Java Tutorials | Test Your JAVA Skills | Challenge - 1 | by DURGA Sir

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[ravurisandeep]

In code1 : change either class keyword to Interface or add abstarct kW to both method and class or provide method body

[v.bhavana]

yes, 1st question is valid if you will only consider the logic
yes, 3rd one is valid
4th one is may be compiler error because abstract classes contain methods that defaultly abstract we dont want to again initialize method as abstract

1. compile time error because method body not declared
2.compile time error because abstract metod does not have a body
3.C.E BECAUSE PARENT IS NOT ABSTRACT.
4.COMPILE SUCCESFULLY.

[sujeetarya]

1:-invalid method should have body
2:-invalid abstract method can't have body
3:-vaild
4:-missed while writing answers
5:- invalid all method should be overridden
6:-all methods should be overridden in child class

[swarupsarkar]

Coding Snippet 4 is valid because as the class is having one abstract method the class should be abstract and here the class is abstract and hence acceptable.

[getwaystar]

1)missing method body or declared class as abstract.
2)abstract method cann't have a body.
3)class should declared as abstract.
4)valid.
5)valid.
6)subchild class should be declared as abstract.

[balsaviclasses]

4th one valid because a abstract class contain a abstract method declaration without any problem

[badshahduwan]

Coding snipeer-1
Ans:- Invalid
Reason;-CE:-missing method body or declare abstract

[TeluguTravelDiaries]

1)ans: we should declare method and class as a abstarct otherwise we should provide body for method m1()
2)Invalid: a)abstarct method doesn't contains body
b)remove body and declare class also abstract

3)Invalid: we should declare class as abstract otherwise we provide body for m1()

4)Valid

5)Invalid: we should override m2 method else we should declare subclass also as abstarct

6)Invalid : We should override m2() method in child class or Subchild class otherwise we should declare Subchild class as abstract

[rkrohit]

1, 2, 3 invalid : Class must be abstract if any one method is abstract
4: valid
5: invalid, if child extends abstract, child must have to override all abstract method, or make child abstract.
6: valid.

[tanujroy]

Good Evening Sir ji.
1. Compile time error.
Missing method body.
2. Compile time error.
Abstract methods cannot have a body
3. Compile time error.
Parent is not abstract and does not override abstract method m1( ) in Parent class Parent
4. Valid
5. Compile time error.
Child is not abstract and does not override abstract method m2( ) in Parent class child extends parent.

[themrambusher]

please provide the link to the video that contains answers of these questions

[deepkumar]

Snippet Six we are getting any compile-time error because we know that if the Parent class is abstract and the child is also abstract then the Child class may or may not provide the implementation but if we are creating the Sub child class of the child class then the Sub child has compulsory provide the implementation for all the method that is present in the parent class

[deepkumar]

Snippet third is also the invalid because the abstract class can contain the abstract method
but the class parent is the non abstract so that why we are getting the compile-time error in that case

[vipijithn]

1 valid
2 invalid
abstract method not have a body
3 invalid
: if a class have a abstract method, the class must be abstract
4 valid
:class is abstract and it have abstract method not having a body
5 invalid
: extend a abstract method .. the parent class must be implement all the abstract methods
6 invalid

[deepkumar]

Snippet four is the valid we are not getting any compile time error in the case

[gandheshiva]

coding snippet-1 the method in this class has no implementation so it should be declared as abstract. If we declare m1() as abstract the class should be declared as abstract.

coding snippet-2 if a class contains atleast one abstract method, the class should be declared as abstract.

coding snippet-3 if a class contains atleast one abstract method the class should be declared as abstract.

coding snippet-4 correct both the class and method declared as abstract.

coding snippet-5 if a class extends abstract class all the methods present in the abstract class should be implemented in the extending class.

coding snippet-6 as base class is declared as abstract whatever the abstract methods present in the root class should implemented in the subbase class.

[rrhegde]

1.Invalid.
because class is not abstract or method does not have implimentation.
2.Invalid.
because abstract method dont have implimentation block should be end with semicolon.
3.invalid.
because if method is abstract class must be abstract class or interface
4.Valid
5. Invalid
because child class not implimented both the parent class method or not declered as abstract class
6. Invalid .
Because Abstract method m2() not implimented in its child classes or subchild class not declared as abstract.

[deepkumar]

Coding Snippet 1 is invalid
because we declare the method m1() but we do not provide any implementation to the method m1() but the method m1 is not abstract we know that the method is declared only when the method is abstract so that's why this method is the invalid
valid code of this example is
class Parent{
abstract public void m1();
}
now this code is valid

[tiktokrockstar]

sir first is invalid because of this method not mention abstract if method is abstract then class is also abstract