How do I know if I have Java JDK installed?

Related questions

1. What is the use of Java Runtime Environment?
2. Is JRE required to run any Java program?
3. Can JRE compile Java code?
4. Is Javac part of JVM?
5. Which JRE will be used while compiling the Java source file?
6. Is Javac part of JDK?
7. What is the role of JRE in Java?
8. Does JDK includes JRE?
9. What is JRE JDK and JVM in Java?
10. Can we run Java program without JVM?

Tags

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