Question

所以我使用JOptionPane创建程序并使用do while。我只有1个错误

令牌上的语法错误＆＃34;）＆＃34;，;在此令牌之后预期在＆＃34; while（select＆gt; 5）
上表达

这是我的代码

public class Labwork2ABUEL {

public static void main(String[] args)
{
    float num;
    String choice, input, numInput;
    int select, area, width, height, n, i, f;

    double radius, area1;


    Object[] options = {"Yes", "No"};

    do {
        choice = JOptionPane.showInputDialog("Main Menu " +
    "\n 1. COMPUTE FOR AN AREA OF CIRCLE"
    + "\n 2. COMPUTE FOR AN AREA OF SQUARE"
    + " \n 3. COMPUTE FOR AN AREA OF RECTANGLE"
    + "\n 4. COMPUTE FOR A FACTORIAL OF A NUMBER"
    + "\n 5. EXIT THE PROGRAM");
    }

    while (select > 5)
    {   
        choice = JOptionPane.showInputDialog("Enter only 1-5!" +
    "\n Main Menu +"
    + "\n 1. COMPUTE FOR AN AREA OF CIRCLE"
    + "\n 2. COMPUTE FOR AN AREA OF SQUARE"
    + "\n 3. COMPUTE FOR AN AREA OF RECTANGLE"
    + "\n 4. COMPUTE FOR A FACTORIAL OF A NUMBER"
    + "\n 5. EXIT THE PROGRAM");
    }

    if (select == 1)
    {
        choice = JOptionPane.showInputDialog("Enter Radius", "Circle Area Input");
        radius = Double.parseDouble(input);
        area1 = Math.PI * Math.pow(radius, 2);
        String message = "Area of Circle: " + area1;
        String title = "Circle Area Output";
        JOptionPane.showMessageDialog(null, message, title, select);

Answer 1

在while (some condition);循环结束}后，您遗失了do。

或者，您在;之后错过while (select > 5)。

但在此之后，您将获得与未初始化变量相关的大量错误，例如select。还有一大堆逻辑错误，比如select循环中没有更改while (select > 5)。

Answer 2

do {
        choice = JOptionPane.showInputDialog("Main Menu " +
    "\n 1. COMPUTE FOR AN AREA OF CIRCLE"
    + "\n 2. COMPUTE FOR AN AREA OF SQUARE"
    + " \n 3. COMPUTE FOR AN AREA OF RECTANGLE"
    + "\n 4. COMPUTE FOR A FACTORIAL OF A NUMBER"
    + "\n 5. EXIT THE PROGRAM");
    }while(some condition);//missing it.

令牌上的语法错误＆＃34;）＆＃34;，;在表达此标记之后预期

2 个答案: