变化的ArrayList <?>标签每个列表元素

Question

我有以下方法：

public String[][] launch(){ 

     String[][] result = new String[2][]; 

     for (int i = 0; i<2; i++){ 

      device.pressHome(); 
      ui.wait(500); 
      ui.close(); 
      ui.close(); 
      ui.openProgram("ON"); 

      long TStart = System.currentTimeMillis(); 
      ui.detectContactList(); 
      long TStop = System.currentTimeMillis(); 
      float res = TStop - TStart; 
      res /= 1000; 
      ui.log("[loading time]: "+ res); 

      ArrayList<String> attemptList = new ArrayList<String>(); 
      attemptList.add("Loading time"); 
      attemptList.add(Integer.toString(i)); 
      attemptList.add(Float.toString(res)); 
      result[i] = attemptList.toArray(new String[attemptList.size()]); 
      System.out.println(attemptList); 

     } 
     return result; 
    } 

ArrayList中，我有标签 - 字符串，我想改变它的东西其他每个列表元素，我加入它。我怎样才能做到这一点？