Java if condition code optimise

Kindly help me if there is any other easy way to optimise/implement the code on the below possibilities. Variables like home, bill, reg can either be empty string("") or null depending on the scenario.

My code

public void helloWorld()
{
    List items=new ArrayList();
    items.add("1"); // dummy list
    String home=""; // can be null or empty
    String bill=null;  // can be null or empty
    String reg="";  // can be null or empty
    if(!items.isEmpty())
    {
        System.out.println("List is not null");
        if(home==null&&bill==null&&reg==null) 
        {
            System.out.println("home is null");
            System.out.println("bill is null");
            System.out.println("reg is null");
        }
        if(home==null&&bill==null&&reg!=null)
        {
            System.out.println("home is null");
            System.out.println("bill is null");
            System.out.println("reg is not null");
        }
        if(home==null&&bill!=null&&reg==null)
        {
            System.out.println("home is null");
            System.out.println("bill is not null");
            System.out.println("reg is null");
        }
        if(home==null&&bill!=null&&reg!=null)
        {
            System.out.println("home is null");
            System.out.println("bill is not null");
            System.out.println("reg is not null");
        }
        if(home!=null&&bill==null&&reg==null)
        {
            System.out.println("home is not null");
            System.out.println("bill is null");
            System.out.println("reg is null");
        }
        if(home!=null&&bill==null&&reg!=null)
        {
            System.out.println("home is not null");
            System.out.println("bill is null");
            System.out.println("reg is not null");
        }
        if(home!=null&&bill!=null&&reg==null)
        {
            System.out.println("home is not null");
            System.out.println("bill is not null");
            System.out.println("reg is null");
        }
        if(home!=null&&bill!=null&&reg!=null)
        {
            System.out.println("home is not null");
            System.out.println("bill is not null");
            System.out.println("reg is not null");
        }
    }
    else
    {
        System.out.println("List is null");
    }
}

Please advise. Thanks in advance.