?? library.java
字號:
import java.util.*;
public class Library{
private List book;
private List borrower;
private HashMap titleBook=new HashMap(100);
private HashMap idBorrower=new HashMap(100);;
public Library(List book,List borrower){
this.book=book;
this.borrower=borrower;
for(int i=0;i<book.size();i++){
Book b=(Book)book.get(i);
titleBook.put(b.getTitle(),b);
}
for(int i=0;i<borrower.size();i++){
Borrower b=(Borrower)borrower.get(i);
idBorrower.put(b.getId(),b);
}
}
/*precondition: id must exist*/
public Borrower getBorrower(String id){
return (Borrower)idBorrower.get(id);
}
public Book getBook(String title){
return (Book)titleBook.get(title);
}
public boolean authenicate(String id){
return idBorrower.containsKey(id);
}
}
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