How Java 8 has concrete methods in Collection Interface? [duplicate]
This question already has an answer here:
What is the “default” implementation of method defined in an Interface?
3 answers
What is the purpose of a static method in interface from Java 8?
2 answers
I was referring to the Collection Interface of Java 8, where I saw that Collection method has concrete method public boolean removeIf(Predicate paramPredicate) , but as per the definition of Interface we can only have static and default method with body and rest can be abstract.
I tried creating the concrete method in an Interface and received compile time error Abstract methods do not specify a body with 3 quick fixes from eclipse:
- Change method to default
- Change method to static
- Remove method body
Can anyone explain how Collection interface has concrete implementation of methods removeIf , spliterator , stream , parallelStream ?
java collections interface java-8
asked Nov 14 '18 at 8:14
Prakash VkPrakash Vk
215
marked as duplicate by ernest_k java
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Nov 14 '18 at 8:17
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
This question already has an answer here:
What is the “default” implementation of method defined in an Interface?
3 answers
What is the purpose of a static method in interface from Java 8?
2 answers
I was referring to the Collection Interface of Java 8, where I saw that Collection method has concrete method public boolean removeIf(Predicate paramPredicate) , but as per the definition of Interface we can only have static and default method with body and rest can be abstract.
I tried creating the concrete method in an Interface and received compile time error Abstract methods do not specify a body with 3 quick fixes from eclipse:
- Change method to default
- Change method to static
- Remove method body
Can anyone explain how Collection interface has concrete implementation of methods removeIf , spliterator , stream , parallelStream ?
java collections interface java-8
asked Nov 14 '18 at 8:14
Prakash VkPrakash Vk
215
marked as duplicate by ernest_k java
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Nov 14 '18 at 8:17
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
2
It's adefaultmethod :default boolean removeIf(Predicate<? super E> filter)
– Eran
Nov 14 '18 at 8:16
Default Methods in interfaces is a new feature of Java 8...
– Nirekin
Nov 14 '18 at 8:16
4
@Nirekin that "new" feature will turn 5 years very soon
– Eugene
Nov 14 '18 at 8:17
2
@Eugene ... and Java 8 itself is end of public updates in Jan '19. ;)
– Peter Lawrey
Nov 14 '18 at 8:18
My decompiler is showing it as public, got it verified from official site docs.oracle.com/javase/8/docs/api/java/util/Collection.html it is default method. :p
– Prakash Vk
Nov 14 '18 at 8:30
add a comment |
This question already has an answer here:
What is the “default” implementation of method defined in an Interface?
3 answers
What is the purpose of a static method in interface from Java 8?
2 answers
I was referring to the Collection Interface of Java 8, where I saw that Collection method has concrete method public boolean removeIf(Predicate paramPredicate) , but as per the definition of Interface we can only have static and default method with body and rest can be abstract.
I tried creating the concrete method in an Interface and received compile time error Abstract methods do not specify a body with 3 quick fixes from eclipse:
- Change method to default
- Change method to static
- Remove method body
Can anyone explain how Collection interface has concrete implementation of methods removeIf , spliterator , stream , parallelStream ?
java collections interface java-8
asked Nov 14 '18 at 8:14
Prakash VkPrakash Vk
215
This question already has an answer here:
What is the “default” implementation of method defined in an Interface?
3 answers
What is the purpose of a static method in interface from Java 8?
2 answers
I was referring to the Collection Interface of Java 8, where I saw that Collection method has concrete method public boolean removeIf(Predicate paramPredicate) , but as per the definition of Interface we can only have static and default method with body and rest can be abstract.
I tried creating the concrete method in an Interface and received compile time error Abstract methods do not specify a body with 3 quick fixes from eclipse:
- Change method to default
- Change method to static
- Remove method body
Can anyone explain how Collection interface has concrete implementation of methods removeIf , spliterator , stream , parallelStream ?
This question already has an answer here:
What is the “default” implementation of method defined in an Interface?
3 answers
What is the purpose of a static method in interface from Java 8?
