java Interview Questions| Java @ IDN Knowledge Xchange (KEP)

S.No	Question	Posted By	Date	Answers	Views
S.No	Question	Posted By	Date	Answers	Views
1	Can the Interface be final?	ROHAN	Apr 30, 2021 10:20	1	57
2	Can there be an abstract method without an abstract class?	ROHAN	Apr 27, 2021 10:46	1	31
3	Can we change the scope of the overridden method in the subclass?	RANJIT	Mar 11, 2021 11:44	1	49
4	Can we declare a constructor as final?	RANJIT	Apr 08, 2021 12:56	2	46
5	Can we declare an interface as final?	JOSHUA	Apr 08, 2021 12:57	0	43
6	Can we declare the static variables and methods in an abstract class?	SANJAY	Feb 20, 2021 10:05	1	54
7	Can we execute a program without main() method?	RANJIT	Mar 08, 2021 12:39	1	51
8	Can we make constructors static?	JOSHUA	Feb 20, 2021 09:56	1	58
9	Can we make the abstract methods static in Java?	VAMSI	Feb 20, 2021 10:02	1	59
10	Can we modify the throws clause of the superclass method while overriding it in the subclass?	VAMSI	Mar 12, 2021 11:15	1	75
11	Can we overload the constructors?	SANJAY	Feb 15, 2021 10:59	1	51
12	Can we overload the main() method?	ROHAN	Mar 03, 2021 10:58	1	49
13	Can we override the overloaded method?	ROHAN	Mar 11, 2021 11:41	1	53
14	Can we override the private methods?	VAMSI	Mar 11, 2021 11:43	1	49
15	Can we override the static method?	RANJIT	Mar 06, 2021 10:16	1	48
16	Can we override the static methods?	RANJIT	Feb 19, 2021 11:05	1	51
17	Can you achieve Runtime Polymorphism by data members?	RANJIT	Apr 20, 2021 12:53	1	28
18	Can you declare an interface method static?	VAMSI	Apr 28, 2021 10:14	1	26
19	Can you declare the main method as final?	JOSHUA	Apr 06, 2021 12:49	1	48
20	Can you have virtual functions in Java?	VAMSI	Mar 30, 2021 12:14	1	44
21	Can you make a constructor final?	VAMSI	Feb 15, 2021 10:54	1	51
22	Can you use abstract and final both with a method?	SANJAY	Apr 27, 2021 10:47	1	37
23	do we have DESTRUCTORS in Java? have never seen an example of a destructor program, only constructor?	RANJIT	Mar 29, 2021 12:22	1	51
24	Does constructor return any value?	JOSHUA	Feb 13, 2021 10:40	1	49
25	For Instance, a Hotel management system can be termed as a software, an app, and also an Information system. Why so many names for just one thing? The concept of a software, and an Information system, there's no difference here, just the names?	JOSHUA	Apr 20, 2021 12:55	1	37
26	How can we access some class in another class in Java?	VAMSI	May 29, 2021 09:32	1	17
27	How many types of constructors are used in Java?	SANJAY	Feb 13, 2021 10:35	1	53
28	How many types of memory areas are allocated by JVM?	SANJAY	Feb 03, 2021 09:40	1	60
29	How to add Bootstrap to Angular 10?	RANJIT	Mar 09, 2021 11:15	1	60
30	How to make a read-only class in Java?	KRISHNA SWAROOP	May 03, 2021 09:58	1	40
31	How to make a write-only class in Java?	PADMAKEECHU	May 04, 2021 13:11	0	38
32	how we can take list from user?	RANJIT	Apr 23, 2021 11:16	1	35
33	I want to upload a large file for my application. but I'm getting a java heap space error. I use optional when getting the file in my application code. How can I add this file by dividing or shredding it?	RANJIT	Apr 07, 2021 11:50	1	33
34	If I don't provide any arguments on the command line, then what will the value stored in the String array passed into the main() method, empty or NULL?	JOSHUA	Feb 08, 2021 08:50	1	67
35	Is constructor inherited?	RANJIT	Feb 15, 2021 10:50	1	54
36	Is delete, next, main, exit or null keyword in java?	SANJAY	Feb 06, 2021 08:38	1	76
37	Is Empty .java file name a valid source file name?	VAMSI	Feb 06, 2021 08:31	1	59
38	Is it possible to instantiate the abstract class?	RANJIT	Apr 28, 2021 10:11	1	21
39	List the features of Java Programming language.	RANJIT	Feb 04, 2021 09:37	1	57
40	One of my s3 is bucket is deleted but i need to restore is there any possible way?	ALLINO	Mar 06, 2021 12:02	0	62
41	RanjitWhat is the output of the following Java program? 1. class Test 2. { 3. int i; 4. } 5. public class Main 6. { 7. public static void main (String args[]) 8. { 9. Test test = new Test(); 10. System.ou	RANJIT	Feb 17, 2021 12:34	1	47
42	What are the advantages of Encapsulation in Java?	FRAUSKY	May 04, 2021 13:15	0	36
43	What are the advantages of Packages in Java?	RANJIT	Feb 10, 2021 08:27	1	50
44	What are the advantages of passing this into a method instead of the current class object itself?	RANJIT	Feb 24, 2021 11:36	1	48
45	What are the differences between this and super keyword?	SANJAY	Mar 02, 2021 10:40	1	78
