src/jCLI/utils/CLI.java
private boolean isPostiveIntegerString (String input) {
            for( int i = 0, n = input.length(); i<n; i++ ) {
                if(! Character.isDigit(input.charAt(i))) {
                    return false;
                }
            }
            return true;
        }
// check if is positive number within String
check if is positive number within String
check if is positive number within String
private boolean isPostiveIntegerString (String input) {
            for( int i = 0, n = input.length(); i<n; i++ ) {
                if(! Character.isDigit(input.charAt(i))) {
                    return false;
                }
            }
            return true;
        }
private boolean isPostiveIntegerString ( String input ) { for ( int i = 0 , n = input . length ( ) ; i < n ; i ++ ) { if ( ! Character . isDigit ( input . charAt ( i ) ) ) { return false ; } } return true ; }
check if is positive number within String
check if is positive number within String