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How is it possible to add a double into an ArrayList of Integer? (Java)



The Next CEO of Stack OverflowJava generics type erasure: when and what happens?type erasure in implementation of ArrayList in JavaHow do I efficiently iterate over each entry in a Java Map?How do I call one constructor from another in Java?How do I read / convert an InputStream into a String in Java?When to use LinkedList over ArrayList in Java?How do I generate random integers within a specific range in Java?How do I determine whether an array contains a particular value in Java?How do I declare and initialize an array in Java?How to split a string in JavaConverting 'ArrayList<String> to 'String[]' in JavaHow do I convert a String to an int in Java?










16















I try to understand how is it possible to have a Double value into an ArrayList of Integer. The numList is an ArrayList of Integer, and the value from it is a Double.



This is the code:



package bounded.wildcards;

import java.util.ArrayList;
import java.util.List;

public class GenericsDemo

public static void main(String[] args)
// Invariance Workaround
List<Integer> numList = new ArrayList<>();
GenericsDemo.invarianceWorkaround(numList);
System.out.println(numList);


static <T extends Number> void invarianceWorkaround(List<T> list)

T element = (T) new Double(23.3);
list.add(element);





This will compile and run without an error.










share|improve this question



















  • 2





    Possible duplicate of type erasure in implementation of ArrayList in Java

    – vaxquis
    yesterday






  • 1





    also, stackoverflow.com/questions/339699/… and many others... I think that someone can find an exact duplicate, but they are are extremely closely related.

    – vaxquis
    yesterday











  • Thank you for the links, I know about type erasure and add cast, but I cannot understand how is it possible to have an ArrayList of Integer with this Double value in it. And there is no exception when I run it.

    – gaby
    yesterday







  • 1





    @gabv you're contradicting yourself. If you knew about type erasure, you'd understand why you can add anything to ArrayList<Double> at runtime... because the answer is because of type erasure. As such, it follows you must either not know about type erasure mechanism in Java or not understand it, which both mean you should learn more about it.

    – vaxquis
    yesterday
















16















I try to understand how is it possible to have a Double value into an ArrayList of Integer. The numList is an ArrayList of Integer, and the value from it is a Double.



This is the code:



package bounded.wildcards;

import java.util.ArrayList;
import java.util.List;

public class GenericsDemo

public static void main(String[] args)
// Invariance Workaround
List<Integer> numList = new ArrayList<>();
GenericsDemo.invarianceWorkaround(numList);
System.out.println(numList);


static <T extends Number> void invarianceWorkaround(List<T> list)

T element = (T) new Double(23.3);
list.add(element);





This will compile and run without an error.










share|improve this question



















  • 2





    Possible duplicate of type erasure in implementation of ArrayList in Java

    – vaxquis
    yesterday






  • 1





    also, stackoverflow.com/questions/339699/… and many others... I think that someone can find an exact duplicate, but they are are extremely closely related.

    – vaxquis
    yesterday











  • Thank you for the links, I know about type erasure and add cast, but I cannot understand how is it possible to have an ArrayList of Integer with this Double value in it. And there is no exception when I run it.

    – gaby
    yesterday







  • 1





    @gabv you're contradicting yourself. If you knew about type erasure, you'd understand why you can add anything to ArrayList<Double> at runtime... because the answer is because of type erasure. As such, it follows you must either not know about type erasure mechanism in Java or not understand it, which both mean you should learn more about it.

    – vaxquis
    yesterday














16












16








16


2






I try to understand how is it possible to have a Double value into an ArrayList of Integer. The numList is an ArrayList of Integer, and the value from it is a Double.



This is the code:



package bounded.wildcards;

import java.util.ArrayList;
import java.util.List;

public class GenericsDemo

public static void main(String[] args)
// Invariance Workaround
List<Integer> numList = new ArrayList<>();
GenericsDemo.invarianceWorkaround(numList);
System.out.println(numList);


static <T extends Number> void invarianceWorkaround(List<T> list)

T element = (T) new Double(23.3);
list.add(element);





This will compile and run without an error.










share|improve this question
















I try to understand how is it possible to have a Double value into an ArrayList of Integer. The numList is an ArrayList of Integer, and the value from it is a Double.



