Sal questions

• Unknown compilation error with generics in Java
• Understanding Generics in Object Initialization
• Synchronizing method or entire queue?
• Adding components in GUI upon repaint method
• Factory Design pattern and keyword 'new'
• Standard visibility for abstract methods
• Notation for logic in Java
• Properly using the singleton design pattern
• Weird reference passing in class construction
• Appropriately backing a case insensitive map

Sal answers