1. All OOPs concept. 2. Collection 3. Map 4.differece between ArrayList and Linked List 5. Access Modifier 6. difference between Throws and Throw 7. Programming to reverse string and iterate Map.

1. All OOPs concept. 2. Collection 3. Map 4.differece between ArrayLis

1.	1. All OOPs concept. 2. Collection 3. Map 4.differece between ArrayList and Linked List 5. Access Modifier 6. difference between Throws and Throw 7. Programming to reverse string and iterate Map.
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