a share, here the server is based on the Linux platform.The CPU's occupancy thread type is generally divided into two types:US: User space

Create a TCP Client Client client = new Transportclient () . addtransportaddress (New inetsockettransportaddress ( "localhost", 9300 )); Create index Client.admin (). Indices (). Preparecreate ("pages"). Execute ().

A primitive type, or a built-in type, is a special type that differs from a class in Java. They are the most frequently used types in our programming. Java is a strongly typed language, and the first declaration of a variable must describe the data

A basic Java program typically consists of several parts, namely the package name of the program, the path to the other packages used in the program, the class of the program, the methods in the class, the variables, and the literal.Package

1. Jstat-gcutil 14331 3s3 seconds of monitoring memory recycling S0 S1 E O P ygc ygct FGC F 0.00 9.04 26.16 61.43 99.52 833 6.973 14 0.00 9.04 26.16 61.43 99.52 833 6.973 14 0.00 9.04 26.16 61.43 99.52 833 6.973 14 0.00 9.04 2

1. Download RPM installation package in OpenOffice http://www.openoffice.org/zh-cn/2, upload to the archive package (apache_openoffice_4.1.1_linux_x86-64_install-rpm_zh-cn.tar.gz) to the CentOS server,Tar zxvf

* Copy of text files can be achieved using FileReader and FileWriter.* For non-text files (video files, audio files, pictures), only the byte stream can be used!1 @Test2 Public voidTestfilereader () {3FileReader FR =NULL;4 Try {5File

One, what is reflection:The concept of reflection was first proposed by Smith in 1982, and was primarily a capability for a program to access, detect, and modify its own state or behavior . The proposal of this concept soon triggered the research on

LotusScript lifting Large string concatenation functions (functionally similar to StringBuffer in Java), the code is as follows:Class stringbuffer public count As Integer Private arr () as String private size As Integer Private increment As Integer

The Itoo project consists of two directions: JAVA,. NET.And the examination system is the Java direction, the business logic is the most complex one.After being ' 100 days ' in the ' exam system ', I still hope to get a relatively perfect

First, the problem description and the reason.An error occurred when implementing AOP using aspect annotations at:: 0 can ' t find referenced pointcut XXX. I thought the annotations were wrong, and the result was that the two jar packages with the

Hibernate (3) structure-configuration file-object ing and configuration file,I. Architecture SessionFactory: A thread-safe and immutable cache snapshot of the compiled ing file of a single database. Session factory. It is possible to hold an

Several cluster configurations of ActiveMQ and several clusters of activemq ActiveMQ is a powerful Messaging Server that supports many development languages, such as Java, C, C ++, and C. Enterprise-level message servers have high requirements on

Dark Horse programmer-java basics-basic knowledge (1), dark horse java  ------ Android training, java training, and hope to communicate with you! ------ A java keyword is a word defined in the programming language in advance and given a special