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how can we implement methods in multiples classes if we add methods in interface
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In an interview interviewer asked this question. In an Interface1 there are 10 methods and implementing that Interface1 there are 1000 classes. Later in Interface1 I have added 11th method. How can you implement that 11th method in all classes. later he asked how can you implement in only few classes. Because of 1000 classes you cannot just go to each class and implement, its time taking. Can you tell me how to solve.
java
asked Apr 8 at 11:58
rohanrohan
432
add a comment |
In an interview interviewer asked this question. In an Interface1 there are 10 methods and implementing that Interface1 there are 1000 classes. Later in Interface1 I have added 11th method. How can you implement that 11th method in all classes. later he asked how can you implement in only few classes. Because of 1000 classes you cannot just go to each class and implement, its time taking. Can you tell me how to solve.
java
asked Apr 8 at 11:58
rohanrohan
432
for all classes: make it a default method. "only few classes", you can't. what's in an interface goes for all the implementations
– Stultuske
Apr 8 at 12:00
4
Use an abstract class that implements the method, let your classes extend this abstract class.
– Lutz Horn
Apr 8 at 12:01
If your classes use inheritance, you could update it in the base classes.
– Patrick
Apr 8 at 12:02
Probably, you need an abstract class?
– dehasi
Apr 8 at 12:30
Step 1. Refactor so you don't have 1,000 classes
– John Wu
Apr 8 at 16:29
add a comment |
In an interview interviewer asked this question. In an Interface1 there are 10 methods and implementing that Interface1 there are 1000 classes. Later in Interface1 I have added 11th method. How can you implement that 11th method in all classes. later he asked how can you implement in only few classes. Because of 1000 classes you cannot just go to each class and implement, its time taking. Can you tell me how to solve.
java
asked Apr 8 at 11:58
rohanrohan
432
In an interview interviewer asked this question. In an Interface1 there are 10 methods and implementing that Interface1 there are 1000 classes. Later in Interface1 I have added 11th method. How can you implement that 11th method in all classes. later he asked how can you implement in only few classes. Because of 1000 classes you cannot just go to each class and implement, its time taking. Can you tell me how to solve.
java
java
asked Apr 8 at 11:58
rohanrohan
432
asked Apr 8 at 11:58
rohanrohan
432
asked Apr 8 at 11:58
rohanrohan
432
asked Apr 8 at 11:58
rohanrohan
432
asked Apr 8 at 11:58
rohanrohan
432
432
for all classes: make it a default method. "only few classes", you can't. what's in an interface goes for all the implementations
– Stultuske
Apr 8 at 12:00
4
Use an abstract class that implements the method, let your classes extend this abstract class.
– Lutz Horn
Apr 8 at 12:01
If your classes use inheritance, you could update it in the base classes.
– Patrick
Apr 8 at 12:02
Probably, you need an abstract class?
– dehasi
Apr 8 at 12:30
Step 1. Refactor so you don't have 1,000 classes
– John Wu
Apr 8 at 16:29
add a comment |
for all classes: make it a default method. "only few classes", you can't. what's in an interface goes for all the implementations
– Stultuske
Apr 8 at 12:00
4
Use an abstract class that implements the method, let your classes extend this abstract class.
– Lutz Horn
Apr 8 at 12:01
If your classes use inheritance, you could update it in the base classes.
– Patrick
Apr 8 at 12:02
Probably, you need an abstract class?
– dehasi
Apr 8 at 12:30
Step 1. Refactor so you don't have 1,000 classes
– John Wu
Apr 8 at 16:29
for all classes: make it a default method. "only few classes", you can't. what's in an interface goes for all the implementations
– Stultuske
Apr 8 at 12:00
for all classes: make it a default method. "only few classes", you can't. what's in an interface goes for all the implementations
– Stultuske
Apr 8 at 12:00
4
4
Use an abstract class that implements the method, let your classes extend this abstract class.
– Lutz Horn
Apr 8 at 12:01
Use an abstract class that implements the method, let your classes extend this abstract class.
– Lutz Horn
Apr 8 at 12:01
If your classes use inheritance, you could update it in the base classes.
– Patrick
Apr 8 at 12:02
If your classes use inheritance, you could update it in the base classes.
– Patrick
Apr 8 at 12:02
Probably, you need an abstract class?
– dehasi
Apr 8 at 12:30
Probably, you need an abstract class?
– dehasi
Apr 8 at 12:30
Step 1. Refactor so you don't have 1,000 classes
– John Wu
Apr 8 at 16:29
Step 1. Refactor so you don't have 1,000 classes
– John Wu
Apr 8 at 16:29
add a comment |
2 Answers
2
active
oldest
votes
He was likely hinting at default methods in interfaces (available only from java 8).
E.g:
interface MyInterface
default void method()
// do stuff...
All classes implementing the interface will inherit the method, you can yet override it in case you need specific behavior.
class MyClass implements MyInterface
@Override
public void method()
// do stuff...
Also, you can leave the base method blank (that does nothing) and then override it in your 11 classes. Or you can have another interface (e.g: SubInterface) extend MyInterface, override the base method and have your 11 classes implement directly the SubInterface so they inherit the most specific behavior. There are countless possibilities for what you have asked (including abstract classes, as someone mentioned in the comments).
answered Apr 8 at 12:02
Marko PacakMarko Pacak
2,4991529
add a comment |
if you have to use previous versions of Java, you could simply used abstract classes,it is one such way to implement the above scenario.
answered Apr 10 at 8:34
Syed Zubair AhamedSyed Zubair Ahamed
11
New contributor
Syed Zubair Ahamed is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
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active
oldest
votes
He was likely hinting at default methods in interfaces (available only from java 8).
