文章标题

package yingshe;
public class book {
private String bookid;
private String bookname;
private String bookauthor;
private double bookprice;
private String bookpress; //出版社
private String bookkind; //类别
private Owners owner; //拥有者
private book[] books;
private Owners[] owners;

public Owners[] getOwners() {
return owners;
}
public void setOwners(Owners[] owners) {
this.owners = owners;
}
public book[] getBooks() {
return books;
}
public void setBooks(book[] books) {
this.books = books;
}
public Owners getOwner() {
return owner;
}
public void setOwner(Owners owner) {
this.owner = owner;
}
public book(String bookid,String bookname,String bookauthor,double bookprice,String bookpress,String bookkind) {
// TODO Auto-generated constructor stub
this.bookid=bookid;
this.bookname=
4000
bookname;
this.bookauthor=bookauthor;
this.bookprice=bookprice;
this.bookpress=bookpress;
this.bookkind=bookkind;
}
public String getBookid() {
return bookid;
}
public void setBookid(String bookid) {
this.bookid = bookid;
}
public String getBookname() {
return bookname;
}
public void setBookname(String bookname) {
this.bookname = bookname;
}
public String getBookauthor() {
return bookauthor;
}
public void setBookauthor(String bookauthor) {
this.bookauthor = bookauthor;
}
public double getBookprice() {
return bookprice;
}
public void setBookprice(double bookprice) {
this.bookprice = bookprice;
}
public String getBookpress() {
return bookpress;
}
public void setBookpress(String bookpress) {
this.bookpress = bookpress;
}
public String getBookkind() {
return bookkind;
}
public void setBookkind(String bookkind) {
this.bookkind = bookkind;
}
public String getInfo(){
return "书的信息为：\n \t"+" id:"+this.bookid+", 书名："+this.bookname+" ,作者："+this.bookauthor+", 价格："+this.bookprice+" ,出版社："+this.bookpress+" ,类别："+this.bookkind;
}
}
package yingshe;

public class Owners {
private String ownerName;
private String ownerId;
private book book;
private book [] books;
private Owners [] owners;
public Owners[] getOwners() {
return owners;
}
public void setOwners(Owners[] owners) {
this.owners = owners;
}
public book[] getBooks() {
return books;
}
public void setBooks(book[] books) {
this.books = books;
}
public Owners(String ownerName,String ownerId) {
// TODO Auto-generated constructor stub
this.ownerName=ownerName;
this.ownerId=ownerId;
}
public String getOwnerName() {
return ownerName;
}
public void setOwnerName(String ownerName) {
this.ownerName = ownerName;
}
public String getOwnerId() {
return ownerId;
}
public void setOwnerId(String ownerId) {
this.ownerId = ownerId;
}
public book getBook() {
return book;
}
public void setBook(book book) {
this.book = book;
}
public String getInfo(){
return "拥有者的信息为：\n \t"+"拥有者的id："+this.ownerId+",拥有者的名字："+this.ownerName;
}

}

package yingshe;
public class bookDemo {

public bookDemo() {
// TODO Auto-generated constructor stub
}

public static void main(String[] args) {
// TODO Auto-generated method stub
bookDemo bookDemo=new bookDemo();
System.out.println("一对一的映射：\n");
//bookDemo.yiduiyi();
System.out.println("一对多的映射：\n");
//bookDemo.yiduiduo();
System.out.println("多对多的映射：\n");
bookDemo.duoduiduo();

