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how can we implement methods in multiples classes if we add methods in interface
The 2019 Stack Overflow Developer Survey Results Are InHow to unit test abstract classes: extend with stubs?Fastest way to determine if an integer's square root is an integerWhy can't I define a static method in a Java interface?How can I create an executable JAR with dependencies using Maven?Efficiency of Java “Double Brace Initialization”?How do servlets work? Instantiation, sessions, shared variables and multithreadingWhy can I throw null in Java?Ways to iterate over a list in JavaHow should I have explained the difference between an Interface and an Abstract class?Why is “final” not allowed in Java 8 interface methods?
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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 2 days ago
rohanrohan
372
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 2 days ago
rohanrohan
372
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
2 days ago
4
Use an abstract class that implements the method, let your classes extend this abstract class.
– Lutz Horn
2 days ago
If your classes use inheritance, you could update it in the base classes.
– Patrick
2 days ago
Probably, you need an abstract class?
– dehasi
2 days ago
Step 1. Refactor so you don't have 1,000 classes
– John Wu
2 days ago
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 2 days ago
rohanrohan
372
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 2 days ago
rohanrohan
372
asked 2 days ago
rohanrohan
372
asked 2 days ago
rohanrohan
372
asked 2 days ago
rohanrohan
372
asked 2 days ago
rohanrohan
372
372
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
2 days ago
4
Use an abstract class that implements the method, let your classes extend this abstract class.
– Lutz Horn
2 days ago
If your classes use inheritance, you could update it in the base classes.
– Patrick
2 days ago
Probably, you need an abstract class?
– dehasi
2 days ago
Step 1. Refactor so you don't have 1,000 classes
– John Wu
2 days ago
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
2 days ago
4
Use an abstract class that implements the method, let your classes extend this abstract class.
– Lutz Horn
2 days ago
If your classes use inheritance, you could update it in the base classes.
– Patrick
2 days ago
Probably, you need an abstract class?
– dehasi
2 days ago
Step 1. Refactor so you don't have 1,000 classes
– John Wu
2 days ago
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
2 days ago
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
2 days ago
4
4
Use an abstract class that implements the method, let your classes extend this abstract class.
– Lutz Horn
2 days ago
Use an abstract class that implements the method, let your classes extend this abstract class.
– Lutz Horn
2 days ago
If your classes use inheritance, you could update it in the base classes.
– Patrick
2 days ago
If your classes use inheritance, you could update it in the base classes.
– Patrick
2 days ago
Probably, you need an abstract class?
– dehasi
2 days ago
Probably, you need an abstract class?
– dehasi
2 days ago
Step 1. Refactor so you don't have 1,000 classes
– John Wu
2 days ago
Step 1. Refactor so you don't have 1,000 classes
– John Wu
2 days ago
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 2 days ago
Marko PacakMarko Pacak
2,4891529
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 19 hours ago
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
votes
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 2 days ago
Marko PacakMarko Pacak
2,4891529
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 2 days ago
Marko PacakMarko Pacak
2,4891529
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 2 days ago
Marko PacakMarko Pacak
2,4891529
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 2 days ago
Marko PacakMarko Pacak
2,4891529
edited 2 days ago
answered 2 days ago
Marko PacakMarko Pacak
2,4891529
answered 2 days ago
Marko PacakMarko Pacak
2,4891529
answered 2 days ago
Marko PacakMarko Pacak
2,4891529
2,4891529
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 19 hours ago
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 19 hours ago
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 19 hours ago
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 19 hours ago
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 19 hours ago
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 19 hours ago
Syed Zubair AhamedSyed Zubair Ahamed
11
answered 19 hours ago
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
2 days ago
4
Use an abstract class that implements the method, let your classes extend this abstract class.
– Lutz Horn
2 days ago
If your classes use inheritance, you could update it in the base classes.
– Patrick
2 days ago
Probably, you need an abstract class?
– dehasi
2 days ago
Step 1. Refactor so you don't have 1,000 classes
– John Wu
2 days ago