E.g:
interface MyInterface
default void method()
// do stuff...
All classes implementing the interface will inherit the method, you can yet override it in case you need specific behavior.
class MyClass implements MyInterface
@Override
public void method()
// do stuff...
Also, you can leave the base method blank (that does nothing) and then override it in your 11 classes. Or you can have another interface (e.g: SubInterface) extend MyInterface, override the base method and have your 11 classes implement directly the SubInterface so they inherit the most specific behavior. There are countless possibilities for what you have asked (including abstract classes, as someone mentioned in the comments).
answered Apr 8 at 12:02
Marko PacakMarko Pacak
2,4991529
add a comment |
He was likely hinting at default methods in interfaces (available only from java 8).
E.g:
interface MyInterface
default void method()
// do stuff...
All classes implementing the interface will inherit the method, you can yet override it in case you need specific behavior.
class MyClass implements MyInterface
@Override
public void method()
// do stuff...
Also, you can leave the base method blank (that does nothing) and then override it in your 11 classes. Or you can have another interface (e.g: SubInterface) extend MyInterface, override the base method and have your 11 classes implement directly the SubInterface so they inherit the most specific behavior. There are countless possibilities for what you have asked (including abstract classes, as someone mentioned in the comments).
answered Apr 8 at 12:02
Marko PacakMarko Pacak
2,4991529
add a comment |
He was likely hinting at default methods in interfaces (available only from java 8).
E.g:
interface MyInterface
default void method()
// do stuff...
All classes implementing the interface will inherit the method, you can yet override it in case you need specific behavior.
class MyClass implements MyInterface
@Override
public void method()
// do stuff...
Also, you can leave the base method blank (that does nothing) and then override it in your 11 classes. Or you can have another interface (e.g: SubInterface) extend MyInterface, override the base method and have your 11 classes implement directly the SubInterface so they inherit the most specific behavior. There are countless possibilities for what you have asked (including abstract classes, as someone mentioned in the comments).
answered Apr 8 at 12:02
Marko PacakMarko Pacak
2,4991529
He was likely hinting at default methods in interfaces (available only from java 8).
E.g:
interface MyInterface
default void method()
// do stuff...
All classes implementing the interface will inherit the method, you can yet override it in case you need specific behavior.
class MyClass implements MyInterface
@Override
public void method()
// do stuff...
Also, you can leave the base method blank (that does nothing) and then override it in your 11 classes. Or you can have another interface (e.g: SubInterface) extend MyInterface, override the base method and have your 11 classes implement directly the SubInterface so they inherit the most specific behavior. There are countless possibilities for what you have asked (including abstract classes, as someone mentioned in the comments).
answered Apr 8 at 12:02
Marko PacakMarko Pacak
2,4991529
edited Apr 8 at 12:29
answered Apr 8 at 12:02
Marko PacakMarko Pacak
2,4991529
answered Apr 8 at 12:02
Marko PacakMarko Pacak
2,4991529
answered Apr 8 at 12:02
Marko PacakMarko Pacak
2,4991529
2,4991529
add a comment |
add a comment |
if you have to use previous versions of Java, you could simply used abstract classes,it is one such way to implement the above scenario.
answered Apr 10 at 8:34
Syed Zubair AhamedSyed Zubair Ahamed
11
New contributor
Syed Zubair Ahamed is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
if you have to use previous versions of Java, you could simply used abstract classes,it is one such way to implement the above scenario.
answered Apr 10 at 8:34
Syed Zubair AhamedSyed Zubair Ahamed
11
New contributor
Syed Zubair Ahamed is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
if you have to use previous versions of Java, you could simply used abstract classes,it is one such way to implement the above scenario.
answered Apr 10 at 8:34
Syed Zubair AhamedSyed Zubair Ahamed
11
New contributor
Syed Zubair Ahamed is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
if you have to use previous versions of Java, you could simply used abstract classes,it is one such way to implement the above scenario.
answered Apr 10 at 8:34
Syed Zubair AhamedSyed Zubair Ahamed
11
New contributor
Syed Zubair Ahamed is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered Apr 10 at 8:34
Syed Zubair AhamedSyed Zubair Ahamed
11
New contributor
Syed Zubair Ahamed is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered Apr 10 at 8:34
Syed Zubair AhamedSyed Zubair Ahamed
11
answered Apr 10 at 8:34
Syed Zubair AhamedSyed Zubair Ahamed
11
11
New contributor
Syed Zubair Ahamed is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Syed Zubair Ahamed is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Syed Zubair Ahamed is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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for all classes: make it a default method. "only few classes", you can't. what's in an interface goes for all the implementations
– Stultuske
Apr 8 at 12:00
4
Use an abstract class that implements the method, let your classes extend this abstract class.
– Lutz Horn
Apr 8 at 12:01
If your classes use inheritance, you could update it in the base classes.
– Patrick
Apr 8 at 12:02
Probably, you need an abstract class?
– dehasi
Apr 8 at 12:30
Step 1. Refactor so you don't have 1,000 classes
– John Wu
Apr 8 at 16:29