Question

我试图询问用户是否愿意在循环结束时选择Y或N继续。如果他们选择Y，它应该重新启动整个程序，如果N则应该结束。我尝试做的时候一直都会出错。

import javax.swing.JOptionPane;
public class killmenow2
{
  static int killmenow2;

  public static void main (String args[])
  {
String stringFirstNum, stringNextNum, choice;
final String restart = 0;
double firstNum, numNums = 0, total, accumTotal = 0, average, nextNum;

do
{ 
//user enters first number
    stringFirstNum = JOptionPane.showInputDialog("Enter the first number: ");
    firstNum = Double.parseDouble(stringFirstNum);    //convert string to int

``//Initialize accumulator variable to 0
        for(numNums = 0; numNums>0; numNums++)
           accumTotal = 0;

    {
//user enters next number, begins loop which terminates when user enters "0"
   nextNum = 1;
   numNums = numNums++;
      while (nextNum != 0)
      {
      stringNextNum = JOptionPane.showInputDialog("Enter the next number: ");
      nextNum = Double.parseDouble(stringNextNum);  //convert string to int
      accumTotal += nextNum;
            numNums++;
      }
    }
//Accumulate total of next numbers
      total = accumTotal + firstNum;
      System.out.println("The total of your numbers is: " + total);
//calculate average of numbers   
        average = total / numNums;   
        System.out.println("The average of your numbers is: " + average);
        System.out.println("numnums is " + numNums); 
//user inputs if they would like to continue processing numbers
        System.out.println("Would you like to continue processing numbers? (Y/N)");
        if (choice.equals("Y"))
          restart = 0;
        else restart = 1;
    } //do loop close bracket
  while (restart < 0);

          System.out.println("Goodbye");
        System.exit (0);

    }        
    }

Answer 1

final String restart = 0;

这是非法代码

这是

while (restart < 0);

String与int

不同

尝试使用像eclipse这样的IDE并阅读错误

Answer 2

final String restart = 0;

删除final关键字。然后将声明更改为

boolean restart = true;

然后改变逻辑条件

do {
    ...
    System.out.println("Would you like to continue processing numbers? (Y/N)");

***** ADD CODE HERE TO READ THE RESPONSE *****  

    if (choice.equals("Y"))
      restart = true;
    else 
      restart = false;
} while (restart);

更好：

do {
    ...
    System.out.println("Would you like to continue processing numbers? (Y/N)");

***** ADD CODE HERE TO READ THE RESPONSE *****  

} while (choice.equalsIgnoreCase("Y"));

带有Y / N的嵌套循环以继续输入

2 个答案: