类与对象的创建

类与对象的创建

package zaiyang.oop.demo02;
//学生类
public class Student {

    //属性：字段
    String name;//null
    int age;//0

    //方法
    public void study(){
        System.out.println(this.name+"在学习");
    }
}

package zaiyang.oop.demo02;
//一个项目应该只存在一个main方法
public class Application {
    public static void main(String[] args) {

        //类：抽象的，要实例化
        //类实例化后会返回一个自己的对象!
        //student对象就是Student类的具体实例！

        Student xiaoming = new Student();
        Student xh = new Student();

        xiaoming.name = "小明";
        xiaoming.age = 3;

        System.out.println(xiaoming.name);
        System.out.println(xiaoming.age);

        xh.name = "小红";
        xh.age = 4;

        System.out.println(xh.name);
        System.out.println(xh.age);



    }
}