Java一对一关系

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class Person
{
private String name;
private int age;
private Book book;
public Person(String name,int age)
{
  this.setname(name);
  this.setage(age);
}
public void setname(String n)
{
  name=n;
}
public String getname()
{
  return name;
}
public void setage(int m)
{
  age=m;
}
public int getage()
{
  return age;
}
public Book getbook()
{
  return book;
}
public void setbook(Book a)
{
  book=a;
}
}
class Book
{
private String title;
private float price;
public Person person;
public Book(String title,float price)
{
  this.settitle(title);
  this.setprice(price);
}
public void settitle(String q)
{
  title=q;
}
public String gettitle()
{
  return title;
}
public void setprice(float p)
{
  price=p;
}
public float getprice()
{
  return price;
}
public Person getperson()
{
  return person;
}
public void setperson(Person m)
{
  person=m;
}
}
public class test18 {
public static void main(String args[])
{
  Person per=new Person("张三",20);
  Book bk=new Book("helloworld",90);
  per.setbook(bk);
  bk.setperson(per);
  System.out.println("姓名:"+per.getname()+"\t年龄:"+per.getage()+"\t书名:"+bk.gettitle()+"\t价格:"+bk.getprice());
}

}