7 阅读程序,写出运行结果 class Student{ String stuName=" 学生 "; static int No=0; public Student() {No++; System. out .println(stuName+No);} public Student( int a) {No=a; System. out .println(stuName+a);} public void show(){ System. out .println(stuName+No); } } class Demo { public static void main(String[] args) { Student st1= new Student(); st1.show(); Student st2= new Student(2); st2.show(); st1.show(); }}