Java

1. oracle8/8i/9i database (thin mode)Class.forName ("Oracle.jdbc.driver.OracleDriver"). newinstance ();String url= "Jdbc:oracle:thin: @localhost: 1521:ORCL";ORCL the SID for the databaseString user= "Test";String password= "Test";Connection conn=

The following is my study of multi-threaded records of knowledge points, and did not elaborate on each knowledge point, just the important knowledge points recorded down, there is time to see, if there is not the place, welcome to spend, thank you!1,

The file class is an abstract representation of files and directory names in Java. The file class can be used to create, delete, rename, get paths, create time, and so on, and is the only operation related to the file itself. Therefore, it is

1. Java wrapper classWrapper class Correspondence Table Basic data types Packing class Byte Byte Boolean Boolean Short Short Char Character

One, the Java graphical interface1.AWT java.awtjdk1.4 before the introduction of the graphical interface, written in C + +, cross-platform is not good2.swing javax.swingjdk1.4 when the graphical interface, the cross-platform of goodSecond, the

In order to solve the problem that the Java basic data type will overflow and be computationally inaccurate during operation. Java provides two classes of BigInteger and BigDecimal, specifically for high-precision operations. Anything that can be

Sorting has always been a headache for me, before the "data structure" soy sauce went, the whole semester down only reluctantly can write a bubble sort. Since the second half of the preparation of work, but also know the importance of sorting

Polymorphic separations do what and how to do it. Also becomes dynamic bound, late-bound, or run-time bound.8.1 Further discussion upward transformationAn object can be used as its parent type, called an upward transformation.A method accepts the

Writer:bysocket (mud and brick pulp carpenter)Weibo: BysocketWatercress: BysocketFacebook:bysocketTwitter:bysocketMason remembers and Zao Jianrong "blog Park" last chat, Dragon Brother asked a session of the question. What I understood at the time

decorator often translated into "decoration", I think translated into "painter" more image point, painter (decorator) is used to brush paint, then painted objects we call decoratee. Both of these entities are required in the decorator mode.Decorator

Before encountering such a problem in the project:Class B inherits the class, a, and when it is instantiated, a method of B is called in the constructor of a, and the member property of B is initialized in the method of B, and then the member

Background: Recently in the construction of a company's service, need to use Tomcat, can start Tomcat after the log always error.Java.security.InvalidKeyException:illegal Key Size. Checked, this is a Java plus decryption problem.I followed the

recently, when playing with Eclipse, new projects are all greedy new, with the latest version, in the Dynamic Web Module version column selected the latest version 3.0, the project was the time when the error occurred, the Internet to see other

The Java Read properties file contains two main types of Chinese characters:1.key contains Chinese characters (which may also be included in value)2.key does not contain Chinese characters (it is possible to include in value)1. Key contains Chinese

Given a collection of intervals, merge all overlapping intervals.For example,Given [1,3],[2,6],[8,10],[15,18] ,Return [1,6],[8,10],[15,18] .Problem solving idea One:Using two pointers startindex and endindex to maintain the position of the start and

Branch statements1) If...else ... Branch① alone if statement, not in conjunction with elseSyntax: if (Boolean expression) {statement block;}The following code ...Operation: When the Boolean expression is set, the statement block is executed, and the

Java:In different systems, the path delimiter is different, so we need to make a judgment, and switch the delimiter;The ReplaceAll method in the string class is as follows:String.replaceall (String regex,string replacement), the ReplaceAll () method

Drawing of change interval time series Reports In addition to a fixed Statistical Chart, report development sometimes needs to generate a Statistical Chart that needs to be changed based on different data of different conditions. Images. The key to

Intellij format java and xml, intellijjavaxml During the time when Intellij was used, I have been searching for some skills to continuously improve my proficiency in it. Next, let us know a little bit about how Intellij semi-automated code

In-depth JVM source code compilation Mechanism For jvm source code compilation mechanism, refer to distributed Java application basics and practices. After learning, we will summarize the following.I have no blogs recently, and my mood is