You can see part 1 here, part 2.1 here, part 2.2 here, part 2.3 here, part 2.4 here, part 2.5 here, part 2.6 here, part 2.7 here and part 2.8 here.
We can now mark the class with static modifier to declare that this class has no state. We need this type of classes for utility classes like Syst...
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