This is the code:



package bounded.wildcards;

import java.util.ArrayList;
import java.util.List;

public class GenericsDemo

public static void main(String[] args)
// Invariance Workaround
List<Integer> numList = new ArrayList<>();
GenericsDemo.invarianceWorkaround(numList);
System.out.println(numList);


static <T extends Number> void invarianceWorkaround(List<T> list)

T element = (T) new Double(23.3);
list.add(element);





This will compile and run without an error.







java generics arraylist






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited yesterday







gaby

















asked yesterday









gabygaby

51912




51912







  • 2





    Possible duplicate of type erasure in implementation of ArrayList in Java

    – vaxquis
    yesterday






  • 1





    also, stackoverflow.com/questions/339699/… and many others... I think that someone can find an exact duplicate, but they are are extremely closely related.

    – vaxquis
    yesterday











  • Thank you for the links, I know about type erasure and add cast, but I cannot understand how is it possible to have an ArrayList of Integer with this Double value in it. And there is no exception when I run it.

    – gaby
    yesterday







  • 1





    @gabv you're contradicting yourself. If you knew about type erasure, you'd understand why you can add anything to ArrayList<Double> at runtime... because the answer is because of type erasure. As such, it follows you must either not know about type erasure mechanism in Java or not understand it, which both mean you should learn more about it.

    – vaxquis
    yesterday













  • 2





    Possible duplicate of type erasure in implementation of ArrayList in Java

    – vaxquis
    yesterday






  • 1





    also, stackoverflow.com/questions/339699/… and many others... I think that someone can find an exact duplicate, but they are are extremely closely related.

    – vaxquis
    yesterday











  • Thank you for the links, I know about type erasure and add cast, but I cannot understand how is it possible to have an ArrayList of Integer with this Double value in it. And there is no exception when I run it.

    – gaby
    yesterday







  • 1





    @gabv you're contradicting yourself. If you knew about type erasure, you'd understand why you can add anything to ArrayList<Double> at runtime... because the answer is because of type erasure. As such, it follows you must either not know about type erasure mechanism in Java or not understand it, which both mean you should learn more about it.

    – vaxquis
    yesterday








2




2





Possible duplicate of type erasure in implementation of ArrayList in Java

– vaxquis
yesterday





Possible duplicate of type erasure in implementation of ArrayList in Java

– vaxquis
yesterday




1




1





also, stackoverflow.com/questions/339699/… and many others... I think that someone can find an exact duplicate, but they are are extremely closely related.

– vaxquis
yesterday





also, stackoverflow.com/questions/339699/… and many others... I think that someone can find an exact duplicate, but they are are extremely closely related.

– vaxquis
yesterday













Thank you for the links, I know about type erasure and add cast, but I cannot understand how is it possible to have an ArrayList of Integer with this Double value in it. And there is no exception when I run it.

– gaby
yesterday






Thank you for the links, I know about type erasure and add cast, but I cannot understand how is it possible to have an ArrayList of Integer with this Double value in it. And there is no exception when I run it.

– gaby
yesterday





1




1





@gabv you're contradicting yourself. If you knew about type erasure, you'd understand why you can add anything to ArrayList<Double> at runtime... because the answer is because of type erasure. As such, it follows you must either not know about type erasure mechanism in Java or not understand it, which both mean you should learn more about it.

– vaxquis
yesterday






@gabv you're contradicting yourself. If you knew about type erasure, you'd understand why you can add anything to ArrayList<Double> at runtime... because the answer is because of type erasure. As such, it follows you must either not know about type erasure mechanism in Java or not understand it, which both mean you should learn more about it.

– vaxquis
yesterday













1 Answer
1






active

oldest

votes


















20














This is because of type erasure used with Java generics - the type checks are only performed at compile time for generic types, and the type info for generics is then erased, effectively turning List<Integer> into List<Object>.



My IDE warns you of an "Unchecked cast from Double to T". But the compiler couldn't be sure that your code is wrong, so it does not emit an error, just a warning.



Then at runtime, the type check is no longer present due to type erasure, so the code will run without error unless you perform some operation that fails due to incompatible runtime type. System.out.println() is not such operation.




