question: private String validateInputs ( ) { if ( jarRadio . getSelection ( ) ) { File f = new File ( jarPath . getText ( ) ) ; if ( ! f . exists ( ) ) { return "Jar file doesn't exists" ; } if ( ! f . canRead ( ) ) { return "Can't read Jar file directory" ; } } else { File f = new File ( dirPath . getText ( ) ) ; if ( ! f . exists ( ) ) { return "Base Path directory doesn't exists" ; } if ( ! f . canRead ( ) ) { return "Can't read Base Path directory" ; } } return null ; }
target:  Determine if the current set of analysis inputs are valid. If not, provide an error message that describes the problem.