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Difference between List super T> and List
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I was going through generics in Java and I'm having trouble trying to understand where I would use the following two.
I understand that the first myList would ensure that the list only contains elements of type Integer and all it's superclasses. Now I'm trying to figure out where myList2 would fit in here.
List<? super Integer> myList;
List<Class<? super Integer>> myList2;
Edit: It's not a duplicate of the question being linked...since this is clearly regarding the use of ? vs Class<? whereas the other question is about super vs extend
java
asked Mar 25 at 21:26
AsadSMalikAsadSMalik
3479 silver badges27 bronze badges
|
show 1 more comment
I was going through generics in Java and I'm having trouble trying to understand where I would use the following two.
I understand that the first myList would ensure that the list only contains elements of type Integer and all it's superclasses. Now I'm trying to figure out where myList2 would fit in here.
List<? super Integer> myList;
List<Class<? super Integer>> myList2;
Edit: It's not a duplicate of the question being linked...since this is clearly regarding the use of ? vs Class<? whereas the other question is about super vs extend
java
asked Mar 25 at 21:26
AsadSMalikAsadSMalik
3479 silver badges27 bronze badges
myList2.add(Integer.class);
– Ruslan
Mar 25 at 21:32
Possible duplicate of What is a difference between <? super E> and <? extends E>?
– LppEdd
Mar 25 at 21:32
2
myListis a list of object instances, e.g. aList<Number>storingInteger,Double,BigDecimal, ... objects, such as42,3.14159,3e9876, ... ---myList2is a list ofClassobjects, i.e. a list ofInteger.class,Number.class,Object.class,Serializable.class, orComparable.classvalues.
– Andreas
Mar 25 at 21:33
I understand the difference between super and extends. I was just wondering where myList2 would be used.
– AsadSMalik
Mar 25 at 21:33
1
I can't offhand think of a use for a list of class objects, but in general you use a Class object as a way to indicate type, or as a way to determine the properties of that type.
– another-dave
Mar 25 at 21:53
|
show 1 more comment
I was going through generics in Java and I'm having trouble trying to understand where I would use the following two.
I understand that the first myList would ensure that the list only contains elements of type Integer and all it's superclasses. Now I'm trying to figure out where myList2 would fit in here.
List<? super Integer> myList;
List<Class<? super Integer>> myList2;
Edit: It's not a duplicate of the question being linked...since this is clearly regarding the use of ? vs Class<? whereas the other question is about super vs extend
java
asked Mar 25 at 21:26
AsadSMalikAsadSMalik
3479 silver badges27 bronze badges
I was going through generics in Java and I'm having trouble trying to understand where I would use the following two.
I understand that the first myList would ensure that the list only contains elements of type Integer and all it's superclasses. Now I'm trying to figure out where myList2 would fit in here.
List<? super Integer> myList;
List<Class<? super Integer>> myList2;
Edit: It's not a duplicate of the question being linked...since this is clearly regarding the use of ? vs Class<? whereas the other question is about super vs extend
java
java
asked Mar 25 at 21:26
AsadSMalikAsadSMalik
3479 silver badges27 bronze badges
asked Mar 25 at 21:26
AsadSMalikAsadSMalik
3479 silver badges27 bronze badges
edited Mar 25 at 21:37
AsadSMalik
asked Mar 25 at 21:26
AsadSMalikAsadSMalik
3479 silver badges27 bronze badges
asked Mar 25 at 21:26
AsadSMalikAsadSMalik
3479 silver badges27 bronze badges
asked Mar 25 at 21:26
AsadSMalikAsadSMalik
3479 silver badges27 bronze badges
3479 silver badges27 bronze badges
myList2.add(Integer.class);
– Ruslan
Mar 25 at 21:32
Possible duplicate of What is a difference between <? super E> and <? extends E>?
– LppEdd
Mar 25 at 21:32
2
myListis a list of object instances, e.g. aList<Number>storingInteger,Double,BigDecimal, ... objects, such as42,3.14159,3e9876, ... ---myList2is a list ofClassobjects, i.e. a list ofInteger.class,Number.class,Object.class,Serializable.class, orComparable.classvalues.
– Andreas
Mar 25 at 21:33
I understand the difference between super and extends. I was just wondering where myList2 would be used.
– AsadSMalik
Mar 25 at 21:33
1
I can't offhand think of a use for a list of class objects, but in general you use a Class object as a way to indicate type, or as a way to determine the properties of that type.
– another-dave
Mar 25 at 21:53
|
show 1 more comment
myList2.add(Integer.class);
– Ruslan
Mar 25 at 21:32
Possible duplicate of What is a difference between <? super E> and <? extends E>?
– LppEdd
Mar 25 at 21:32
2
myListis a list of object instances, e.g. aList<Number>storingInteger,Double,BigDecimal, ... objects, such as42,3.14159,3e9876, ... ---myList2is a list ofClassobjects, i.e. a list ofInteger.class,Number.class,Object.class,Serializable.class, orComparable.classvalues.