If you change the print code to



Integer num = numList.get(0);
System.out.println(num);


this will now involve runtime type check and will therefore fail:




java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Integer







share|improve this answer




















  • 3





    Note that a ClassCastException is emitted when one tries to do this: Integer i = numList.get(0).

    – MC Emperor
    yesterday











  • @MCEmperor Thanks, added. I couldn't find a simple example to force type incompatibility - integer seems to basically have no meaningful methods that wouldn't either be static or already in Number.

    – Jiri Tousek
    yesterday






  • 2





    @JiriTousek You may be interested in Java is Unsound. Basically all java compilers will add cast checks in places to avoid issues because they know that the type system is broken.

    – Giacomo Alzetta
    yesterday











  • effectively turning into List<Number> not List<Object> because of upper bound is Number. if its List<Object> then you can store String but you can't

    – Akash Shah
    yesterday












  • @AkashShah I disagree: List<String> stringList = (List) numList; stringList.add("abc");. Lots of compiler warnings, but compiles and runs nevertheless.

    – Jiri Tousek
    yesterday











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1 Answer
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active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









20














This is because of type erasure used with Java generics - the type checks are only performed at compile time for generic types, and the type info for generics is then erased, effectively turning List<Integer> into List<Object>.



My IDE warns you of an "Unchecked cast from Double to T". But the compiler couldn't be sure that your code is wrong, so it does not emit an error, just a warning.



Then at runtime, the type check is no longer present due to type erasure, so the code will run without error unless you perform some operation that fails due to incompatible runtime type. System.out.println() is not such operation.




If you change the print code to



Integer num = numList.get(0);
System.out.println(num);


this will now involve runtime type check and will therefore fail:




java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Integer







share|improve this answer




















  • 3





    Note that a ClassCastException is emitted when one tries to do this: Integer i = numList.get(0).

    – MC Emperor
    yesterday











  • @MCEmperor Thanks, added. I couldn't find a simple example to force type incompatibility - integer seems to basically have no meaningful methods that wouldn't either be static or already in Number.

    – Jiri Tousek
    yesterday






  • 2





    @JiriTousek You may be interested in Java is Unsound. Basically all java compilers will add cast checks in places to avoid issues because they know that the type system is broken.

    – Giacomo Alzetta
    yesterday











  • effectively turning into List<Number> not List<Object> because of upper bound is Number. if its List<Object> then you can store String but you can't

    – Akash Shah
    yesterday












  • @AkashShah I disagree: List<String> stringList = (List) numList; stringList.add("abc");. Lots of compiler warnings, but compiles and runs nevertheless.

    – Jiri Tousek
    yesterday















20














This is because of type erasure used with Java generics - the type checks are only performed at compile time for generic types, and the type info for generics is then erased, effectively turning List<Integer> into List<Object>.



My IDE warns you of an "Unchecked cast from Double to T". But the compiler couldn't be sure that your code is wrong, so it does not emit an error, just a warning.



Then at runtime, the type check is no longer present due to type erasure, so the code will run without error unless you perform some operation that fails due to incompatible runtime type. System.out.println() is not such operation.




If you change the print code to



Integer num = numList.get(0);
System.out.println(num);


this will now involve runtime type check and will therefore fail:




java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Integer







share|improve this answer




















  • 3





    Note that a ClassCastException is emitted when one tries to do this: Integer i = numList.get(0).

    – MC Emperor
    yesterday











  • @MCEmperor Thanks, added. I couldn't find a simple example to force type incompatibility - integer seems to basically have no meaningful methods that wouldn't either be static or already in Number.

    – Jiri Tousek
    yesterday






  • 2





    @JiriTousek You may be interested in Java is Unsound. Basically all java compilers will add cast checks in places to avoid issues because they know that the type system is broken.

    – Giacomo Alzetta
    yesterday











  • effectively turning into List<Number> not List<Object> because of upper bound is Number. if its List<Object> then you can store String but you can't

    – Akash Shah
    yesterday












  • @AkashShah I disagree: List<String> stringList = (List) numList; stringList.add("abc");. Lots of compiler warnings, but compiles and runs nevertheless.

