Frage im Vorstellungsgespräch bei Apple

In JAVA, what is the difference between 'String a = new String()' and String a = String()'? What does the new keyword indicate?

Frage im Vorstellungsgespräch bei Apple: In JAVA, what is the difference between 'String a = new String()' and String a = String()'? What does the new keyword indicate? | Glassdoor