java - New String vs String s = "something" , what's the difference ?

Consider the code :

public class Strings {


    public static void createStr()
    {
        String s1 = new String("one");
        String s2 = "one";

        System.out.println(s1);
        System.out.println(s2);
    }


    public static void main(String args[])
    {
        createStr();
    }

}

What's the difference between String s1 = new String("one"); and String s2 = "one"; ?