2 answers
java collections interface java-8
java collections interface java-8
asked Nov 14 '18 at 8:14
Prakash VkPrakash Vk
215
asked Nov 14 '18 at 8:14
Prakash VkPrakash Vk
215
edited Nov 14 '18 at 8:25
Prakash Vk
asked Nov 14 '18 at 8:14
Prakash VkPrakash Vk
215
asked Nov 14 '18 at 8:14
Prakash VkPrakash Vk
215
asked Nov 14 '18 at 8:14
Prakash VkPrakash Vk
215
215
marked as duplicate by ernest_k java
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Nov 14 '18 at 8:17
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
marked as duplicate by ernest_k java
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Nov 14 '18 at 8:17
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
2
It's adefaultmethod :default boolean removeIf(Predicate<? super E> filter)
– Eran
Nov 14 '18 at 8:16
Default Methods in interfaces is a new feature of Java 8...
– Nirekin
Nov 14 '18 at 8:16
4
@Nirekin that "new" feature will turn 5 years very soon
– Eugene
Nov 14 '18 at 8:17
2
@Eugene ... and Java 8 itself is end of public updates in Jan '19. ;)
– Peter Lawrey
Nov 14 '18 at 8:18
My decompiler is showing it as public, got it verified from official site docs.oracle.com/javase/8/docs/api/java/util/Collection.html it is default method. :p
– Prakash Vk
Nov 14 '18 at 8:30
add a comment |
2
It's adefaultmethod :default boolean removeIf(Predicate<? super E> filter)
– Eran
Nov 14 '18 at 8:16
Default Methods in interfaces is a new feature of Java 8...
– Nirekin
Nov 14 '18 at 8:16
4
@Nirekin that "new" feature will turn 5 years very soon
– Eugene
Nov 14 '18 at 8:17
2
@Eugene ... and Java 8 itself is end of public updates in Jan '19. ;)
– Peter Lawrey
Nov 14 '18 at 8:18
My decompiler is showing it as public, got it verified from official site docs.oracle.com/javase/8/docs/api/java/util/Collection.html it is default method. :p
– Prakash Vk
Nov 14 '18 at 8:30
2
2
It's a
default method : default boolean removeIf(Predicate<? super E> filter)– Eran
Nov 14 '18 at 8:16
It's a
default method : default boolean removeIf(Predicate<? super E> filter)– Eran
Nov 14 '18 at 8:16
Default Methods in interfaces is a new feature of Java 8...
– Nirekin
Nov 14 '18 at 8:16
Default Methods in interfaces is a new feature of Java 8...
– Nirekin
Nov 14 '18 at 8:16
4
4
@Nirekin that "new" feature will turn 5 years very soon
– Eugene
Nov 14 '18 at 8:17
@Nirekin that "new" feature will turn 5 years very soon
– Eugene
Nov 14 '18 at 8:17
2
2
@Eugene ... and Java 8 itself is end of public updates in Jan '19. ;)
– Peter Lawrey
Nov 14 '18 at 8:18
@Eugene ... and Java 8 itself is end of public updates in Jan '19. ;)
– Peter Lawrey
Nov 14 '18 at 8:18
My decompiler is showing it as public, got it verified from official site docs.oracle.com/javase/8/docs/api/java/util/Collection.html it is default method. :p
– Prakash Vk
Nov 14 '18 at 8:30
My decompiler is showing it as public, got it verified from official site docs.oracle.com/javase/8/docs/api/java/util/Collection.html it is default method. :p
– Prakash Vk
Nov 14 '18 at 8:30
add a comment |
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2
It's a
defaultmethod :default boolean removeIf(Predicate<? super E> filter)– Eran
Nov 14 '18 at 8:16
Default Methods in interfaces is a new feature of Java 8...
– Nirekin
Nov 14 '18 at 8:16
4
@Nirekin that "new" feature will turn 5 years very soon
– Eugene
Nov 14 '18 at 8:17
2
@Eugene ... and Java 8 itself is end of public updates in Jan '19. ;)
– Peter Lawrey
Nov 14 '18 at 8:18
My decompiler is showing it as public, got it verified from official site docs.oracle.com/javase/8/docs/api/java/util/Collection.html it is default method. :p
– Prakash Vk
Nov 14 '18 at 8:30