question: private static void appendJSONPair ( StringBuilder json , String key , String value ) throws UnsupportedEncodingException { boolean isValueNumeric = false ; try { if ( value . equals ( "0" ) || ! value . endsWith ( "0" ) ) { Double . parseDouble ( value ) ; isValueNumeric = true ; } } catch ( NumberFormatException e ) { isValueNumeric = false ; } if ( json . charAt ( json . length ( ) - 1 ) != '{' ) { json . append ( ',' ) ; } json . append ( escapeJSON ( key ) ) ; json . append ( ':' ) ; if ( isValueNumeric ) { json . append ( value ) ; } else { json . append ( escapeJSON ( value ) ) ; } }
target:  Appends a json encoded key/value pair to the given string builder.