1,新建Application类，作为程序的入口
package oop.demo02;
public class Application {
public static void main(String[] args) {
//类，抽象的，需要实例化
Student xiaoming = new Student();
System.out.println("xiaoming.name:\t" + xiaoming.name);//xiaoming.name: null
System.out.println("xiaoming.age:\t" + xiaoming.age);//xiaoming.age: 0
Student xiaoxiao = new Student();
xiaoxiao.name="小不";
xiaoxiao.age=18;
System.out.println("xiaoxiao.name:\t"+xiaoxiao.name);//xiaoxiao.name: 小不
System.out.println("xiaoxiao.age:\t"+xiaoxiao.age);//xiaoxiao.age: 18
}
}
2,新建Student类
package oop.demo02;
//学生类；
public class Student {
//属性
String name; //默认为null
int age;//0
//方法
public void study(){
System.out.println(this.name+"在学习！！！");
}
}
3,运行结果
