Java Configuration----JDK development environment Construction and environment variable configuration

Article Source: http://www.cnblogs.com/smyhvae/p/3788534.html

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1. Install the JDK development environment

Download site: http://www.oracle.com/

To start installing the JDK:

Modify the installation directory as follows:

When you are sure, click Next.

Note: When prompted to install the JRE, you can choose not to install.

2. Configure Environment variables:

For Java program Development, the main use of the JDK's two commands: Javac.exe, Java.exe. Path: C:\Java\jdk 1.7.0 _09\bin. However, because these commands are not part of the Windows own commands, you need to configure the path to use them.  

Click Computer-Properties-Advanced system settings, click Environment Variables. Click New under the System Variables column to create a new system environment variable.

(1) New variable name "Java_home", Variable Value "C:\Java\jdk1.8.0_05" (that is, the JDK installation path)
(2) Edit, variable name "Path", at the end of the value of the original variable, add ";%java_home%\bin;%java_home%\jre\bin"
(3) New variable name "CLASSPATH", Variable Value ".; %java_home%\lib;%java_home%\lib\dt.jar;%java_home%\lib\tools.jar "

For example:java_home environment variable operation is as follows:

3, confirm whether the environment configuration is true:

In the console, enter the java,javac,java-version command separately, with the compiler information for the JDK as shown below, including information such as modifying the syntax and parameter options for the command.

Java command:

Javac command:

Java-version command:

4. Verify the first Java program under the console:

public class Test {public    static void Main (string[] args) {        Systerm.out.println ("Hello Java");}    }

Write in Notepad, click "Save", and deposit the C packing directory, enter Javac Test.java and Java Test command, you can run the program (print out the result "Hello Java"). Note: These two commands are under the D:\java\jdk1.8.0_20\bin directory.

Program parsing:

First write the Java source Code program, extension. java;

In command-line mode, enter the command: Javac the source file name. Java, compile the source code, generate a class bytecode file;

After compiling, if there is no error message, enter the command: Java HelloWorld, the class bytecode file interpretation run, do not need to add the. class extension. See:

Note: If you enter the Javac test.java command in CMD, the display of ' Javac ' is not an internal or external command because the JDK development environment or environment variable configuration is not installed in the wrong place.

Related Source:

SOURCE Location: D:\java\jdk1.8.0_20\src.zip

Java Configuration----JDK development environment Construction and environment variable configuration