Isolating a portion of an object within an ArrayList
Say I have an ArrayList containing multiple objects. Each object holds an int, a string, and a double. How would I sort through the ArrayList, retrieving all the ints from each of the objects, and adding them all together?
I’m having so much trouble figuring out how to isolate just the integer... Yea I can print the object using the .get method, but then it returns the int, string, and double.
I don’t really need code, I just need someone to steer me in the right direction in how to isolate just the int from an object in an ArrayList.
Thank you!
java
asked Nov 21 at 8:11
Derek Sabourin
82
add a comment |
Say I have an ArrayList containing multiple objects. Each object holds an int, a string, and a double. How would I sort through the ArrayList, retrieving all the ints from each of the objects, and adding them all together?
I’m having so much trouble figuring out how to isolate just the integer... Yea I can print the object using the .get method, but then it returns the int, string, and double.
I don’t really need code, I just need someone to steer me in the right direction in how to isolate just the int from an object in an ArrayList.
Thank you!
java
asked Nov 21 at 8:11
Derek Sabourin
82
1
.map(x -> x.getTheIntegerField())
– Sofo Gial
Nov 21 at 8:15
This is not a place for questions like "how do I approach this problem". See the Tour in the question mark menu in the upper-right. The closest valid type of question is 'I tried these approaches and still having a problem"
– Mark Jeronimus
Nov 21 at 9:49
add a comment |
Say I have an ArrayList containing multiple objects. Each object holds an int, a string, and a double. How would I sort through the ArrayList, retrieving all the ints from each of the objects, and adding them all together?
I’m having so much trouble figuring out how to isolate just the integer... Yea I can print the object using the .get method, but then it returns the int, string, and double.
I don’t really need code, I just need someone to steer me in the right direction in how to isolate just the int from an object in an ArrayList.
Thank you!
java
asked Nov 21 at 8:11
Derek Sabourin
82
Say I have an ArrayList containing multiple objects. Each object holds an int, a string, and a double. How would I sort through the ArrayList, retrieving all the ints from each of the objects, and adding them all together?
I’m having so much trouble figuring out how to isolate just the integer... Yea I can print the object using the .get method, but then it returns the int, string, and double.
I don’t really need code, I just need someone to steer me in the right direction in how to isolate just the int from an object in an ArrayList.
Thank you!
java
java
asked Nov 21 at 8:11
Derek Sabourin
82
asked Nov 21 at 8:11
Derek Sabourin
82
asked Nov 21 at 8:11
Derek Sabourin
82
asked Nov 21 at 8:11
Derek Sabourin
82
asked Nov 21 at 8:11
Derek Sabourin
82
82
1
.map(x -> x.getTheIntegerField())
– Sofo Gial
Nov 21 at 8:15
This is not a place for questions like "how do I approach this problem". See the Tour in the question mark menu in the upper-right. The closest valid type of question is 'I tried these approaches and still having a problem"
– Mark Jeronimus
Nov 21 at 9:49
add a comment |
1
.map(x -> x.getTheIntegerField())
– Sofo Gial
Nov 21 at 8:15
This is not a place for questions like "how do I approach this problem". See the Tour in the question mark menu in the upper-right. The closest valid type of question is 'I tried these approaches and still having a problem"
– Mark Jeronimus
Nov 21 at 9:49
1
1
.map(x -> x.getTheIntegerField())– Sofo Gial
Nov 21 at 8:15
.map(x -> x.getTheIntegerField())– Sofo Gial
Nov 21 at 8:15
This is not a place for questions like "how do I approach this problem". See the Tour in the question mark menu in the upper-right. The closest valid type of question is 'I tried these approaches and still having a problem"
– Mark Jeronimus
Nov 21 at 9:49
This is not a place for questions like "how do I approach this problem". See the Tour in the question mark menu in the upper-right. The closest valid type of question is 'I tried these approaches and still having a problem"
– Mark Jeronimus
Nov 21 at 9:49
add a comment |
3 Answers
3
active
oldest
votes
You would get the Object, and then get the value from that Object using a better method.
EG - list.get(i).getMyInt().
