Solved

Casting a Long to Integer

Posted on 2010-09-24
15
599 Views
Last Modified: 2012-05-10
I know that Long (int) isn't of type object. So perhaps cast is the wrong term to use.

But is there anyway to take an Object Integer and assign it a value Long?

Cheers
0
Comment
Question by:directxBOB
  • 4
  • 4
  • 3
  • +3
15 Comments
 
LVL 40

Accepted Solution

by:
gurvinder372 earned 200 total points
ID: 33753440
Long lnVar =  new Long(intValue);
0
 

Author Comment

by:directxBOB
ID: 33753497
Sorry should have posted an example

Integer freeMemory = Runtime.getRuntime().freeMemory();
0
 
LVL 40

Expert Comment

by:gurvinder372
ID: 33753527
Integer freeMemory = Runtime.getRuntime().freeMemory();

is not correct, since it already returns long
0
Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

 
LVL 40

Assisted Solution

by:gurvinder372
gurvinder372 earned 200 total points
ID: 33753534
it should be Long only

public class IntTOLong
{
      public static void main(String[] args) {
            // TODO Auto-generated method stub
            Long lnVar = Runtime.getRuntime().freeMemory();
      }
}


see this test program

let me know if i missed on something
0
 

Author Comment

by:directxBOB
ID: 33753543
yes I'm trying to

assign Integer a Long Value
0
 

Author Comment

by:directxBOB
ID: 33753550
The reason for using Integer is because I need to store these within a MAP and you cannot store an int or long in an MAP as it's not of type object.
0
 
LVL 40

Expert Comment

by:gurvinder372
ID: 33753573
But it is already returning the Long only, so why int is required. Did you checked the program i shared.

Long can be put into map

0
 
LVL 3

Assisted Solution

by:rgeers
rgeers earned 100 total points
ID: 33753601
Long freeMemory = Runtime.getRuntime().freeMemory();
int InVar = int myIntValue = unchecked((int)myLongValue);

It'll throw OverflowException in checked context if the value doesn't fit in an int
If you want to handle this you could check against int.MaxValue.
0
 
LVL 10

Assisted Solution

by:Hegemon
Hegemon earned 100 total points
ID: 33753629
int and long - (lowercase) - are primitives, that's why you can't store them in a map.
Integer and Long (uppercase) are classes wrapping these primitives.
You can put them into your map instead, i.e.

long longvalue = .... (get your long value);

myMap.put ("key", new Long (longValue));
0
 
LVL 3

Expert Comment

by:rgeers
ID: 33753641
echange the myLongValue for freeMemory, well guess you understood this
0
 
LVL 10

Expert Comment

by:Hegemon
ID: 33753647
Sorry, the declaration should begin with

long longValue = ...
0
 
LVL 3

Expert Comment

by:rgeers
ID: 33754618
Is your question about casting a Long to an int or about storing into a map?
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 33755693
There's no problem about Map
Map<Long, String> m = new HashMap<Long, String>();
m.put(Runtime.getRuntime().freeMemory(), "foo");


Map<String, Long> m = new HashMap<String, Long>();
m.put("foo", Runtime.getRuntime().freeMemory());

Open in new window

0
 
LVL 92

Assisted Solution

by:objects
objects earned 100 total points
ID: 33757976
you cannout cast it, you'll need to create a new Long

Integer i = new Integer(5);
Long l = new Long(i.longValue());
0
 

Author Closing Comment

by:directxBOB
ID: 33838928
Thanks, the problem turned out that I was trying to put a primitive in the Map. So by using Integer and Long got around the problem. Thanks
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
JDeveloper 12c for 32 bit 4 84
object oriented programming comparison 5 72
xampp tool 12 49
MySqlDump not dumping triggers 1 31
INTRODUCTION Working with files is a moderately common task in Java.  For most projects hard coding the file names, using parameters in configuration files, or using command-line arguments is sufficient.   However, when your application has vi…
Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts. Introduce Scanner class: Importing…
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…

773 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question