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class It can inherit to other class only one class. The abstract class needs to use 'override'. interface It can inherit to multiple class. It does not need to use 'override'. Ex) 1. Create the abstract class(parents). (uncompleted method) 2. Create the interface. Using with 'I' in accordance with the custom. (uncompleted method) 3. Create the class(children) which is inherited 1,2. # 1 abstract..

Object : One program consists of several types of logic. This logic can be groupping which consists of associated variables, methods. This is an object. It can be reused, it is a sort of components when it reused. So making a good object means recyclable in other places. For example, the initial computer which every parts such as monitor, harddist, keyboard is combined. But the newest one has ea..