sumexception.java

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class NumberRangeException extends Exception
{
  public NumberRangeException()
  {
    super();
  }
  public NumberRangeException(String msg)
  {
    super(msg);
  }
}
public class SumException
{
  public static String sum(String str1, String str2) throws NumberRangeException
  {
    int int1 = Integer.parseInt(str1);
    int int2 = Integer.parseInt(str2);
    if( (int1 < 0) || (int1 > 100) || (int2 < 0) || (int2 > 100) )
    {
      throw(new NumberRangeException("输入的数字超出范围！") );
    }
    return Integer.toString(int1 + int2);
  }
  public static void main(String[] args) 
  {
    try 
    {
      String sum = sum(args[0],args[1]);
      System.out.println("两数相加结果：" + sum);
    }
    catch(NumberRangeException e)
    {
      System.out.println("错误：" + e.getMessage());
    } 
    catch (Exception e)
    {
       e.printStackTrace();
    }
  }
}