Error in checking null value in string

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Error in checking null value in string

Error in checking null value in string

Hi am getting Exception : java.lang.NullPointerException in the following code:

String registerno=null;
registerno=request.getParameter("registerno");
int r=0;
if(!registerno.equals(null)) /* Error line */
{   
    r=1;
}

Can anyone plz help me to solve this. Thanks in advance.

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