converting from Object to string in java

Question

I have this below method

public List<Object> ProductbyJobcode (String jobcode)
{
    List<Object> temp = new ArrayList<Object>();
    temp = riskJobCodeProductMappingDAO.fetchProductByJobCode(jobcode);
    return temp;
}

and i am taking the input in the Object list from the above method into Object type of list

List<Object> temp = new ArrayList<Object>() ;
temp = ProductbyJobcode(jobcode);

now i am trying to retrieve the value into string but i am getting exception, please advise how to achieve the same how i will convert the object to string

String Product ;
String Actiontype;

for (int i = 0; i < temp.size(); i++) {
    product = temp.get(0).toString();
    Actiontype = temp.get(1).toString();
}

Please look up and use proper Java naming conventions. Variables, fields and methods should be lowerCamelCase. It's confusing to read otherwise. — Michael
– Michael, Commented Jun 15, 2018 at 11:23
1) For better help sooner, post a minimal reproducible example or Short, Self Contained, Correct Example. 2) Always copy/paste error and exception output! — Andrew Thompson
– Andrew Thompson, Commented Jun 15, 2018 at 11:26

Oleg Cherednik · Accepted Answer · 2018-06-15 12:12:47Z

1

Object.toString() could provide NPE. So more suitable method is String.valueOf().

String Product = temp.size() >= 1 ? String.valueOf(temp.get(0)) : null;
String Actiontype = temp.size() >= 2 ? String.valueOf(temp.get(1)) : null;

answered Jun 15, 2018 at 12:12

Oleg Cherednik

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Comments

daniu · Accepted Answer · 2018-06-15 11:33:35Z

Well this

for (int i = 0; i < temp.size(); i++) {
    product = temp.get(0).toString();
    Actiontype = temp.get(1).toString();
}

doesn't really test the bounds of the list correctly; you might only have one String in the list, which will mean temp.get(1) throws an IndexOutOfBoundsException.

It's not clear what exactly you're trying to achive, but this should work:

for (int i = 0; < temp.size; i++) {
    System.out.println(temp.get(0));
}

If you really need the two items, you probably want something like this

product = (temp.isEmpty()) ? null : temp.get(0).toString();
actionType = (temp.size() > 1) ? temp.get(1).toString() : null;

Rafał Sokalski · Accepted Answer · 2018-06-15 11:33:57Z

0

The problem is that if your temp list contains only 1 element you try to get second element in this line:

Actiontype = temp.get(1).toString();

That cause:

java.lang.IndexOutOfBoundsException

Because you try to get second element when the list contains only one

answered Jun 15, 2018 at 11:33

Rafał Sokalski

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