How to Iterate through List of Object arrays

Question

So right now I have a program containing a piece of code that looks like this...

Criteria crit = session.createCriteria(Product.class);
ProjectionList projList = Projections.projectionList();
projList.add(Projections.max("price"));
projList.add(Projections.min("price"));
projList.add(Projections.countDistinct("description"));
crit.setProjection(projList);
List results = crit.list();

I want to iterate results.So thank you in advance for any help/advice that is offered.

If this is schoolwork tag it as such. Otherwise, List<Product> results = crit.list(); and then for (Product p: results) {} — Erik
– Erik, Commented Dec 22, 2011 at 7:47

Comrade · Accepted Answer · 2011-12-22 09:39:15Z

22

In this case you will have a list whose elements is an array of the following: [maxPrice,minPrice,count].

....
List<Object[]> results = crit.list();

for (Object[] result : results) {
    Integer maxPrice = (Integer)result[0];
    Integer minPrice = (Integer)result[1];
    Long count = (Long)result[2];
}

answered Dec 22, 2011 at 9:39

Comrade

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Comments

Ted Hopp · Accepted Answer · 2011-12-22 07:47:53Z

5

You can probably do something like this:

for (Object result : results) {
    // process each result
}

answered Dec 22, 2011 at 7:47

Ted Hopp

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Comments

Jigar Joshi · Accepted Answer · 2014-03-30 01:21:56Z

5

You could use Generic in List and for each but for current code you could do following to iterate

for(int i = 0 ; i < results.size() ; i++){
 Foo foo = (Foo) results.get(i);

}

Or better to go for readable for-each loop

for(Foo foo: listOfFoos){
  // access foo here
}

edited Mar 30, 2014 at 1:21

answered Dec 22, 2011 at 7:44

Jigar Joshi

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3 Comments

Erik Over a year ago

Or maybe use an iterator if you want to be slightly more modern? like for (Iterator<Product> pi = results.iterator(); pi.hasNext();) { Product p = pi.next();}

gonzobrains Over a year ago

Yeah, but this solution is old school and low-tech! Who couldn't possibly like it?

Salahin Rocky Over a year ago

It is not possible to cast (object[]) object array to a object like Foo

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