java - 尝试调用方法时出错

Question

我正在尝试创建一个方法。根据我所阅读和观看的内容，虽然这是创建然后调用方法的方法，但我不太确定我是否做得正确。当我遵守时，我收到了错误，所以如果您对如何改进代码有任何建议，我们将不胜感激。

这是错误:

Error: can not find symbol.

它给了我大约 10 个错误，全部与 public static void getLabelData() 中的数组有关，我在其中尝试创建一个方法。

这是代码:

import javax.swing.JOptionPane;
public class MailOrderCall
{
public static void main(String[] args)
{
    streetAddress, city, state, zip.
    String nameAddressArray[] = new String[7];
    String numBoxesInput;
    int numBoxes;
    String enterAnother = "Y";
    int counter;



    getLabelData();

    while(enterAnother.equalsIgnoreCase("Y"))
    {
        counter = 1;
        // begin the inner loop to display a label and increment the counter
        while(counter <= numBoxes)
        {
            System.out.println(nameAddressArray[0] + " " + nameAddressArray[1] + " " + nameAddressArray[2]);
            System.out.println(nameAddressArray[3]);
            System.out.println(nameAddressArray[4] + ", " + nameAddressArray[5] + " " + nameAddressArray[6]);
            System.out.println("Box " + counter + " of " + numBoxes);
            System.out.println();
            counter = counter + 1;
        } // end while

        // ask the user if finished entering mail orders
        enterAnother = " ";   // initialize the variable to something other than "Y" before sending the prompt
        enterAnother = JOptionPane.showInputDialog("Do you want to produce more labels? Y or N");

        // validate input for enterAnother... keep them here until they enter Y, y, N, or n
        while (!enterAnother.equalsIgnoreCase("Y") && !enterAnother.equalsIgnoreCase("N"))
        {
            enterAnother = JOptionPane.showInputDialog(null, "Invalid Response. Please enter Y or N.",
                                                        "DATA ENTRY ERROR", JOptionPane.ERROR_MESSAGE);
        } // end while

        if(enterAnother.equalsIgnoreCase("Y"))
        {
            // if the user said they have more, then send prompts to read the next mail order input from user
        getLabelData();
        } // end if
    } // end while
// successfully terminate the application
system.exit(0);
} // end main()

 public static void getLabelData() {
            nameAddressArray[0] = JOptionPane.showInputDialog("Enter     title (Mr., Ms., Dr., etc.): ");
                nameAddressArray[1] = JOptionPane.showInputDialog("Enter first name: ");
                nameAddressArray[2] = JOptionPane.showInputDialog("Enter lastname: ");
                nameAddressArray[3] = JOptionPane.showInputDialog("Enter street address: ");
                nameAddressArray[4] = JOptionPane.showInputDialog("Enter city: ");
                nameAddressArray[5] = JOptionPane.showInputDialog("Enter state (IL, MO, etc.): ");
                nameAddressArray[6] = JOptionPane.showInputDialog("Enter zip (e.g., 62025): ");

                numBoxesInput = JOptionPane.showInputDialog("Enter number of boxes in the order:");
        numBoxes = Integer.parseInt(numBoxesInput);
}


} // end class

我对此还很陌生，所以如果我的代码完全是一场灾难，我很抱歉，我只是想弄清楚为什么它会给我一个错误。

Answer 1

您似乎正在尝试访问 getLabelData 函数中不可用的变量。如果你想在多个函数中使用一个变量，你应该在整个类的范围内声明它，如下所示:

public class MailOrderCallEMH {

    String nameAddressArray[] = new String[7];
    String numBoxesInput;

    public static void main(String[] args) {
        // ...
    }

}

此外，streetAddress, city, state, zip. 看起来不像有效的 java 语法。您可能应该正常声明这些变量:

// Replace Object by the type you want
Object streetAddress;
Object city;
Object state;
Object zip;

希望这有帮助!