Accessing objects/variables inside of a for loop

Question

Is there a way to access the object "rec" after the for loop when I try to print out rec.report()?

(Report() is a method inside of the class BmiRecord that returns new calculated results).

for(int i=0; i<limit; i++)
{
     int height = scanner.nextInt();
     int weight = scanner.nextInt();
     String name = scanner.nextLine();

     BmiRecord rec = new BmiRecord(name, height, weight);
} 

    System.out.println(rec.report());

Because of scope. google.com/… The workaround is to define the object BmiRecord rec = null outside for for loop, then only assign it inside the loop. Then you can use it after the loop terminates — Kon
– Kon, Commented Apr 2, 2015 at 15:40
Rec is defined inside the loop. So it no long exists outside. — shibley
– shibley, Commented Apr 2, 2015 at 15:41
Each thing has a scope and it is not visible outside that. In this case the for loop has a scope delimited by curly braces — Andrea
– Andrea, Commented Apr 2, 2015 at 15:41
Either do what @Kon wrote, or create a collection like 'List<BmiRecord> records = new ArrayList<>();' and then add the records to it: 'records.add(rec);'. Later you can iterate over that list (examples can be found on Google or Stackoverflow) to print each entry. — Tom
– Tom, Commented Apr 2, 2015 at 15:49

Touchstone · Accepted Answer · 2015-04-02 15:51:37Z

2

You cannot access the object rec outside the for loop because the scope of the object is only valid in the for loop. As you have created that object inside the for loop.

You can relate this with another question. Why can't you access the local variable defined inside a function in another function?

Refer the following code:

BmiRecord rec[]=new BmiRecord[limit];

for(int i=0; i<limit; i++)
{
 int height = scanner.nextInt();
 int weight = scanner.nextInt();
 String name = scanner.nextLine();

 rec[i] = new BmiRecord(name, height, weight);
} 
for(BmiRecord re:rec){
     System.out.println(re.report);
}

edited Apr 2, 2015 at 15:51

answered Apr 2, 2015 at 15:44

Touchstone

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3 Comments

Michael Miller Over a year ago

Is there any way to access the object "rec"?

Tom Over a year ago

An array is not wrong, but using a Collection instead is almost always the better decision. Just a note, no need to update your answer :).

Touchstone Over a year ago

You are right. However, OP seems to be new to the language that's why I skipped the Collection part.

codelearner · Accepted Answer · 2015-04-02 16:14:14Z

1

Because rec is a private variable defined within the for loop. To access outside of it's scope you need to define it before the for loop. Here is your new code:

BmiRecord rec;

for(int i=0; i<limit; i++)
{
 int height = scanner.nextInt();
 int weight = scanner.nextInt();
 String name = scanner.nextLine();

 rec = new BmiRecord(name, height, weight);
} 

System.out.println(rec.report());

edited Apr 2, 2015 at 16:14

answered Apr 2, 2015 at 15:45

codelearner

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Comments

deepak verma · Accepted Answer · 2015-04-02 15:46:06Z

0

You are accessing object outside of loop which is out of scope, try something like this

    BmiRecord rec = null;
    for (int i = 0; i < limit; i++) {
        int height = scanner.nextInt();
        int weight = scanner.nextInt();
        String name = scanner.nextLine();

        rec = new BmiRecord(name, height, weight);
    }

    System.out.println(rec.report());

answered Apr 2, 2015 at 15:46

deepak verma

1

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