How do I know if I have JDK installed?

Related questions

1. What is JVM JDK JRE in Java?
2. What is the latest version of JDK?
3. Is JRE and JDK same?
4. What is JDK JRE JVM and JIT?
5. Do I need JRE or JDK for Eclipse?
6. Can we install JRE without JDK?
7. Does Java SE include JDK?
8. Is Eclipse a JDK?
9. Where is Java EXE located?
10. Does Java compile need JDK?

Tags

1. #check
2. #start
3. #environment
4. #listed
5. #prompt
6. #system
7. #correctly
8. #panel
9. #command
10. #features
11. #version
12. #advanced
13. #variables
14. #installed
15. #control
16. #there
17. #program