java - 面向对象思考问题的方法

Question

我学了C语言，他是面向过程的。
我在学习面向对象时，发现和面向过程思考问题很多地方不一样，考虑现实中的问题。
请大家说一下你们是怎么思考面向对象的问题。

谢谢大家

Answer 1

C is a process-oriented language, and methods defined in the code are generally called all the time; in object-oriented languages ​​​​(such as Java) or object-oriented languages ​​​​(such as JavaScript), methods are defined on objects or classes. (ps: There is no clear explanation of classes in js). For example, there is a method to compare sizes:

In C language:

int compare(int num1,int num2){
     return num1>num2?num1:num2;
}

//调用
compare(1,2);

In Java

public class Compare{
     private int num1;
     private int num2;

     public Compare(int num3,int num3){
              this.num1=num3;
              this.num2=num4;
     }

     public int com(){
               return this.num1>this.num2?this.num1:this.num2;
     }
}

//调用
Compare cpm = new Compare(5,6);
System.out.println(cpm.com());

The above is a simple example to distinguish the different ways of thinking about the same problem between process-oriented and object-oriented. Although there is no outstanding point of being object-oriented here, in actual projects, there are many methods and a large amount of coding. In this case, classes can organize the code very well. For example, a user has different behaviors such as eating, walking, sleeping, and entertainment.
In C language, the implementation might look like this:

void eating(){}

void walk(){}

void sleep(){}

void entertainment(){}

.......//定义其它方法

In an object-oriented language, the implementation may look like this:

public User{
    void eating(){}

    void walk(){}

    void sleep(){}

    void entertainment(){}

    ....//其它方法
}

Obviously, object-oriented assembles the code structure very well, making it easier to understand. KuKe has an article about understanding object-oriented programming:
Understanding object-oriented programming in this way, I hope it will be helpful to the subject's understanding of object-oriented programming

Answer 2

You can read a Turing book called "This Object-Oriented Programming Book for Everyone".