Java-类与对象的关系

//学生类
public class Student {
    //属性：字段
    String name;
    int age;

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

}

//一个项目应该只存一个main方法
public class Application {
    public static void main(String[] args) {
        //类:抽象的，实例化
        //类实例化后会返回一个自己的对象!
        //student对象就是一个student类的具体实例!
        Student xiaoming = new Student();
        Student xiaohong = new Student();

        xiaoming.name="小明";
        xiaoming.age=18;

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

        xiaohong.name="小红";
        xiaohong.age=17;

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

    }
}