Why does (null+"").equals("null") return true in Java?

Question

Possible Duplicate:
Concatenating null strings in Java

Why is obj equals "null"?

public static void main(String[] args) {
 Object obj = null+"";
 System.out.println(obj.equals("null"));
}

java version "1.6.0_23" Java(TM) SE Runtime Environment (build 1.6.0_23-b05)

Answer 1

String.equals() compares the contents of the Strings.

The objects are both strings and contain the same data.

Answer 2

Try this:

System.out.println(obj);

and then print:

System.out.println(obj.equals("null"));

Can you see it ... The content you saved is 'null' and you are matching content 'null'