Java return a value from a method using nested if else statements

I have a method that returns something depending on the if conditions. But when I am using the below code, it doesn't recognize my return statement and says to change the method declaration to void. Can you please help optimizing the code.

        if(myList == null){
            return abc;
        } else {
                for(myList myListItem : myList){            
                    if(myList.getId() != null){
                        if(TEST1.equals(myListItem.getId())){
                            return abc;
                        } else if(TEST2.equals(myListItem.getId())){
                            return xyz;
                        } else if(TEST3.equals(myListItem.getId())){
                            return pqr;
                        }
                    }  
                }
            }