tokennumeric.java

Java程序设计技巧与开发实例附书源代码。

public class TokenNumeric
    extends Token
{
  private double number = 0.0;

  public TokenNumeric(double _number)
  {
    number = _number;
  }

  public TokenNumeric(String _number) throws TokenException
  {
    try
    {
      number = Double.valueOf(_number).doubleValue();
    }
    catch (NumberFormatException ne)
    {
      throw new TokenException("Invalid numeric format: " + _number);
    }
  }

  public double getNumber()
  {
    return number;
  }

  public String toString()
  {
    return String.valueOf(number);
  }
}