本文介绍了从ArrayList创建格式化的字符串的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
考虑以下代码:
ArrayList<Integer> aList = new ArrayList<Integer>();
aList.add(2134);
aList.add(3423);
aList.add(4234);
aList.add(343);
String tmpString = "(";
for(int aValue : aList) {
tmpString += aValue + ",";
}
tmpString = (String) tmpString.subSequence(0, tmpString.length()-1) + ")";
System.out.println(tmpString);
我的结果是预期的(2134,3423,4234,343).
My result here is (2134,3423,4234,343) as expected..
我确实将最后一个逗号替换为)以得到预期的结果.通常有更好的方法吗?
I do replace the last comma with the ending ) to get expected result. Is there a better way of doing this in general?
推荐答案
您可以使用:
String tmpString = "(" + StringUtils.join(aList, ",") + ")";
或者,如果您不能使用外部库:
Alternatively, if you can't use external libraries:
StringBuilder builder = new StringBuilder("(");
for (int aValue : aList) builder.append(aValue).append(",");
if (aList.size() > 0) builder.deleteCharAt(builder.length() - 1);
builder.append(")");
String tmpString = builder.toString();
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