Java Configuration JDK Development environment and environment variables _java

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1, the installation of JDK development environment

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

To begin 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 it.

2. Configure Environment variables:

For Java program Development, the main use of JDK two commands: Javac.exe, Java.exe. Path: C:\Java\jdk 1.7.0 _09\bin. However, these commands do not belong to Windows own commands, so you need a path configuration if you want to use them.

Click Computer-Properties-advanced system settings, and 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, JDK installation path)
(2) Edit the-> variable name "Path" and add ";%java_home%\bin;%java_home%\jre\bin" at the end of the value of the original variable.
(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 variables are operated as follows:

3, verify that the environment is actually configured:

Enter the java,javac,java-version command separately in the console, and the JDK's compiler information, as shown below, includes 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:

Copy Code code as follows:

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

Written in Notepad, click "Save", and deposited in the C-packing directory, input javac Test.java and Java Test command, you can run the program (print out the result "Hello Java"). Note: These two commands are in the D:\java\jdk1.8.0_20\bin directory.

Program Resolution:

First write Java source Code program, extension. java;

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

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

Note: If you enter Javac Test.java command in cmd, the display ' Javac ' is not an internal or external command, because the JDK development environment or environment variable configuration is not properly installed in advance.

Related Source:

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

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