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java从入门到精通(Java from entry to mastery).doc
java从入门到精通(Java from entry to mastery)
Java from entry to master, a netizens post, written very good (-)
Pretty good. Look at the handle
Java Learning Path (a), tools
JDK (Java Development Kit)
JDK is the core of the entire Java, including the Java environment (Java Runtime Envirnment), a stack of Java tools and the Java based class library (rt.jar). No matter what the Java application server is, its essentially a built-in version of JDK. Therefore, mastering JDK is the first step to learn Java well. JDK is the most mainstream Sun company released JDK, in addition to Sun, there are many companies and organizations have developed their own JDK, such as IBM JDK company, BEA company Jrocket, also developed by GNU JDK and so on. Among them, the JVM of IBM JDK (Java Virtual Machine) runs much more efficiently than the Sun JDK contained in JVM. And the Jrocket running on the X86 platform is much better than the Sun JDK in the server. But anyway, we still need to master Sun JDK first.
1, JDK download and install
JDK is also called J2SE (Java2 SDK Standard Edition), can [url]h++p:///j2se/downloads.html[/url] from the Java web site to download the Sun, JDK, the latest version is J2SDK1.4.2, it is recommended to download this version of the JDK download page here: [url]h++p:// /j2se/1.4.2/download.html[/url].
The downloaded JDK is an executable installer,
After the default installation, you will install a set of JRE (used for browsers) in the C:\Program Files\Java\ directory, and install a set of JDK (including a set of JRE) under C:\j2sdk1.4.2. Then we need to increase the Java path C:\j2sdk1.4.2\bin at the front of the environment variable PATH. So the JDK is installed.
2, JDK command tool
The most important command line tool for JDK:
Java: start JVM to execute class
Javac:Java compiler
Jar:Java packaging tool
Javadoc:Java document generator
These command lines must be very, very familiar with each parameter and be very proficient in it. For the learning of these commands,
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