Question

Java- arraylist用在 不同的class

如果
public A{ArrayList<LibraryBook> array= new ArrayList<LibraryBook>();
}
public B{ArrayList<Book> booklist = new ArrayList<Book>();
}
如何在B中把booklist的值传给A中的array

Answer 1

public A{
ArrayList<LibraryBook> array= new ArrayList<LibraryBook>();
A(){
ArrayList<Book> booklist = B.booklist;
for(int i = 0; i < booklist.size(); i ++){
array.add((LibraryBook)(booklist.get(i)));
}

}
}

------------------------------------
public B{
public static ArrayList<Book> booklist = new ArrayList<Book>();
}