请问下以下语句的区别．．

请教下以下语句的区别．．
请教下以下语句的区别．．

String   a   =   "Java ";
String   b   =   new   String( "Java ");

------解决方案--------------------
String reference variable a (in stack) -----> String "Java " in String Constant Pool
String reference variable b (in stack) -----> String Instance "Java " in Heap