public class FieldDemo { 
  public static void main(String[] args){ 
    Student t = new Student("Jack"); 
    Person p = t;//父类创建的引用指向子类所创建的对象  
    System.out.println(t.name+","+p.name); 
    System.out.println(t.getName()+","+p.getName()); 
  } 
 
} 
class Person{ 
  String name; 
  int age; 
  public String getName(){ 
    return this.name; 
  } 
} 
class Student extends Person{ 
  String name; // 属性和父类属性名相同，但在做开发时一般不会和父类属性名相同！！  
  public Student(String name){ 
    this.name = name; 
    super.name = "Rose"; // 为父类中的属性赋值  
  } 
  public String getName(){ 
    return this.name; 
  } 
}