从ArrayList创建格式化的字符串 [英] Create formatted string from ArrayList

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

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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