一些代码记录

1、调整list的位置

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// list调整数据位置：d换到第一位，c换到第二位。         List<String> listCapacity = new ArrayList<>();         listCapacity.add("a");         listCapacity.add("b");         listCapacity.add("c");         listCapacity.add("d");         for (String s : listCapacity){             if (s.equals("d")){                 if (! listCapacity.get(0).equals(s)){                     String temp = listCapacity.get(0);                     int index = listCapacity.indexOf(s);                     listCapacity.set(0,s);                     listCapacity.set(index,temp);                 }             }else if (s.equals("c")){                 if (! listCapacity.get(1).equals(s)){                     String temp = listCapacity.get(1);                     int index = listCapacity.indexOf(s);                     listCapacity.set(1,s);                     listCapacity.set(index,temp);                 }             }         }