java - 循环未按预期工作

Question

我必须创建一个为包创建标签的 java 代码。当用户输入“y”或“Y”来响应“您想创建更多”时，它将再次进行循环。如果用户输入“y”或“Y”以外的任何内容，它将退出循环。我遇到的问题是，在用户输入所有信息并被问到问题后，如果用户说出 y 或 Y 以外的任何内容，它会退出程序，但不会输出任何标签信息。如果我输入 y 或 Y，它会正确输出标签信息并再次完美地运行循环。只是想知道是否有人可以帮助我看看我做错了什么，以便我可以在输入 y 或 Y 以外的任何内容后让它输出标签信息。

import javax.swing.JOptionPane;

public class MailOrderAFG //Define my public class
{
    public static void main(String [] args)
    {
    String title, firstName, lastName, streetAddress, city, state, zip, numBoxesInput, enterAnother;
    String a = "y", b = "Y";
    title = JOptionPane.showInputDialog("Enter title (Mr., Mrs., Ms., etc.): ");
    firstName = JOptionPane.showInputDialog("Enter first name: ");
    lastName = JOptionPane.showInputDialog("Enter last name: ");
    streetAddress = JOptionPane.showInputDialog("Enter street address: ");
    city = JOptionPane.showInputDialog("Enter city: ");
    state = JOptionPane.showInputDialog("Enter state: ");
    zip = JOptionPane.showInputDialog("Enter zip code: ");
    numBoxesInput = JOptionPane.showInputDialog("Enter number of boxes in the order: ");
    enterAnother = JOptionPane.showInputDialog ("Do you want to produce more labels? Y or N ");
    int numBoxes = 0;
    int i;


    while(enterAnother.equals(a) || enterAnother.equals(b)) //priming read

    {



        numBoxes = Integer.parseInt(numBoxesInput); //changing string to int so we can do arithmatic with it
        {


            for (i = 1; i <= numBoxes; i++) { //adding one until i is equal to numBoxes, then it will exit the loop
            System.out.println(title + " " + firstName + " " + lastName);
            System.out.println(streetAddress);
            System.out.println(city + ", " + state + " " + zip);
            System.out.println("Box " + i + " of " + numBoxes);
            System.out.println();}



            title = JOptionPane.showInputDialog("Enter title (Mr., Mrs., Ms., etc.): ");
            firstName = JOptionPane.showInputDialog("Enter first name: ");
            lastName = JOptionPane.showInputDialog("Enter last name: ");
            streetAddress = JOptionPane.showInputDialog("Enter street address: ");
            city = JOptionPane.showInputDialog("Enter city: ");
            state = JOptionPane.showInputDialog("Enter state: ");
            zip = JOptionPane.showInputDialog("Enter zip code: ");
            numBoxesInput = JOptionPane.showInputDialog("Enter number of boxes in the order: ");
            enterAnother = JOptionPane.showInputDialog ("Do you want to produce more labels? Y or N ");

        }

    }

        System.exit(0);

}
}

Answer 1

我可以看到您通过尝试复制并粘贴原始代码来创建循环，但生成的代码的工作流程不正确。

看，您的代码目前是这样的:

FETCH INFO FROM USER
ASK IF USER WANTS MORE

while (WANTSMORE)
    PRINT INFO

    FETCH INFO FROM USER
    ASK IF USER WANTS MORE
end while

end program

看，实际上应该是这样的:

do
    FETCH INFO FROM USER
    ASK IF USER WANTS MORE
    PRINT INFO
while (WANTSMORE)

end program

看看是否可以重新排序代码以便更正工作流程。检查this link如果您需要有关do-while的信息。