Check the option to Accept License Agreement, and select the download file. "jdk-8u60-windows-x64.exe" in my case.
Run the downloaded file after download completed. And follow the steps.
After installed JDK, you have to set Path to it.
To set path, search "Environment Variables", click "Edit the system environment variables".
Click on "Environment Variables..."
Select and edit Path
Add the path of the bin folder of your JDK, "C:\Program Files\Java\jdk1.8.0_60\bin" in my case.
After path set, you can run javac in command prompt.