0 basic Android Development Java language Learning 02-java development platform Building

Window System install Java download JDK

First we need to download the Java SDK jdk,:http://www.oracle.com/technetwork/java/javase/downloads/index.html, click the download button below:

In the download page you need to choose to accept the license and choose the corresponding version according to your system (everyone's operating system is not the same), this article takes the Window 64-bit system as an example:

After downloading the JDK installation according to the prompts, as well as installing the JDK will also install the JRE, installed on it.

Install the JDK, you can customize the installation directory and other information, such as we choose to install directory C:\Program Files (x86) \java\jdk1.8.0_91.

Configuring Environment variables

1. After the installation is complete, right click on "My Computer", click "Properties", select "Advanced System Settings";

2. Select the "Advanced" tab and click on "Environment variables";

The screen will then appear as shown:

Set 3 properties in "System variable", Java_home,path,classpath (case does not matter), if already exist then click "Edit", not exist then click "New".

The variable setting parameters are as follows:

• Variable name:java_home
• Variable value:C:\Program Files (x86) \java\jdk1.8.0_91 //To be configured according to your actual path

• Variable name:CLASSPATH
• Variable value:.;          %java_home%\lib\dt.jar;%java_home%\lib\tools.jar; Remember, there's a "." in front.

• Variable name:Path
• Variable value:%java_home%\bin;%java_home%\jre\bin;

Java_home settings

Path settings

CLASSPATH settings

This is the Java environment configuration, after the configuration is complete, you can start Eclipse to write code, it will automatically complete the configuration of the Java environment.

Note: If you use more than 1.5 versions of the JDK, you can compile and run the Java program normally without setting the CLASSPATH environment variable.

Test whether the JDK was installed successfully

1, "Start", "Run", type "cmd";

2, type the command: java-version,java,javac Several commands, the following information appears, indicating that the environment variable configuration is successful;

Popular Java Development tools

The so-called 工欲善其事 its prerequisite, we in the development of the Java language process also requires a good development tool, the current market of the IDE a lot

• Eclipse (Recommended): Another free open source Java IDE,: http://www.eclipse.org/

  Select Eclipse IDE for Java developers:

Follow the prompts to download and install eclipse;

After opening eclipse, there will be workspace (where the code is stored) with the following hints:

Second, create an arbitrarily named project as follows:

Third, click on the project below the SRC directory popup right click to create a class file as follows:

Enter the main function and run the project as follows:

Final Result:

0 basic Android Development Java language Learning 02-java development platform Building