How the object oriented approach helps us keep complexity of software development under control?

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How the object oriented approach helps us keep complexity of software development under control?

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We can discuss such issue from the following aspects:

Objects allow procedures to be encapsulated with their data to reduce potential interference.
Inheritance allows well-tested procedures to be reused and enables changes to make once and have effect in all relevant places.
The well-defined separations of interface and implementation allow constraints to be imposed on inheriting classes while still allowing the flexibility of overriding and overloading.

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How the object oriented approach helps us keep complexity of software development under control?
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