import javax.swing.JTextField;

public class DoubleField extends JTextField
{
    public DoubleField()
    {
        super(10);
    }

    public double getDouble()
    {
        double x = 0.0;
        try
        {
            x = Double.parseDouble(getText());
            setText(String.valueOf(x));
        }
        catch(NumberFormatException nfe)
        {
            setText("ERROR: " + nfe.getMessage());
        }
        finally
        {
            return x;
        }
    }
    
    public void setDouble(double x)
    {
        setText(String.valueOf(x));
    }
}