field initializtion

["Stone, Brad V (TC)" <bvstone@xxxxxxxxxxxxxx>]

What is more correct and why when creating local work fields in a method?

String newString = new String();
or
String newString = null;
or
String newString = "";

How about when you're creating a class?  I've read that a class that returns
a null attribute is a pain in the arse.  So, would you simple use the
constructor to change the value from null to ""?  for example

Class MyClass {
  String value = null;

  public MyClass() {
    value="";
  }
}

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