if statement - Java if condition code optimise -

kindly me if there other easy way optimise/implement code on below possibilities. variables home, bill, reg can either empty string("") or null depending on scenario.

my code

public void helloworld() {     list items=new arraylist();     items.add("1"); // dummy list     string home=""; // can null or empty     string bill=null;  // can null or empty     string reg="";  // can null or empty     if(!items.isempty())     {         system.out.println("list not null");         if(home==null&&bill==null&&reg==null)          {             system.out.println("home null");             system.out.println("bill null");             system.out.println("reg null");         }         if(home==null&&bill==null&&reg!=null)         {             system.out.println("home null");             system.out.println("bill null");             system.out.println("reg not null");         }         if(home==null&&bill!=null&&reg==null)         {             system.out.println("home null");             system.out.println("bill not null");             system.out.println("reg null");         }         if(home==null&&bill!=null&&reg!=null)         {             system.out.println("home null");             system.out.println("bill not null");             system.out.println("reg not null");         }         if(home!=null&&bill==null&&reg==null)         {             system.out.println("home not null");             system.out.println("bill null");             system.out.println("reg null");         }         if(home!=null&&bill==null&&reg!=null)         {             system.out.println("home not null");             system.out.println("bill null");             system.out.println("reg not null");         }         if(home!=null&&bill!=null&&reg==null)         {             system.out.println("home not null");             system.out.println("bill not null");             system.out.println("reg null");         }         if(home!=null&&bill!=null&&reg!=null)         {             system.out.println("home not null");             system.out.println("bill not null");             system.out.println("reg not null");         }     }     else     {         system.out.println("list null");     } } 

please advise. in advance.

just check home, bill, , reg individually, because have no dependency each other.

public void helloworld() {     list items=new arraylist();     items.add("1"); // dummy list     string home=""; // can null or empty     string bill=null;  // can null or empty     string reg="";  // can null or empty     if(!items.isempty())     {         system.out.println("list not null");         system.out.println( home == null ? "home null" : "home not null" );         system.out.println( bill == null ? "bill null" : "bill not null" );         system.out.println( reg == null ? "reg null" : "reg not null" );      }     else     {         system.out.println("list null");     } }