Question

我正在尝试编写一个菜单来处理我的类以进行分配。我有我想尝试的课程但是我似乎在创建菜单时遇到了问题。

 switch(choice)
 {
    case 1:
        System.out.print("Please enter a filename: ");
        filename = option.next();

         //creating objects of the file manager to open the required files
        FileManager e = new FileManager("Z:\\Java\\College\\Robo-Reader\\src\\"+filename+".txt");
        FileManager e1 = new FileManager("Z:\\Java\\College\\Robo-Reader\\src\\punctuation.txt");

        //creating connection to the files
        e.connectToFile();
        e1.connectToFile();

        //Reading the files
        String[] fileToBeRead= e.readFile();
        String[] punctMarks = e1.readFile();

        //closing the files
        e.closeReadFile();
        e1.closeReadFile();
        fileRead++;
        break;

    case 2:

        if(fileRead == 0)
        {
            System.out.println("No file was read. Please open a file to correct this error:");

        }
        else
        {
            FindLan t3 = new FindLan(fileToBeRead);
            t3.cLang();
        }
        break;

    case 3:
        if(fileRead == 0)
        {
            System.out.println("No file was read. Please open a file to correct this error:");

        }
        else
        {

            //Creating the object for the remove punctuation class
            RemovePunct t1 = new RemovePunct(punctMarks, fileToBeRead);

            //Calling the EndArray(Remove) method to clean an array of punctuation marks
            String[] cleanWords = t1.EndArray();

             for(int i=0; i<10; i++)
             {
                System.out.println(cleanWords[i]);
             }
        }
    default:
        System.out.println("Option is not available");
 }

所以我需要能够在案例2和3中使用案例1中的变量，但我需要在案例1中初始化它们以获得数组的长度。

到目前为止，我尝试使用try / catch块，但似乎无法解决问题。关于如何在其他情况下使用案例一的初始化值而不必在案例2/3中给出值的任何其他想法？

主要目标是能够使用在案例1中定义的数组，从filemanager类获取它们的大小和元素，并在其他2个案例中使用它们而不必定义大小或元素。

Answer 1

将变量声明移到switch语句之外，如下所示：

FileManager e = null;
FileManager e1 = null;
String[] fileToBeRead;
String[] punctMarks;

switch(choice)
{
    case 1:
        System.out.print("Please enter a filename: ");
        filename = option.next();

         //creating objects of the file manager to open the required files
        e = new FileManager("Z:\\Java\\College\\Robo-Reader\\src\\"+filename+".txt");
        e1 = new FileManager("Z:\\Java\\College\\Robo-Reader\\src\\punctuation.txt");

        //creating connection to the files
        e.connectToFile();
        e1.connectToFile();

        //Reading the files
        fileToBeRead= e.readFile();
        punctMarks = e1.readFile();

        //closing the files
        e.closeReadFile();
        e1.closeReadFile();
        fileRead++;
        break;

    case 2:

        if(fileRead == 0)
        {
            System.out.println("No file was read. Please open a file to correct this error:");

        }
        else
        {
            FindLan t3 = new FindLan(fileToBeRead);
            t3.cLang();
        }
        break;

    case 3:
        if(fileRead == 0)
        {
            System.out.println("No file was read. Please open a file to correct this error:");

        }
        else
        {

            //Creating the object for the remove punctuation class
            RemovePunct t1 = new RemovePunct(punctMarks, fileToBeRead);

            //Calling the EndArray(Remove) method to clean an array of punctuation marks
            String[] cleanWords = t1.EndArray();

             for(int i=0; i<10; i++)
             {
                System.out.println(cleanWords[i]);
             }
        }
    default:
        System.out.println("Option is not available");
 }

变量未初始化

1 个答案: