Java-使列表大小动态

Question

I need to make the size of a list fixed dynamic but dynamic based on the parameters of its initiation.

I am trying the following -

int countOptions = countOptions(s_sqlContext, s_organisationId);
String responseListSize = "\"0\"";
String addResponseTuple = ",\"0\"";

for (int i = 1; i < countOptions; i++) {
    responseListSize = responseListSize.concat(addResponseTuple);
}

List<String> ret = Arrays.asList(new String[] { responseListSize });

countOptions returns an integer that may be 10 for one person or 3 for another. This obviously does not work because it is setting ret as a single index List of "0","0","0","0" (if countOptions is 4), when I need each "0" to have its own index.

I hope this all makes sense, and I really hope it is possible.

Answer 1

Try to use ArrayList instead of String concatenation.

List<String> responseListSize = new ArrayList<String>(countOptions);

for(int i = 0; i < countOptions; i++){
    responseListSize.add( addResponseTuple );
}