44 面向对象编程

类 是一组相关属性和行为的集合

对象 是该事物的具体体现

class Dem1_Student{
    public static void main(String[] args) {
        Student s = new Student();
        s.name = "张三";
        s.age = 23;
        System.out.println(s.name+s.age);
        s.sleep();
    }
}// 测试类

class Student{

    String name;
    int age;
    String gender;

    public void study(){
        System.out.println("study....s");
    }

    public void sleep(){
        System.out.println("sleep....");
    }



}   //基本类