java - 搜索ArrayList对象: object's

Question

我努力寻找解决方案，或者至少为我指明正确的方向......

这是我的 ArrayList: books = new ArrayList();

我必须搜索包含标题(字符串)的 Book 对象。这是我所拥有的..

问题是我只想在找不到第二条语句时打印它。但它似乎在搜索列表中的每个对象时打印它？

public void searchBookInCollection(String title) 
{
    for (Book book : books)
    {
        if(book.getTitle().equalsIgnoreCase(title)) 
        {
            book.displayBookInformation();
        }
        else
        {
            System.out.println("Nope we don't have it");
        }
    }
 }

Answer 1

将其更改为 boolean 值已找到标志

public void searchBookInCollection(String title) 
{
      boolean found = false;
      for (Book book : books)
      {
            if(book.getTitle().equalsIgnoreCase(title)) 
            {
               book.displayBookInformation();
               found = true;
               break;  // no point to keep going? 
            }
       }
       if (!found)
       {
           System.out.println("Nope we don't have it");
       }
}