question: private static String escapeJSON ( String text ) { StringBuilder builder = new StringBuilder ( ) ; builder . append ( '"' ) ; for ( int index = 0 ; index < text . length ( ) ; index ++ ) { char chr = text . charAt ( index ) ; switch ( chr ) { case '"' : case '\\' : builder . append ( '\\' ) ; builder . append ( chr ) ; break ; case '\b' : builder . append ( "\\b" ) ; break ; case '\t' : builder . append ( "\\t" ) ; break ; case '\n' : builder . append ( "\\n" ) ; break ; case '\r' : builder . append ( "\\r" ) ; break ; default : if ( chr < ' ' ) { String t = "000" + Integer . toHexString ( chr ) ; builder . append ( "\\u" + t . substring ( t . length ( ) - 4 ) ) ; } else { builder . append ( chr ) ; } break ; } } builder . append ( '"' ) ; return builder . toString ( ) ; }
target:  Escape a string to create a valid JSON string