// MyStringField.java
import quickfix.StringField;
public class MyStringField extends StringField
{
public MyStringField() { super(6123); }
public MyStringField(String data) { super(6123, data); }
}
// MyPriceField.java
import quickfix.DoubleField;
public class MyPriceField extends DoubleField
{
public MyPriceField() { super(8756); }
public MyPriceField(double data) { super(8756, data); }
}