code: public String get(String name, String defaultValue) {
          return substituteVars(getProps().getProperty(name, defaultValue));
      }
docs: Get the value of the <code>name</code> property. If no such property
  exists, then <code>defaultValue</code> is returned.
  
  @param name property name.
  @param defaultValue default value.
  @return property value, or <code>defaultValue</code> if the property
  doesn't exist.