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Yes. You cannot inherit a final class but very well instantiate a final class
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∙ 12y ago
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What is class variable?
Class Variables or Instances variables are variables that are declared inside a class and are available for the whole class. They are available for all instances of that class and are not specific to any method. Ex: public class Test { private String name = "Rocky"; } Here name is a class variable.
How you declare class scoped variables and member functions?
To scope class members to the class (rather than to instances of the class), declare them as static members of the class. Static members are accessible even when no instances of the class exist. As such, static member functions do not have access to a 'this' pointer, unlike ordinary (nonstatic) member functions.
Discuss final method and final classes?
a method declared final can not be overridden, and a class declared as final can not be extended by its sub class.
Difference between abstract and final class?
Abstract class is built to promote inheritance whereas a final class is built to avoid inheritanceAn Abstract class can be extended by another class whereas a final class cannot be extended
Final classes in java?
A class declared as final means that no other class can inherit from it.
How do you define a class that will take maximum 5 objects of that to be created?
/** * Class that allows a maximum of 5 instances to be created */ public final class MaxFive { private static int count = 0; private MaxFive() { } /** * Get an available instance (not thread-safe) * @return MaxFive a new instance (max of 5 instances) * @throws Exception if no new instances can be created */ public static MaxFive getInstance() throws Exception { if (count < 5) { count++; return new MaxFive(); } throw new Exception("Too many instances"); } }
What is the purpose of a class attribute?
A class attribute is a variable that is shared by all instances of the class. It is used to store data that is common to all instances of the class, rather than specific to each instance. This can help avoid redundancy and ensure consistency across all instances.
Is String are instances of the class string?
yes
How do you prevent class extending in java?
Declare the class as final. final class A{ ... }
When do you declare a class as final?
By using the final keyword in the class declaration statement. Ex: public final class Test {...}
What is class variable?
Class Variables or Instances variables are variables that are declared inside a class and are available for the whole class. They are available for all instances of that class and are not specific to any method. Ex: public class Test { private String name = "Rocky"; } Here name is a class variable.
How you declare class scoped variables and member functions?
To scope class members to the class (rather than to instances of the class), declare them as static members of the class. Static members are accessible even when no instances of the class exist. As such, static member functions do not have access to a 'this' pointer, unlike ordinary (nonstatic) member functions.
Discuss final method and final classes?
a method declared final can not be overridden, and a class declared as final can not be extended by its sub class.
Why would you make a class final in java?
You would make a class Final in Java if you do not want anybody to inherit the features of your class. If you declare a class as Final, then no other class can extend this class. Example: public final class X { .... } public class Y extends X { .... } Here Y cannot extend X because X is final and this code would not work.
How can you create a class which cannot be inheritable?
Declare it final.
What are final class?
class is identifier
Difference between abstract and final class?
Abstract class is built to promote inheritance whereas a final class is built to avoid inheritanceAn Abstract class can be extended by another class whereas a final class cannot be extended
