Integer - String conversion issue in Java

Question

What is the best way to convert String to Integer.

params.get("contractPriceId"); here I am getting Exception cannot cast Integer to String...

public List<ContractPriceDetailVO> getContractPriceDetails(
        Map<String, String> params) throws DAOException {
    // Get the request object
    HttpServletRequest request = FlexContext.getHttpRequest();
    // Get the AppContext object
    AppContext ac = SessionUtils.getAppContext(request);
    SimpleDateFormat sdf = new SimpleDateFormat(ac.getDateFormat());
    List<Object[]> resultList = new ArrayList<Object[]>();
    if (params.get("specId") != null && params.get("specId").trim() != ""
            && params.get("effDate") != null
            && params.get("effDate").trim() != null)
        resultList = contractPriceEJBService.getContractPriceDetails(ac,
                params);

    String contractPriceId = null;
    if (params.get("contractPriceId") != null){
        try{
        contractPriceId = params.get("contractPriceId");
        }
        catch (Exception e){
            logger.error("Exception in getting contractPriceId "+e.getMessage());
        }
    }
    else{
        contractPriceId = null;
    }

Answer 1

Which exception are you getting ?

Normally we use,

int price = Integer.parseInt("7");

This returns the int value of string.

Please put the exception and error in the question so we can do more analysis of issue.

Answer 2

像这样改变它，它应该可以工作

contractPriceId = params.get("contractPriceId") +"";

Answer 3

From Integer to String, String.valueOf(47).

From String to Integer, Integer.parseInt("47").

To avoid the exception, try String.valueOf(params.get("contractPriceId")).