HashMap图书馆案例

package tushu;

import java.util.HashMap;
import java.util.Map;

public class TestBook {
    public static void main(String[] args) {
Book b=new Book("iso2000", "java编程思想", "james", 98);
Book b1=new Book("iso2001", "解忧杂货铺", "冬夜硅谷", 38);        
Book b2=new Book("iso2002", "追风筝的人", "凤思夫斯基", 48);        
Book b3=new Book("iso2003", "你让若成风", "李大仁", 28);                
        
Map<String,Book>map=new HashMap<String, Book>();        
        map.put(b.getBookno(), b);
        map.put(b1.getBookno(), b1);
        map.put(b2.getBookno(), b2);
        map.put(b3.getBookno(), b3);
        System.out.println(map.get("iso2001"));
        Book bb=map.get("iso2001");
        bb.setBookName("美术鉴赏");
    System.out.println(b1);
        
    System.out.println(map.get("iso2001"));    
        
    }

}

package tushu;

public class Book {
String bookno;
String bookName;
String author;
int price;
public String getBookno() {
    return bookno;
}
public void setBookno(String bookno) {
    this.bookno = bookno;
}
public String getBookName() {
    return bookName;
}
public void setBookName(String bookName) {
    this.bookName = bookName;
}
public String getAuthor() {
    return author;
}
public void setAuthor(String author) {
    this.author = author;
}
public int getPrice() {
    return price;
}
public void setPrice(int price) {
    this.price = price;
}
public Book(String bookno, String bookName, String author, int price) {
    super();
    this.bookno = bookno;
    this.bookName = bookName;
    this.author = author;
    this.price = price;
}
@Override
public String toString() {
    return "Book [bookno=" + bookno + ", bookName=" + bookName + ", author="
            + author + ", price=" + price + "]";
}
    
    
    
    
    
}