Create formatted string from ArrayList

Question

Consider following code:

    ArrayList aList = new ArrayList();
    aList.add(2134);
    aList.add(3423);
    aList.add(4234);
         


        

Answer 1

You could use Commons Lang:

String tmpString = "(" + StringUtils.join(aList, ",") + ")";

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();