Manager.java:文件
public class Manager {
//定义一个集合来存储图书信息
private ArrayList<Book> list = new ArrayList<>();
/**
* 添加图书
* @param book
*/
public void add(Book book){
list.add(book);
}
/**
* 修改--根据书名修改价格
* @param name
* @param price
*/
public void update(String name,double price){
for (int i = 0; i < list.size(); i++) {
Book book = list.get(i);
if (name.equals(book.getName())){
book.setPrice(price);
System.out.println("修改成功："+book);
}
}
}
/**
* 根据id删除图书
* @param id
*/
public void delete(int id){
for (int i = 0; i < list.size(); i++) {
Book book = list.get(i);
if (id==book.getId()){
list.remove(book);
System.out.println("删除成功");
}
}
}
/**
* 查询--根据id查询图书信息
* @param id
*/
public Book query(int id){
for (int i = 0; i < list.size(); i++) {
Book book = list.get(i);
if (id==book.getId()){
System.out.println(book);
return book;
}
}
return null;
}