Lew Bloch questions

Lew Bloch answers

• lambda expressions not working in netbeans jdk 1.8 project [duplicate]
• Retrieve array[] of values from ArrayList of objects
• What did Java programmers do before Java 8 if they wanted to pass a function around?
• Nested enum is static?
• Java - Why declare an array as a type of Interface?
• Java - unmodifiable key set map
• Should DTOs use inheritance or composition
• What is the Concrete class in java
• Passing an ArrayList of subclass to a constructor that takes ArrayList of superclass?
• which is faster, creating new variable vs reusing old variable?