使用Arraylist实现动态加载改变string【】

ArrayList list = new ArrayList();
     if(merchant.getPhone().length()!=0||null!=merchant.getPhone()&&merchant.getTel().length()!=0||null!=merchant.getTel()){
      list.add(merchant.getTel());
      list.add(merchant.getPhone());
     }else if(merchant.getPhone().length()!=0||null!=merchant.getPhone()&&merchant.getTel().length()==0||null==merchant.getTel()){
      list.add(merchant.getPhone());
     }else if(merchant.getPhone().length()==0||null==merchant.getPhone()&&merchant.getTel().length()!=0||null!=merchant.getTel()){
      list.add(merchant.getTel());
     }
     final String[] item=(String[])list.toArray(new String[list.size()]);