Introduction to Object-oriented (Object oriented) programming in Java

A program consists of two parts: a function of data and operation data;

The process-oriented design approach is the Top-down function decomposition,

Decompose a requirement into multiple subfeatures, develop subfeatures and unit tests, and assemble them into a complete application;

Problem:

1. The program focuses on functions, followed by data, and data flows from one function to another function;

2. Data structure needs to run through multiple functions;

3. Modify the data structure, will cause the chain reaction in the procedure;

4. Data integrity error, may occur in multiple functions, there are bugs, not easy to find;

The object-oriented design method is the design object, the main improvement:

1. The main concern data structure, second is the function;

2. The data structure is encapsulated in the object, only needs to be used by the object;

3. Change the data structure, only need to modify the internal structure of the object, does not produce a chain reaction;

4. Each object is responsible for ensuring the integrity of their data, isolate bugs;

Object-oriented solves the problem of process-oriented.

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