4 阅读程序,写出运行结果 class Student{ private String name; public static int age=20; public Student(String name){ this.name=name; age++; } public void show(){ System.out.println("name="+name+",age="+age);} } public class t{ public static void main(String []args){ Student s1=new Student(" 张同学 "); s1.show(); Student s2=new Student(" "); s2.show(); s1.show(); } }