A: jdk1.8 download
Baidu search jdk1.8 click on the red box shown in Fig.
Click on the red box to complete the download
Two: jdk1.8 installed
Double-click the downloaded jdk1.8 enter the installation page
Remember to modify the installation path
May occur during the installation of the following circumstances (which can be ignored if it does not appear)
Here I am in d: jdk1.8 folder prompted this folder is not empty, please select an empty folder
Here I am in d: folder created a new empty folder jdkgengxin jdk1.8 file, then click Next
Three: jdk1.8 Configuration
Select Environment Variables
Click the New button under System Variables
New System Variable: variable name: JAVA_HOME (on behalf of your JDK installation path), the value corresponds to the installation path of your JDK. Click the OK button
New system variables: Click the New button to continue the system variables, a new CLASSPATH variable, which variable values as shown below: variable name: CLASSPATH variable values:;.% JAVA_HOME% \ lib \ dt.jar;% JAVA_HOME% \ lib \ the tools.jar; Note that the variable value of the point in front of the English symbols
Modify system variables: find the name of the system variables for the click Edit Path
Click New to add the red part of the figure to the last line% JAVA_HOME% \ bin;% JAVA_HOME% \ jre \ bin; then has been click OK.
Verify: java version java -version detection, wherein the following "1.8.0_201" as the jdk: WINDOWS + R keys, enter cmd, enter the command-line interface, input
Validation: the input detecting jre javac successful installation is arranged as shown in FIG failure if
Appears above tips is configured incorrectly, click New to create a user variable name in the user's PATH variable to uppercase value% JAVA_HOME% \ bin;
之后 WINDOWS+R键，输入cmd，进入命令行界面，直接输入：javac 若是如图所示，那么就是代表jre安装成功了
之后再次输入 java 若是如图所示，代表jdk安装成功了
这三种验证若是都通过了 就说明jdk下载安装配置成功了。