类与对象

class Person
{
 public final String x ="abc";//final 对象不能被修改
 public String name;
 public int age;
 public Person(String name,int age)
 {
  this.name = name;
  this.age = age;
 }
 public void getInfo()
 {
  System.out.println("name ="+name+" ,age="+age);
 }
}
class Student extends Person
{
 public String school;
 public Student(String name,int age)
 {
  super(name,age);
 }
 public Student(String name,int age,String school)
 {
  super(name,age);
  this.school = school; 
 }
 public void study()
 {}
}
class TestStudent
{
 public static void main(String args[])
 {
  Student st = new Student("zhang san",14,"北京大学");
  //st.name = "zhangsan";
  //st.age = 14;
  st.getInfo();
 } 
}