我正在尝试使用Java制作图书馆借阅系统
尝试对函数内部的arraylist使用循环我得到错误
无法静态引用非静态字段b
无法从类型库中静态引用非静态方法借书（String）
当我将所有内容放入评论之类的主要内容中
这是Book类代码
package Book;
public class Book {
/********************************/
public String author;
public String title;
public int numcopies;
public Book() {};
public Book(String author, String title, int
numcopies) {
this.author = author;
this.title = title;
this.numcopies = numcopies;
}
/*********************************/
/***********************************/
public void setAuthor(String auth)
{
author = auth;
}
public void setTitle(String t)
{
title = t;
}
public void setNum(int n){
numcopies = n;
}
/********************************/
public String getAuthor()
{
return author;
}
public String getTitle()
{
return title;
}
public int getNum(){
return numcopies;
}
/********************************/
public String Display()
{
return "\nAuthor: " +author + "\nTitle: " +title +
"\nNumber Of Copies " +numcopies +"\n ";
}
}
这是包含方法的库代码
package Book;
import java.util.ArrayList;
public class Library {
public ArrayList<Book> b = new ArrayList<>();
public static void main(String[] args) {
// TODO Auto-generated method stub
/*
ArrayList<Book> b = new ArrayList<>();
Book a = new Book("author","title",5);
b.add(a);
Book x = new Book("author1","title1",6);
b.add(x);
*/
/*
for (Book BIteration:b ) {
System.out.println(BIteration.Display());
}
*/
Book x = new Book("title","author",6);
b.add(x);
borrowBook("author");
}
public void addBook(Book book)
{
b.add(book);
}
public void borrowBook(String title)
{
int found = 0;
for (Book c:b )
{
if (c.getTitle().equals(title))
{
if(c.getNum() != 0 ) {
found = 1 ;
int m = c.getNum();
m--;
System.out.println("Good News, You can borrow this book.");
}
else {
System.out.println("Sorry, this book is already borrowed.");
}
}
}
if (found == 0) {
System.out.println("Cannot Find this book.");
}
}
}