小编Har*_*rdy的帖子

您好我在这里新的,在Java中新的编程以及实际上我的问题是,我有类图书的数组列表中,我存储图书姓名和头衔,并通过真或假明确设置OnLoan价值,但我能够存储对于书的ArrayList真或假的价值,但我想数清我的ArrayList真正价值数说,如果已经借了3本书状态真的,我想为3我不知道怎么去,在Java中的ArrayList中算出来请大家帮我计这里是我的示例代码我通过从book类调用getOnLoanStatus()得到真正的值,该类包含true和false值

int borrowCount=0;
     Book loanStatus = new Book();
     boolean l = loanStatus.getOnLoanStatus();
     //boolean to String conversion

     System.out.println("value of l is" + l);
     if(this.booksHeld.isEmpty()) 
      {
        return null;
      }
       for(int i=0;i<this.booksHeld.size();i++)
       {
         if(booksHeld.contains(l)) // compare the isbn string with getIsbn Method
         {
             borrowCount++;
         }
       }
        if(borrowCount==0) 
        {
            return "Libray: " + numberOfBooks() + "books " +  " 0 book on Loan";
        }
        else
        {
          return "Libray: " + numberOfBooks() + "books " + borrowCount + "on Loan";
        }