CODEWITHSUNDEEP
javaandroid
user1706819
user1706819

Reputation: 125

Getting value out of loop

I am trying to modify below code for my simple application needs. Since I am a beginner, sometimes it is hard to get some obvious for profi guys things. I want to get sum += p.price; out of the loop because when I click button second time it doubles result. I know that : is conditional operator but can not get meaning of this statement (Product p : boxAdapter.getBox()). Probably if someone will explain or transfer into do..while it will be easy to understand.

public void showResult(View v) {

    String result = "Items in the basket: ";
    String sum_text = "For the sum: ";

    for (Product p : boxAdapter.getBox()) {

        if (p.box) {
            result += "\n" + p.name + "   " + p.price;
        }

        sum += p.price;

    }

    Toast.makeText(this, result, Toast.LENGTH_LONG).show();
    Toast.makeText(this, sum_text + sum, Toast.LENGTH_LONG).show();
}

Sorry, for bothering with simple questions.

Upvotes: 1

Views: 945

Answers (2)

jeet
jeet

Reputation: 29199

for (Product p : boxAdapter.getBox())

this loop will iterate through, boxAdapter.getBox() collection of Product type, store each instance into p, to convert into simple for loop, change it to like:

for(int i=0; i<boxAdapter.getBox().size(); i++)
{
    Product p=boxAdapter.getBox().get(i);
}

Upvotes: 1

Michael
Michael

Reputation: 1477

for (Product p : boxAdapter.getBox()) means you iterate over every Product object in the result of boxAdapter.getBox().

If boxAdapter.getBox() for example returns a list containing 2 Product objects your loop will be executed 2 times and the first time p will be the first item from the list and the second time the second item from the list.

Upvotes: 0

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