public class Person {
	private int age ;
	private String name ;
	private Book book ;//一個人有一個書
	private Person child ;//一個人有一個孩紙

	public Person(int age, String name) { //構造函數(shù)
		super();
		this.age = age;
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Book getBook() {
		return book;
	}
	public void setBook(Book book) {
		this.book = book;
	}
	
	public Person getChild() {
		return child;
	}
	public void setChild(Person child) {
		this.child = child;
	}
}

public class Book {
	private String title ;
	private double price ;
	private Person person ; //一本書屬于一個人
	
	public Book(String title, double price) {
		super();
		this.title = title;
		this.price = price;
	}
	
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	public Person getPerson() {
		return person;
	}
	public void setPerson(Person person) {
		this.person = person;
	}
}

public class RefTest {

	/**
	 * @param args
	 * 對象之間的引用傳遞
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Person per = new Person(30,"張三") ;
		Person cld = new Person(10,"張草") ;
		Book bk = new Book("JAVA開發(fā)實戰(zhàn)經(jīng)典",30.3) ;
		Book b = new Book("一千零一夜",10.3) ;
		
		per.setBook(bk) ;//設置兩個對象之間的關系,一個人擁有一本書
		bk.setPerson(per) ;//設置兩個對象之間的關系,一本書屬于一個人
		cld.setBook(b) ; //一個孩紙有一本書
		b.setPerson(cld) ;//一個書屬于一個孩紙
		per.setChild(cld) ;//一個人有一個孩子
		
		System.out.println("從人找到書————————>姓名:"+per.getName()+",年齡:"+per.getAge()+",書名:"
				+per.getBook().getTitle()+",價格:"+per.getBook().getPrice());
		System.out.println("從書找到人————————>書名："+bk.getTitle()+",價格:"+bk.getPrice()+",姓名:"
				+bk.getPerson().getName()+",年齡:"+bk.getPerson().getName());
		//通過人找到孩紙，并找到孩紙擁有的書
		System.out.println(per.getName()+"的孩紙————>姓名:"+per.getChild().getName()+",年齡:"
				+per.getChild().getAge()+",書名:"+per.getChild().getBook().getTitle()+
				",價格:"+per.getChild().getBook().getPrice());
	}

}