面向对象---同一package的调用

package cn.xlf.test;

public class Student {
    //静态的数据
        String name;
        int id; //z学号
        int age;//年龄
        String gender;
        int weight;
        computer computer;
        
        //动态的行为
        public void study(){
            System.out.println(name+"在学习");//直接调用
            System.out.println("他的学号是"+id);
        }
        public void sayHello(String sname){
            System.out.println(name+"向"+sname+"说：你好");
        }
        public static void main(String[] args){
            Student s1 = new Student();//声明并实例化  分配空间
            //赋值
            s1.name="向良峰";
            s1.id = 1731011641;
            s1.study();
            s1.sayHello("维克士");
            
            Student s2 = new Student();
            s2.name = "zbg";
            s2.age = 18;
            s2.study();
            s2.sayHello("维克士");
        }
    
}

package cn.xlf.test;

public class computer {
    String brand;
    int cpuSpeed;

}

 1 package cn.xlf.test;
 2 
 3 public class Test2{
 4     public static void main(String[] args){
 5         
 6         Student s1 = new Student();
 7         s1.name = "向良峰";
 8         s1.age = 20;
 9         
10         computer c = new computer();
11         c.brand  ="DELL";
12         c.cpuSpeed = 2400;
13         
14         s1.computer = c;
15         System.out.println(s1.computer.brand);
16 
17     }
18 }