What is the connection between hashcode and equals methods in Java?
What happens if you are working with a HashSet and override the hashcode method to always return some value?
REST services: what is the difference between PUT and POST?
Do you have experience with XP/ TDD?

Question

What is the connection between hashcode and equals methods in Java? 
What happens if you are working with a HashSet and override the hashcode method to always return some value?
REST services: what is the difference between PUT and POST?
Do you have experience with XP/ TDD?

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