}
public void yiduiyi(){
book book=new book("001", "Java核心技术", "沈雪冰", 69.8, "清华大学出版社","程序设计");
Owners owners=new Owners("王源", "9527");
//System.out.println(book.getInfo());//输出书的信息
//System.out.println(owners.getInfo()); //输出拥有者的信息
book.setOwner(owners); //设置书的拥有者
owners.setBook(book); //设置拥有者的书
System.out.println("通过书的拥有者 输出拥有者的信息：\n"+book.getOwner().getInfo()); //通过书的拥有者 输出拥有者的信息
System.out.println("通过拥有者的书 输出书的信息：\n"+owners.getBook().getInfo());//通过拥有者的书 输出书的信息
}
public void yiduiduo(){
book book=new book("001", "java核心技术", "沈雪冰", 69.8, "清华大学出版社","程序设计");
book book1=new book("002", "c核心技术", "沈雪冰", 69.8, "清华大学出版社","程序设计");
book book2=new book("003", "c++核心技术", "沈雪冰", 69.8, "清华大学出版社","程序设计");
book books[]=new book[]{book,book1,book2}; //某人可能拥有这批书

Owners owners=new Owners("王源", "9527");
owners.setBooks(books);
//设置三本书拥有者
book.setOwner(owners);
book1.setOwner(owners);
book2.setOwner(owners);
System.out.println("通过拥有者找出他所拥有的书：");
for(int i=0;i<owners.getBooks().length;i++)
{
System.out.println();System.out.println(owners.getBooks()[i].getInfo());
}
System.out.println("通过书找出拥有者的信息：\n");
for(int i=0;i<owners.getBooks().length;i++){
System.out.println(books[i].getOwner().getInfo());
}

}
public void duoduiduo(){
//定义六本书
book book=new book("001", "java核心技术", "沈雪冰", 69.8, "清华大学出版社","程序设计");
book book1=new book("002", "c核心技术", "沈雪冰", 69.8, "清华大学出版社","程序设计");
book book2=new book("003", "c++核心技术", "沈雪冰", 69.8, "清华大学出版社","程序设计");
book book3=new book("004", "c#核心技术", "沈雪冰", 69.8, "清华大学出版社","程序设计");
book book4=new book("005", "Python核心技术", "沈雪冰", 69.8, "清华大学出版社","程序设计");
book book5=new book("006", "Linux核心技术", "沈雪冰", 69.8, "清华大学出版社","程序设计");
book bookss []=new book[]{book,book1,book2,book3,book4,book5};
book books[]=new book[]{book,book1,book2}; //某人可能拥有这批书
book books1[]=new book[]{book3,book4};//某人可能拥有这批书
book books2[]=new book[]{book2,book4};//某人可能拥有这批书
//定义三个拥有者
Owners owner=new Owners("王源", "9527");
Owners owner1=new Owners("李四", "9528");
Owners owner2=new Owners("张三", "9529");
Owners owners[]=new Owners[]{owner,owner1,owner2};
Owners owners1[]=new Owners[]{owner};
Owners owners2[]=new Owners[]{owner1,owner2};

owner.setBooks(books); //owner拥有books这批书
owner1.setBooks(books1);//owner1拥有books1这批书
owner2.setBooks(books2);//owner2拥有books2这批书
//设置每本书的多位拥有者
book.setOwners(owners);
book1.setOwners(owners);
book2.setOwners(owners2);
book3.setOwners(owners1);
book4.setOwners(owners1);
//book5.setOwners(owners2);

System.out.println("通过书找到书的拥有者：\n");
for(int i=0;i<bookss.length;i++)
{
try {
if(bookss[i].getOwners()!=null)
System.out.println(bookss[i].getInfo()+"\n 拥有者信息：\n");
for(int j=0;j<bookss[i].getOwners().length;j++)

System.out.println(bookss[i].getOwners()[j].getInfo());
} catch (Exception e) {
// TODO: handle exception
System.out.println(bookss[i].getInfo()+"\n还没有拥有者哦~！");
}
}
System.out.println();
System.out.println("通过拥有者找到书的信息：\n");
for(int i=0;i<owners.length;i++)
{
System.out.println(owners[i].getInfo()+"\n 拥有的书的信息：");
for(int j=0;j<owners[i].getBooks().length;j++)
System.out.println(owners[i].getBooks()[j].getInfo());
}

}

}