Can I have multiple versions of Java installed?

Related questions

1. Can I have two versions of JDK?
2. What is difference between JRE and JDK?
3. Where is JDK installed in Ubuntu?
4. Can you downgrade Java?
5. Can I install same JDK version two times in my machine?
6. Can I install only JRE in my machine?
7. Can I install multiple JRE versions in my machine?

Tags

1. #computer
2. #version
3. #machine
4. #installation
5. #different
6. #found
7. #requirements
8. #installed
9. #tools
10. #command
11. #versions
12. #multiple
13. #package
14. #sometimes