    – Jiri Tousek
    yesterday













20












20








20







This is because of type erasure used with Java generics - the type checks are only performed at compile time for generic types, and the type info for generics is then erased, effectively turning List<Integer> into List<Object>.



My IDE warns you of an "Unchecked cast from Double to T". But the compiler couldn't be sure that your code is wrong, so it does not emit an error, just a warning.



Then at runtime, the type check is no longer present due to type erasure, so the code will run without error unless you perform some operation that fails due to incompatible runtime type. System.out.println() is not such operation.




If you change the print code to



Integer num = numList.get(0);
System.out.println(num);


this will now involve runtime type check and will therefore fail:




java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Integer







share|improve this answer















This is because of type erasure used with Java generics - the type checks are only performed at compile time for generic types, and the type info for generics is then erased, effectively turning List<Integer> into List<Object>.



My IDE warns you of an "Unchecked cast from Double to T". But the compiler couldn't be sure that your code is wrong, so it does not emit an error, just a warning.



Then at runtime, the type check is no longer present due to type erasure, so the code will run without error unless you perform some operation that fails due to incompatible runtime type. System.out.println() is not such operation.




If you change the print code to



Integer num = numList.get(0);
System.out.println(num);


this will now involve runtime type check and will therefore fail:




java.lang.ClassCastException: java.lang.Double cannot be cast to java.lang.Integer








share|improve this answer














share|improve this answer



share|improve this answer








edited yesterday

























answered yesterday









Jiri TousekJiri Tousek

10.5k52240




10.5k52240







  • 3





    Note that a ClassCastException is emitted when one tries to do this: Integer i = numList.get(0).

    – MC Emperor
    yesterday











  • @MCEmperor Thanks, added. I couldn't find a simple example to force type incompatibility - integer seems to basically have no meaningful methods that wouldn't either be static or already in Number.

    – Jiri Tousek
    yesterday






  • 2





    @JiriTousek You may be interested in Java is Unsound. Basically all java compilers will add cast checks in places to avoid issues because they know that the type system is broken.

    – Giacomo Alzetta
    yesterday











  • effectively turning into List<Number> not List<Object> because of upper bound is Number. if its List<Object> then you can store String but you can't

    – Akash Shah
    yesterday












  • @AkashShah I disagree: List<String> stringList = (List) numList; stringList.add("abc");. Lots of compiler warnings, but compiles and runs nevertheless.

    – Jiri Tousek
    yesterday












  • 3





    Note that a ClassCastException is emitted when one tries to do this: Integer i = numList.get(0).

    – MC Emperor
    yesterday











  • @MCEmperor Thanks, added. I couldn't find a simple example to force type incompatibility - integer seems to basically have no meaningful methods that wouldn't either be static or already in Number.

    – Jiri Tousek
    yesterday






  • 2





    @JiriTousek You may be interested in Java is Unsound. Basically all java compilers will add cast checks in places to avoid issues because they know that the type system is broken.

    – Giacomo Alzetta
    yesterday











  • effectively turning into List<Number> not List<Object> because of upper bound is Number. if its List<Object> then you can store String but you can't

    – Akash Shah
    yesterday












  • @AkashShah I disagree: List<String> stringList = (List) numList; stringList.add("abc");. Lots of compiler warnings, but compiles and runs nevertheless.

    – Jiri Tousek
    yesterday







3




3





Note that a ClassCastException is emitted when one tries to do this: Integer i = numList.get(0).

– MC Emperor
yesterday





Note that a ClassCastException is emitted when one tries to do this: Integer i = numList.get(0).

– MC Emperor
yesterday













@MCEmperor Thanks, added. I couldn't find a simple example to force type incompatibility - integer seems to basically have no meaningful methods that wouldn't either be static or already in Number.

– Jiri Tousek
yesterday





@MCEmperor Thanks, added. I couldn't find a simple example to force type incompatibility - integer seems to basically have no meaningful methods that wouldn't either be static or already in Number.

– Jiri Tousek
yesterday




2




2





@JiriTousek You may be interested in Java is Unsound. Basically all java compilers will add cast checks in places to avoid issues because they know that the type system is broken.

