2023.7.22 周六：封装

//类
public class Student {
   private String name;
    private int age;
    public void setName(String name)
    {
        this.name = name;
    }
    public String getName()
    {
        return this.name;
    }
    public Student(){}//默认构造
    public void say(){
        System.out.println(this.name+"在说话");//this指针的调用
    }
}
//main
public class Main {
    public static void main(String[] args){
    Student s1 = new Student();
    s1.setName("不良帅");
    String name = s1.getName();
    System.out.println(name);
    }
}
//用private封装
//用get()和set()来提供设置和获取接口
//alt+insert 选中get,set可以自动添加