Minecrat doesn't connect and I can't enter my worlds in offline mode

Put the summary of the bug you're having here
Minecrat doesn't connect and I can't enter my worlds in offline mode
What I expected to happen was...:
Describe what you thought should happen here
I thought my java is not working so I re-installed it but this problem still affecting
What actually happened was...:
Describe what happened here
The problem still continued without fixing
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...