To download the Java Development Kit (JDK) in 64-bit version, you can visit the Java website at https://www.java.com and click the "Download" button.
On the download page, you will see a list of available downloads, including the latest version of the JDK for Windows, macOS, and Linux. You can choose the download that corresponds to your operating system and follow the instructions to download and install the JDK.
It's important to note that the JDK is available in both 32-bit and 64-bit versions, and you should choose the version that is appropriate for your system. If you are not sure which version to download, you can check the "System type" in the "System" section of the "Control Panel" on Windows or the "About this Mac" window on macOS to determine whether you have a 32-bit or 64-bit system.
Once you have downloaded and installed the JDK, you can use it to develop Java applications and applets. You can also use the JDK to compile and run Java programs on your computer.