引用传递及基本应用---一对一关系

class Person{private int age;private String name;private Book book;public Person(String name, int age){this.setName(name);this.setAge(age);}public String getName(){return name;}public void setName(String name){this.name = name;}public int getAge(){return age;}public void setAge(int age){this.age = age;}public Book getBook(){return book;}public void setBook(Book book){this.book = book;}}class Book{private float price;private String title;private Person person;public Book(String title, float price){this.setTitle(title);this.setPrice(price);}public String getTitle(){return title;}public void setTitle(String title){this.title = title;}public float getPrice(){return price;}public void setPrice(float price){this.price = price;}public Person getPerson(){return person;}public void setPerson(Person person){this.person = person;}}public class OneToOne{public static void main(String []args){Person p = new Person("Mary",18);Book b = new Book("别相信任何人",25.0f);p.setBook(b);b.setPerson(p);//方法后面必须跟"()"System.out.println("从人找书：\n"+"人名："+p.getName()+"\t年龄："+p.getAge()+"\n书名："+p.getBook().getTitle()+"\t书的价格："+p.getBook().getPrice());System.out.println("从书找人：\n"+"书名："+b.getTitle()+"\t书的价格："+b.getPrice()+"\n人名："+b.getPerson().getName()+"\t年龄："+b.getPerson().getAge());}}

运行结果：