question: public String clearTextual ( String text ) { if ( text == null || text . isEmpty ( ) ) { return "Usage: /clearSetting <setting>" ; } String [ ] split = text . split ( " " ) ; String setting = split [ 0 ] ; if ( isBooleanSetting ( setting ) ) { return "Boolean settings can't be cleared." ; } if ( isLongSetting ( setting ) ) { return "Numeric settings can't be cleared." ; } if ( isStringSetting ( setting ) ) { setString ( setting , "" ) ; return "Setting '" + setting + "' set to empty string." ; } return settingInvalidMessage ( setting ) ; }
target:  Sets the setting with the specified name to an empty value. This is only possible with Strings.