Questions about Java's String pool [duplicate]

Answer 1

The only time you should use new String(foo) is when you want to break ==, which is an odd case, or when foo is a substring of a much larger string that has a limited lifetime, such as

String mystring;
{
   String source = getSomeHeinouslyLargeString();
   mystring = new String(source.substring(1,3));
}