1. Download and install JDK
If you want to run eclipse, you must first have a Java operating environment, so we must first download the JDK. Enter the URL in Google browser: java.oracle.com, find Top Download, and click Java SE.
Click Accept License Agreement and download the JDK that suits your computer version. Since my computer is Windows 10 64-bit Professional Edition, I chose the last one.
Click the red download button. You decide the save location yourself, as long as you can find it when you install it.
2. Find the installation file and double-click it.
#3. Next, you will be asked to choose the installation directory.
Note: It is best not to choose the source installation directory, because if you find that the Program Files contain spaces, errors may occur when compiling java software in the future, and you will not be able to find the problem for a while, so take precautions Otherwise, it is recommended to install it in another directory. I personally choose to create a new file on the D drive and call it Java, open the Java folder, and create two new folders inside, one called jdk and one called jre.
4. Return to the original installation interface and change the installation directory to the newly created jdk file. Click Next.
#5. After installing jdk, the jre installation interface will pop up. Here select the installation path to the newly created jre folder.
6. Click Next. After that, both jdk and jre were installed successfully. Click Close.
#7. Test whether jdk is installed successfully. Here I will teach you a shortcut key. Windows R opens the running interface. Enter cmd to open the dos system.
8. Click Run. Enter java. If the following content is displayed, the installation is successful.
11. Click Advanced, then click Environment Variables.
12. Create a new system variable JAVA_HOME and fill in D:\Java\jdk as the variable value. (This is the installation path of my jdk. If you install it on other disks, you can find the jdk. Just copy the installation path into it)
13. Find the Path in your system variable, double-click it, find the edit text, click it, and add ;%JAVA_HOME%\ at the end of the variable value bin;%JAVA_HOME%\jre\bin
14. Create a new system variable CLASSPATH and fill in the variable value .;%JAVA_HOME%\lib;%JAVA_HOME%\lib\dt. jar;%JAVA_HOME%\lib\tools.jar (note that there is a dot in front of this variable value, which means starting from the current path)
15. Click OK, now come Test whether the following javac can be used. Open the run with Windows R key, enter cmd, open the dos system, enter javac.
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