Can I have two versions of JDK?

Related questions

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

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