code: public boolean get(boolean defaultValue)
      {
          final String value =
              getInternal(
                  Boolean.toString(defaultValue),
                  false);
          if (value == null) {
              return defaultValue;
          }
          return toBoolean(value);
      }
docs: Retrieves the value of this boolean property.
  
  <p>Returns <code>true</code> if the property exists, and its value is
  <code>1</code>, <code>true</code> or <code>yes</code>; returns <code>
  false</code> otherwise.