多态与接口 题5、6静态变量函数的使用

class student等同于c的一个结构体。里面包含静态变量，含义类似于c++。
静态变量用法：

package zuoye65;
class Student {
	static String schoolName;
	static String country = "中国";
}
public class Example12 {
	public static void main(String [] args){
		Student stu1 = new Student();
		Student stu2 = new Student();
		Student.schoolName = "传播智客";
		System.out.println("我的学校是"+stu1.schoolName);
		System.out.println("stu1的国家是"+stu1.country);
		System.out.println("我的学校是"+stu2.schoolName);
		System.out.println("stu2的国家是"+stu2.country);
	
	}
}

静态函数用法：

package zuoye66;
class Person{
	public static void sayHello(){
		System.out.println("hello");
	}
}
public class Example13 {
	public static void main(String []args){
		Person.sayHello();
		Person a1 = new Person();
		Person a2 = new Person();
		a1.sayHello();
		a2.sayHello();
	}
}