– Andreas
Mar 25 at 21:33
I understand the difference between super and extends. I was just wondering where myList2 would be used.
– AsadSMalik
Mar 25 at 21:33
1
I can't offhand think of a use for a list of class objects, but in general you use a Class object as a way to indicate type, or as a way to determine the properties of that type.
– another-dave
Mar 25 at 21:53
myList2.add(Integer.class);– Ruslan
Mar 25 at 21:32
myList2.add(Integer.class);– Ruslan
Mar 25 at 21:32
Possible duplicate of What is a difference between <? super E> and <? extends E>?
– LppEdd
Mar 25 at 21:32
Possible duplicate of What is a difference between <? super E> and <? extends E>?
– LppEdd
Mar 25 at 21:32
2
2
myList is a list of object instances, e.g. a List<Number> storing Integer, Double, BigDecimal, ... objects, such as 42, 3.14159, 3e9876, ... --- myList2 is a list of Class objects, i.e. a list of Integer.class, Number.class, Object.class, Serializable.class, or Comparable.class values.– Andreas
Mar 25 at 21:33
myList is a list of object instances, e.g. a List<Number> storing Integer, Double, BigDecimal, ... objects, such as 42, 3.14159, 3e9876, ... --- myList2 is a list of Class objects, i.e. a list of Integer.class, Number.class, Object.class, Serializable.class, or Comparable.class values.– Andreas
Mar 25 at 21:33
I understand the difference between super and extends. I was just wondering where myList2 would be used.
– AsadSMalik
Mar 25 at 21:33
I understand the difference between super and extends. I was just wondering where myList2 would be used.
– AsadSMalik
Mar 25 at 21:33
1
1
I can't offhand think of a use for a list of class objects, but in general you use a Class object as a way to indicate type, or as a way to determine the properties of that type.
– another-dave
Mar 25 at 21:53
I can't offhand think of a use for a list of class objects, but in general you use a Class object as a way to indicate type, or as a way to determine the properties of that type.
– another-dave
Mar 25 at 21:53
|
show 1 more comment
2 Answers
2
active
oldest
votes
The first one, 'myList' may contain integer values. Example: myList.add(200);
The second one, 'myList2' may contain classes of type integer. Example: myList2.add(Integer.class);
answered Mar 25 at 21:33
Andreas VoglAndreas Vogl
7735 silver badges12 bronze badges
Ok so like you mentioned in the comments, if instead of Integer, I'm extending Number, then the second list could contain elements Integer, BigDecimal etc.
– AsadSMalik
Mar 25 at 21:34
The first list might also contain e.g.Stringvalues, because it might be aList<Object>. --- The second list can also store classes of other types, e.g.Number.class,Object.class,Serializable.class, andComparable.class.
– Andreas
Mar 25 at 21:35
add a comment |
The first list contains objects of Integer and its superclasses.
The second one contains class objects (or simply classes) of Integer and its superclasses, i.e:
Integer.class;
Number.class;
You can read more about the differences here: The difference between Classes, Objects, and Instances
answered Mar 25 at 21:33
Pavel SmirnovPavel Smirnov
2,7692 gold badges9 silver badges18 bronze badges
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
The first one, 'myList' may contain integer values. Example: myList.add(200);
The second one, 'myList2' may contain classes of type integer. Example: myList2.add(Integer.class);
answered Mar 25 at 21:33
Andreas VoglAndreas Vogl
7735 silver badges12 bronze badges
Ok so like you mentioned in the comments, if instead of Integer, I'm extending Number, then the second list could contain elements Integer, BigDecimal etc.
– AsadSMalik
Mar 25 at 21:34
The first list might also contain e.g.Stringvalues, because it might be aList<Object>. --- The second list can also store classes of other types, e.g.Number.class,Object.class,Serializable.class, andComparable.class.
– Andreas
Mar 25 at 21:35
add a comment |
The first one, 'myList' may contain integer values. Example: myList.add(200);
The second one, 'myList2' may contain classes of type integer. Example: myList2.add(Integer.class);
answered Mar 25 at 21:33
Andreas VoglAndreas Vogl
7735 silver badges12 bronze badges
Ok so like you mentioned in the comments, if instead of Integer, I'm extending Number, then the second list could contain elements Integer, BigDecimal etc.
– AsadSMalik
Mar 25 at 21:34
The first list might also contain e.g.Stringvalues, because it might be aList<Object>. --- The second list can also store classes of other types, e.g.Number.class,Object.class,Serializable.class, andComparable.class.
