java - 我正在尝试查找此代码中可能存在超出范围的变量的位置；它与文字游戏中的元素有关

Question

错误发生在第二个片段中。请给点建议？

用于查看特定项目的代码

private void lookItem(Command command) 
{
    if (!command.hasSecondWord())
    {
        // If there is no second word, we don't know where to look...
        System.out.println("Look where?");
        return;
    }        
    else
    {
        // First check to see if that item is in the room...
        // Need a loop to run through ArrayList and determine yes/no that the item is here
        boolean presentInRoom = false;
        for (int i=0; i<currentRoom.inventory.size(); i++)
        {
            if (currentRoom.inventory.get(i).getName().equalsIgnoreCase(command.getSecondWord()) == true)
            {
                presentInRoom = true;
                break;
            }
        }

        // If the item was present in the room's ArrayList, read or look at it
        if (presentInRoom == true)
        {
            System.out.println ("You look at" );
        }

        // If the item was not present in the room's ArrayList print an error message
        if (presentInRoom == false)
        {
            System.out.println( "isn't here!");
        }
    }
}

获取特定元素的代码

private void takeItem(Command command)
{
    if (!command.hasSecondWord())
    {
        // if there is no second word, we don't know what to take...
        System.out.println("Take what?");
        return;
    }
    else
    {
        // First check to see if that item is in the room...
        // Need a loop to run through ArrayList and determine yes/no that the item is here
        boolean presentInRoom = false;
        for (int i=0; i<currentRoom.inventory.size(); i++)
        {
            if (currentRoom.inventory.get(i).getName().equalsIgnoreCase(command.getSecondWord()) == true)
            {
                presentInRoom = true;
                break;
            }
        }
    }
    // If the item was present in the room's ArrayList, add it to our own belongings (add
    // to our own ArrayList, and delete from the ArrayList for this room
    if (presentInRoom == true)
    {
        belongings.add(i);
        inventory.remove(i);
        System.out.println("You take" );
    }

    // If the item was not present in the room's ArrayList print an error message
    if (presentInRoom == false)
    {
        System.out.println("isn't here!");
    }
}

第二段代码标记出来

cannot find symbol - variable presentInRoom

当我尝试编译时。我还想知道如何在 println 中指定一个 Item。

Answer 1

在方法的开头声明 presentInRoom ，应该没问题(还为最后一个系统添加了 itemFound 字符串):

private void takeItem(Command command)
{
    boolean presentInRoom = false;
    String itemFound = "";
    Integer itemId = null;
    if(!command.hasSecondWord())
    {
        // if there is no second word, we don't know what to take...
        System.out.println("Take what?");
        return;
    }
    else
    {
        // First check to see if that item is in the room...
        // Need a loop to run through ArrayList and determine yes/no that the item is here

        for (int i=0; i<currentRoom.inventory.size(); i++)
        {
            if (currentRoom.inventory.get(i).getName().equalsIgnoreCase(command.getSecondWord()) == true)
            {
                presentInRoom = true;
                itemFound = currentRoom.inventory.get(i).getName();
                itemId = i;
                break;
            }
        }
    }
    // If the item was present in the room's ArrayList, add it to our own belongings (add
    // to our own ArrayList, and delete from the ArrayList for this room
    if (presentInRoom == true)
    {
         belongings.add(itemId);
         inventory.remove(itemId);
         System.out.println("You take "+itemFound);
    }

    // If the item was not present in the room's ArrayList print an error message
    if (presentInRoom == false)
    {
        System.out.println("isn't here!");
    }
}