student2_ex.java

非常好的JAVA学习资料

class Person2
{ protected String name;
  protected int age;
  public Person2(String na,int ag)
  {name=na;age=ag;}
  public void olderoryanger(Person2 p)
  {int d;
   d=this.age-p.age;
   System.out.print(this.name +" is ");
    if(d>0)System.out.println("older then "+p.name);
    else if(d==0)System.out.println("as "+p.name);
         else System.out.println("yanger then "+p.name);}
  public void print()
  { System.out.println("The object of "+this.getClass().getName()+":   "+name+","+age);}
 }
class Student2 extends Person2
{ String address;
  String department;
  public Student2(String na,int ag,String ad,String de)
  {super(na,ag);
   address=ad;
   department=de;
      }
   public void print()
   {super.print(); 
    System.out.println("    the other information of student:"+address+","+department);}
}
public class Student2_ex
{public static void main(String args[])
 {Person2 pe=new Person2("Tom",20);
  Student2 st=new Student2("Jhon",19,"336 West Street","Computer");
  pe.print();
  st.print();
  pe.olderoryanger(st);
 }
}