我在Java中抛出的异常无法正常工作

Question

I'm working on a project where we are to create a cash register system that gives errors for orders of $0.00 and 0 total items. The code for the exceptions is below. I have to use this method.

  public boolean ValidateOrderTotal(double total)  
  {
      boolean validTotalFlag = true;
      try
      {
          if (total < 0)
          Exception invalidTotalEX = new Exception ("Total mst be >= $0.00");
          throw invalidTotalEX;
      }
  catch (Exception invalidTotalEX)(
  validTotalFlag = false;
  SetTotal(0.00);
  System.out.println(invalidTotalEX);
  }

return validTotalFlag;

public boolean ValidateOrderProductTotal (double totalItems)
{
boolean validProdctTotalFlag = true;
try
{
if (totalItems < 0)
(Exception invalidProductTotalEX = new Exception ("Product total must be >=0");
throw invalidProductTotalEX;
}
}
catch (Exception invalidProductTotalEX)(
validProdctTotalFlag = false);
SettotalItems (0);
system.out.println (invalidProductTotalEX);
)
return valid ProductTotalFlag

Answer 1

      if (total < 0)
      Exception invalidTotalEX = new Exception ("Total mst be >= $0.00");
      throw invalidTotalEX;

needs curly braces

      if (total < 0) {
          Exception invalidTotalEX = new Exception ("Total mst be >= $0.00");
          throw invalidTotalEX;
      }

You have a second if with the exact same issue.

Also your catch blocks need to use { and } around the statements. You are using ( and ) in some places.

Answer 2

As it throws error when it is 0 it should be:

if (total <= 0) {
          Exception invalidTotalEX = new Exception ("Total mst be > $0.00");
          throw invalidTotalEX;
      }

Answer 3

"catch (Exception invalidTotalEX)(" - there should be last '{' after "catch (Exception invalidTotalEX)(" instead of '('

Variable name does not matter, for example:

viktor@Viks-pro:~/tmp/test $ cat ExTest.java
import java.util.*;
public class ExTest
{   public static void main(String[] args)
    {   try
        {   throw new Exception("Something should be different");
        }
        catch(Exception e)
        {   System.out.println("Exception: "+e.getMessage());
        }
    }
}viktor@Viks-pro:~/tmp/test $ java ExTest
Exception: Something should be different