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Code Complete has asked 20 questions and find answers to 3 problems.

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Code Complete questions

Why is 7 / 3 not always an int? Why can it be assigned into byte or short while x/3 cannot? [duplicate]
Cast to generic type (T) is never checked by the compiler?
Why cannot use this while calling static interface method from default interface method? [duplicate]
Why subsignature and unchecked rules work this way on return types when overriding a generic method with a non-generic one?
Why can static and default interface methods not be synchronized but can be strictfp? [duplicate]
Why does int p = (p=1) + p; fail in field definitions but is OK within method?
Code Example of "obscuring" as per JLS (6.4.2. Obscuring), especially this "local variable or type can obscure a package"
What is JUnit5 Platform Launcher exactly?
Execution order of f1() + f2()*f3() expression and operator precedence in JLS
Arrow (->) operator precedence/priority is lowest, or priority of assignment/combined assignment is lowest?

Code Complete answers

Code Example of "obscuring" as per JLS (6.4.2. Obscuring), especially this "local variable or type can obscure a package"
Why ArrayList add() and add(int index, E) complexity is amortized constant time? Why not O(1) for add(), O(n) for add(int index, E)? [duplicate]