Alternatively, this could be a nice application of Streams / Lamda’s - transform to convert from a Collection of yourObject to a Collection of Integers, and then sum these.
answered Nov 21 at 8:17
Jakg
405311
add a comment |
If you are using java 8 or above you can use streams:
objectList.stream().mapToInt(object -> object.getInt()).sum()It converts the list to a stream, then maps the values to ints and then it sums them up.
Hope this helps.
answered Nov 21 at 8:16
Andrei Dumitrescu-Tudor
18718
add a comment |
You can use typeof and then get a consistent type to do your operation
answered Nov 21 at 8:32
LoGan
111
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
You would get the Object, and then get the value from that Object using a better method.
EG - list.get(i).getMyInt().
Alternatively, this could be a nice application of Streams / Lamda’s - transform to convert from a Collection of yourObject to a Collection of Integers, and then sum these.
answered Nov 21 at 8:17
Jakg
405311
add a comment |
You would get the Object, and then get the value from that Object using a better method.
EG - list.get(i).getMyInt().
Alternatively, this could be a nice application of Streams / Lamda’s - transform to convert from a Collection of yourObject to a Collection of Integers, and then sum these.
answered Nov 21 at 8:17
Jakg
405311
add a comment |
You would get the Object, and then get the value from that Object using a better method.
EG - list.get(i).getMyInt().
Alternatively, this could be a nice application of Streams / Lamda’s - transform to convert from a Collection of yourObject to a Collection of Integers, and then sum these.
answered Nov 21 at 8:17
Jakg
405311
You would get the Object, and then get the value from that Object using a better method.
EG - list.get(i).getMyInt().
Alternatively, this could be a nice application of Streams / Lamda’s - transform to convert from a Collection of yourObject to a Collection of Integers, and then sum these.
answered Nov 21 at 8:17
Jakg
405311
answered Nov 21 at 8:17
Jakg
405311
answered Nov 21 at 8:17
Jakg
405311
answered Nov 21 at 8:17
Jakg
405311
405311
add a comment |
add a comment |
If you are using java 8 or above you can use streams:
objectList.stream().mapToInt(object -> object.getInt()).sum()It converts the list to a stream, then maps the values to ints and then it sums them up.
Hope this helps.
answered Nov 21 at 8:16
Andrei Dumitrescu-Tudor
18718
add a comment |
If you are using java 8 or above you can use streams:
objectList.stream().mapToInt(object -> object.getInt()).sum()It converts the list to a stream, then maps the values to ints and then it sums them up.
Hope this helps.
answered Nov 21 at 8:16
Andrei Dumitrescu-Tudor
18718
add a comment |
If you are using java 8 or above you can use streams:
objectList.stream().mapToInt(object -> object.getInt()).sum()It converts the list to a stream, then maps the values to ints and then it sums them up.
Hope this helps.
answered Nov 21 at 8:16
Andrei Dumitrescu-Tudor
18718
If you are using java 8 or above you can use streams:
objectList.stream().mapToInt(object -> object.getInt()).sum()It converts the list to a stream, then maps the values to ints and then it sums them up.
Hope this helps.
answered Nov 21 at 8:16
Andrei Dumitrescu-Tudor
18718
answered Nov 21 at 8:16
Andrei Dumitrescu-Tudor
18718
answered Nov 21 at 8:16
Andrei Dumitrescu-Tudor
18718
answered Nov 21 at 8:16
Andrei Dumitrescu-Tudor
18718
18718
add a comment |
add a comment |
You can use typeof and then get a consistent type to do your operation
answered Nov 21 at 8:32
LoGan
111
add a comment |
You can use typeof and then get a consistent type to do your operation
answered Nov 21 at 8:32
LoGan
111
add a comment |
You can use typeof and then get a consistent type to do your operation
answered Nov 21 at 8:32
LoGan
111
You can use typeof and then get a consistent type to do your operation
answered Nov 21 at 8:32
LoGan
111
answered Nov 21 at 8:32
LoGan
111
answered Nov 21 at 8:32
LoGan
111
answered Nov 21 at 8:32
LoGan
111
111
add a comment |
add a comment |
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1
.map(x -> x.getTheIntegerField())– Sofo Gial
Nov 21 at 8:15
This is not a place for questions like "how do I approach this problem". See the Tour in the question mark menu in the upper-right. The closest valid type of question is 'I tried these approaches and still having a problem"
– Mark Jeronimus
Nov 21 at 9:49