java - What is the difference between "text" and new String("text")?

itemprop="text">

What is the difference
between these two following
statements?

String s =
            "text";

String s = new
            String("text");

class="post-text" itemprop="text">

class="normal">Answer

new
String("text");
explicitly creates a new and referentially
distinct instance of a String object; String s =
"text"; may reuse an instance from the string constant
pool if one is
available.

You very
rarely would ever want to use the new
String(anotherString) constructor. From the
API:

href="http://java.sun.com/javase/6/docs/api/java/lang/String.html#String%28java.lang.String%29"
rel="noreferrer">String(String original) :
Initializes a newly created String object
so that it represents the same sequence of characters as the argument; in other words,
the newly created string is a copy of the argument string. Unless an explicit copy of
original is needed, use of this constructor is unnecessary since strings are immutable.

Related
questions

/>

What referential distinction
means

Examine the following
snippet:

 String s1 =
            "foobar";
 String s2 = "foobar";

 System.out.println(s1
            == s2); // true


 s2 = new String("foobar");

            System.out.println(s1 == s2); // false
 System.out.println(s1.equals(s2)); //
            true

==
on two reference types is a reference identity comparison. Two objects that are
equals are not necessarily ==. It is
usually wrong to use == on reference types; most of the time
equals need to be used
instead.

Nonetheless, if for whatever reason you
need to create two equals but not ==
string, you can use the new
String(anotherString) constructor. It needs to be said again, however, that
this is very peculiar, and is rarely the
intention.

References

Related
issues