– Andreas
Mar 25 at 21:35
add a comment |
The first one, 'myList' may contain integer values. Example: myList.add(200);
The second one, 'myList2' may contain classes of type integer. Example: myList2.add(Integer.class);
answered Mar 25 at 21:33
Andreas VoglAndreas Vogl
7735 silver badges12 bronze badges
The first one, 'myList' may contain integer values. Example: myList.add(200);
The second one, 'myList2' may contain classes of type integer. Example: myList2.add(Integer.class);
answered Mar 25 at 21:33
Andreas VoglAndreas Vogl
7735 silver badges12 bronze badges
answered Mar 25 at 21:33
Andreas VoglAndreas Vogl
7735 silver badges12 bronze badges
answered Mar 25 at 21:33
Andreas VoglAndreas Vogl
7735 silver badges12 bronze badges
answered Mar 25 at 21:33
Andreas VoglAndreas Vogl
7735 silver badges12 bronze badges
7735 silver badges12 bronze badges
Ok so like you mentioned in the comments, if instead of Integer, I'm extending Number, then the second list could contain elements Integer, BigDecimal etc.
– AsadSMalik
Mar 25 at 21:34
The first list might also contain e.g.Stringvalues, because it might be aList<Object>. --- The second list can also store classes of other types, e.g.Number.class,Object.class,Serializable.class, andComparable.class.
– Andreas
Mar 25 at 21:35
add a comment |
Ok so like you mentioned in the comments, if instead of Integer, I'm extending Number, then the second list could contain elements Integer, BigDecimal etc.
– AsadSMalik
Mar 25 at 21:34
The first list might also contain e.g.Stringvalues, because it might be aList<Object>. --- The second list can also store classes of other types, e.g.Number.class,Object.class,Serializable.class, andComparable.class.
– Andreas
Mar 25 at 21:35
Ok so like you mentioned in the comments, if instead of Integer, I'm extending Number, then the second list could contain elements Integer, BigDecimal etc.
– AsadSMalik
Mar 25 at 21:34
Ok so like you mentioned in the comments, if instead of Integer, I'm extending Number, then the second list could contain elements Integer, BigDecimal etc.
– AsadSMalik
Mar 25 at 21:34
The first list might also contain e.g.
String values, because it might be a List<Object>. --- The second list can also store classes of other types, e.g. Number.class, Object.class, Serializable.class, and Comparable.class.– Andreas
Mar 25 at 21:35
The first list might also contain e.g.
String values, because it might be a List<Object>. --- The second list can also store classes of other types, e.g. Number.class, Object.class, Serializable.class, and Comparable.class.– Andreas
Mar 25 at 21:35
add a comment |
The first list contains objects of Integer and its superclasses.
The second one contains class objects (or simply classes) of Integer and its superclasses, i.e:
Integer.class;
Number.class;
You can read more about the differences here: The difference between Classes, Objects, and Instances
answered Mar 25 at 21:33
Pavel SmirnovPavel Smirnov
2,7692 gold badges9 silver badges18 bronze badges
add a comment |
The first list contains objects of Integer and its superclasses.
The second one contains class objects (or simply classes) of Integer and its superclasses, i.e:
Integer.class;
Number.class;
You can read more about the differences here: The difference between Classes, Objects, and Instances
answered Mar 25 at 21:33
Pavel SmirnovPavel Smirnov
2,7692 gold badges9 silver badges18 bronze badges
add a comment |
The first list contains objects of Integer and its superclasses.
The second one contains class objects (or simply classes) of Integer and its superclasses, i.e:
Integer.class;
Number.class;
You can read more about the differences here: The difference between Classes, Objects, and Instances
answered Mar 25 at 21:33
Pavel SmirnovPavel Smirnov
2,7692 gold badges9 silver badges18 bronze badges
The first list contains objects of Integer and its superclasses.
The second one contains class objects (or simply classes) of Integer and its superclasses, i.e:
Integer.class;
Number.class;
You can read more about the differences here: The difference between Classes, Objects, and Instances
answered Mar 25 at 21:33
Pavel SmirnovPavel Smirnov
2,7692 gold badges9 silver badges18 bronze badges
edited Mar 25 at 21:56
answered Mar 25 at 21:33
Pavel SmirnovPavel Smirnov
2,7692 gold badges9 silver badges18 bronze badges
answered Mar 25 at 21:33
Pavel SmirnovPavel Smirnov
2,7692 gold badges9 silver badges18 bronze badges
answered Mar 25 at 21:33
Pavel SmirnovPavel Smirnov
2,7692 gold badges9 silver badges18 bronze badges
2,7692 gold badges9 silver badges18 bronze badges
add a comment |
add a comment |
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myList2.add(Integer.class);– Ruslan
Mar 25 at 21:32
Possible duplicate of What is a difference between <? super E> and <? extends E>?
– LppEdd
Mar 25 at 21:32
2
myListis a list of object instances, e.g. aList<Number>storingInteger,Double,BigDecimal, ... objects, such as42,3.14159,3e9876, ... ---myList2is a list ofClassobjects, i.e. a list ofInteger.class,Number.class,Object.class,Serializable.class, orComparable.classvalues.– Andreas
Mar 25 at 21:33
I understand the difference between super and extends. I was just wondering where myList2 would be used.
– AsadSMalik
Mar 25 at 21:33
1
I can't offhand think of a use for a list of class objects, but in general you use a Class object as a way to indicate type, or as a way to determine the properties of that type.
– another-dave
Mar 25 at 21:53