– Giacomo Alzetta
yesterday





@JiriTousek You may be interested in Java is Unsound. Basically all java compilers will add cast checks in places to avoid issues because they know that the type system is broken.

– Giacomo Alzetta
yesterday













effectively turning into List<Number> not List<Object> because of upper bound is Number. if its List<Object> then you can store String but you can't

– Akash Shah
yesterday






effectively turning into List<Number> not List<Object> because of upper bound is Number. if its List<Object> then you can store String but you can't

– Akash Shah
yesterday














@AkashShah I disagree: List<String> stringList = (List) numList; stringList.add("abc");. Lots of compiler warnings, but compiles and runs nevertheless.

– Jiri Tousek
yesterday





@AkashShah I disagree: List<String> stringList = (List) numList; stringList.add("abc");. Lots of compiler warnings, but compiles and runs nevertheless.

– Jiri Tousek
yesterday



















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Romeo and Juliet ContentsCharactersSynopsisSourcesDate and textThemes and motifsCriticism and interpretationLegacyScene by sceneSee alsoNotes and referencesSourcesExternal linksNavigation menu"Consumer Price Index (estimate) 1800–"10.2307/28710160037-3222287101610.1093/res/II.5.31910.2307/45967845967810.2307/2869925286992510.1525/jams.1982.35.3.03a00050"Dada Masilo: South African dancer who breaks the rules"10.1093/res/os-XV.57.1610.2307/28680942868094"Sweet Sorrow: Mann-Korman's Romeo and Juliet Closes Sept. 5 at MN's Ordway"the original10.2307/45957745957710.1017/CCOL0521570476.009"Ram Leela box office collections hit massive Rs 100 crore, pulverises prediction"Archived"Broadway Revival of Romeo and Juliet, Starring Orlando Bloom and Condola Rashad, Will Close Dec. 8"Archived10.1075/jhp.7.1.04hon"Wherefore art thou, Romeo? To make us laugh at Navy Pier"the original10.1093/gmo/9781561592630.article.O006772"Ram-leela Review Roundup: Critics Hail Film as Best Adaptation of Romeo and Juliet"Archived10.2307/31946310047-77293194631"Romeo and Juliet get Twitter treatment""Juliet's Nurse by Lois Leveen""Romeo and Juliet: Orlando Bloom's Broadway Debut Released in Theaters for Valentine's Day"Archived"Romeo and Juliet Has No Balcony"10.1093/gmo/9781561592630.article.O00778110.2307/2867423286742310.1076/enst.82.2.115.959510.1080/00138380601042675"A plague o' both your houses: error in GCSE exam paper forces apology""Juliet of the Five O'Clock Shadow, and Other Wonders"10.2307/33912430027-4321339124310.2307/28487440038-7134284874410.2307/29123140149-661129123144728341M"Weekender Guide: Shakespeare on The Drive""balcony"UK public library membership"romeo"UK public library membership10.1017/CCOL9780521844291"Post-Zionist Critique on Israel and the Palestinians Part III: Popular Culture"10.2307/25379071533-86140377-919X2537907"Capulets and Montagues: UK exam board admit mixing names up in Romeo and Juliet paper"Istoria Novellamente Ritrovata di Due Nobili Amanti2027/mdp.390150822329610820-750X"GCSE exam error: Board accidentally rewrites Shakespeare"10.2307/29176390149-66112917639"Exam board apologises after error in English GCSE paper which confused characters in Shakespeare's Romeo and Juliet""From Mariotto and Ganozza to Romeo and Guilietta: Metamorphoses of a Renaissance Tale"10.2307/37323537323510.2307/2867455286745510.2307/28678912867891"10 Questions for Taylor Swift"10.2307/28680922868092"Haymarket Theatre""The Zeffirelli Way: Revealing Talk by Florentine Director""Michael Smuin: 1938-2007 / Prolific dance director had showy career"The Life and Art of Edwin BoothRomeo and JulietRomeo and JulietRomeo and JulietRomeo and JulietEasy Read Romeo and JulietRomeo and Julieteeecb12003684p(data)4099369-3n8211610759dbe00d-a9e2-41a3-b2c1-977dd692899302814385X313670221313670221