新学的面向对象，虽然很简陋，但是还是有点迷糊

public class Student {
    String name;
    String id;
    int age;
    
    public void zhuTou() {
        System.out.println("你是个猪头！");
    }
    public void shaZi() {
        System.out.println("你是个傻子");
    }
    

}

public class Draft04 {
    public static void main(String[] args) {
        Student s=new Student();
        s.name="猪头";
        s.id="123456";
        s.age=18;
        Student s2=new Student();
        s2.age=20;
        s2=s;
        System.out.println(s.age);
        s.zhuTou();
    }
}