- NOTE: The question is not about the difference between JDK and JRE.
Oh, I am sorry. The question is not discuss about JDK and JRE. But I cannot express clearly in my title. So I try to explain in here.
I want to know the difference between two folders!
C:\Program Files\Java\jdk1.8.0_161\jre and C:\Program Files\Java\jre1.8.0_161
Describe in details:
I am new to JAVA. I have installed the JDK in my Windows 10. When I install jdk, there were two steps. After double click jdk-8u161-windows-x64.exe, two steps as follows:
Step 1: install jdk. (In
C:\Program Files\Java\jdk1.8.0_161)Step 2: install jre. (In
C:\Program Files\Java\jre1.8.0_161)
But when I open the jdk1.8.0_161 folder. I can also find a jre folder.
Could anyone tell me the difference between C:\Program Files\Java\jdk1.8.0_161\jre and C:\Program Files\Java\jre1.8.0_161?
If they are the same, why is jre installed in the installation process of jdk ? Are they duplicated?
In other world, is Step 2 needless?
The JRE within the JDK C:\Program Files\Java\jdk1.8.0_161\jre (also referenced as private JRE) is used by the JDK tools. The JRE outside C:\Program Files\Java\jre1.8.0_161 (also referenced as the public JRE) should is meant to be used by the Java applications.
private JRE
- contains the library (attach.dll) needed for the use of the attach API
- will be uninstalled with the JDK
public JRE
- registers the Java Plug-in and the java web start in the browsers
- this JRE is registered in the system, e.g. as runtime for Java applications, the Java control panel
- can be uninstalled separately from JDK