Assigning to a variable if string is null

Question

I have a code that sets the instance variables name, although if the user enters null the name should appear as "Unknown" I am unable to think of how to do this, please check out my code and help me with how I am going about it wrong. Thanks!

My code:

  if (name.equals(null))
    {
        this.name = name;
        name="Unknown";
    }
    else
    {
        this.name=name;
    }

Answer 1

If user enters null it has to be checked with "null" String, like below. Have added few more checks.

if (name == null || "".equals(name.trim()) || "null".equals(name)) {
        this.name = name;
        this.name="Unknown";
} else {
        this.name=name;
}

Answer 2

if (name.equals("null"))
{
   name = "Unknown";
}