1.Java language understanding:
Java language was first created by the SUN, 1991, the company's green SUN project, Oak, and later followed by SUN and Oracle has released java1.0,1.1,1.2,1.3,1.4 and 5.0, 6.0, 7.0, 8.0 and so on.
2, Java's main purposes:
- Internet: electricity supplier, p2p etc.
- Enterprise applications: ERP, CRM, BOS, OA, etc.
Features 3.Java language
Simple and efficient, object-oriented, platform-independent nature, once, run everywhere.
For different platforms
Composition structure 4.java language
jdk: java development kit contains the jre and development tools.
jre: java runtime environment includes jvm and java core class libraries (java api)
jvm: Java Virtual Machine
Summary: For the Java installation, we only need to jdk, which contains the java runtime environment and virtual machines.
Another: jdk download:
1) to obtain jdk files via Oracle's official website: http: //www.oracle.com
For different operating systems, you need to download the corresponding version of jdk.
Download specific steps can refer to "jdk download and install documentation"
2) installation process
Just click install Next, as to modify the default installation directory, as a programmer, it is recommended that the papers were in each path is clear, so that later it is also easy to create a directory and try not to use the space during Chinese .
3) .jdk installation directory profile:
| Explanation | |
|---|---|
| bin | The path is stored under the command of the JDK tools. javac and java on this directory. |
| conf | The path to store the JDK under the relevant configuration file. |
| include | The path is stored under a number of platform-specific header file. |
| Jmods | The path is stored at the various modules JDK. |
| legal | The path is stored under the authorization document JDK each module. |
| lib | The path is stored under a number of additional JAR package JDK tools. |