46	What are the main differences between the Java platform and other platforms?	SANJAY	Feb 04, 2021 10:00	1	63
47	What are the main uses of the super keyword?	VAMSI	Mar 02, 2021 10:38	1	53
48	What are the main uses of this keyword?	JOSHUA	Feb 24, 2021 11:35	1	47
49	What are the most important features of Java?	GANESH MALLA	Jan 23, 2021 09:46	1	66
50	What are the restrictions that are applied to the Java static methods?	JOSHUA	Feb 18, 2021 12:06	1	46
51	What are the various access specifiers in Java?	VAMSI	Feb 09, 2021 11:12	1	52
52	What do you understand by copy constructor in Java?	RANJIT	Feb 16, 2021 11:23	1	48
53	What do you understand by Java virtual machine?	JOSHUA	Feb 03, 2021 09:22	2	73
54	What gives Java its 'write once and run anywhere' nature?	RANJIT	Feb 06, 2021 08:22	1	58
55	What if I write static public void instead of public static void?	RANJIT	Feb 08, 2021 08:52	1	56
56	What if the static modifier is removed from the signature of the main method?	ROHAN	Feb 20, 2021 09:55	1	44
57	What if the static modifier is removed from the signature of the main method?	VAMSI	Mar 08, 2021 12:41	1	53
58	what is a 'translation look-aside buffer'?	JOSHUA	Apr 23, 2021 11:13	1	39
59	What is a marker interface?	SANJAY	Apr 30, 2021 10:21	1	41
60	What is a virtual file system? Give an example.	SANJAY	Apr 19, 2021 12:18	1	29
61	What is aggregation?	RANJIT	Feb 26, 2021 10:21	1	63
62	What is an object?	VAMSI	Feb 11, 2021 11:44	1	51
63	What is classloader?	JOSHUA	Feb 06, 2021 08:26	1	61
64	What is composition?	SANJAY	Feb 27, 2021 10:19	1	49
65	What is Exception Handling?	JOSHUA	Jun 01, 2021 08:24	0	8
66	What is Java instance Of operator?	ROHAN	Apr 22, 2021 12:42	1	41
67	What is Java instanceOf operator?	ROHAN	May 29, 2021 09:17	1	16
68	What is JIT compiler?	JOSHUA	Feb 04, 2021 09:43	1	55
69	What is method overloading?	SANJAY	Mar 03, 2021 10:57	1	49
70	What is method overriding?	SANJAY	Mar 06, 2021 10:15	1	49
71	What is object cloning?	RANJIT	Mar 02, 2021 10:43	1	50
72	What is object-oriented paradigm?	RANJIT	Feb 11, 2021 11:46	1	59
73	What is Runtime Polymorphism?	RANJIT	May 27, 2021 09:23	1	14
74	What is the abstraction?	VAMSI	Apr 15, 2021 13:06	0	35
75	What is the abstraction?	SANJAY	Apr 22, 2021 12:43	1	42
76	What is the base class for Error and Exception?	ROHAN	Jun 05, 2021 13:56	0	4
77	What is the constructor?	VAMSI	Feb 12, 2021 11:07	1	58
78	What is the default value of the local variables?	SANJAY	Feb 08, 2021 08:56	1	56
79	What is the difference between abstraction and encapsulation?	JOSHUA	Apr 15, 2021 13:04	0	29
80	What is the difference between abstraction and encapsulation?	ROHAN	Apr 26, 2021 09:52	1	28
81	What is the difference between aggregation and composition?	RANJIT	Mar 01, 2021 10:55	1	46
82	What is the difference between an object-oriented programming language and object-based programming language?	RANJIT	Feb 12, 2021 11:04	1	49
83	What is the difference between JDK, JRE, and JVM?	VAMSI	Feb 03, 2021 09:37	1	60
84	What is the difference between static binding and dynamic binding?	SANJAY	Apr 21, 2021 12:30	0	50
85	What is the difference between the final method and abstract method?	SANJAY	Apr 10, 2021 12:46	1	40
86	What is the final blank variable?	VAMSI	Apr 02, 2021 13:05	1	40
87	What is the final class?	ROHAN	Apr 01, 2021 13:03	1	42
88	What is the final variable?	SANJAY	Apr 01, 2021 13:04	1	37
89	What is the Inheritance?	RANJIT	Feb 25, 2021 10:01	1	53
90	What is the interface?	JOSHUA	Apr 28, 2021 10:13	1	28
91	What is the output of the following Java program?	SANJAY	Feb 11, 2021 11:48	1	61
92	*What is the output of the following Java program? 1. class Test 2. { 3. public static void main (String args[]) 4. { 5. System.out.println(10 20 +**	SANJAY	Feb 10, 2021 08:40	1	42
93	What is the output of the following Java program? 1. class Test 2. { 3. public static void main (String args[]) 4. { 5. System.out.println(10 + 20 +	JOSHUA	Feb 10, 2021 08:25	1	52
94	What is the output of the following Java program? 1. class Main { 2. public static void main(String args[]){ 3. final int i; 4. i = 20; 5. System.out.println(i); 6. } 7. }	SANJAY	Apr 08, 2021 12:50	1	46
95	What is the output of the following Java program? 1. public class Test 2. { 3. Test(int a, int b) 4. { 5. System.out.println("a = "+a+" b = "+b); 6. } 7. Test(int a, float b) 8. { 9. System.out.println(	VAMSI	Feb 16, 2021 11:25	1	40
96	What is the platform?	VAMSI	Feb 04, 2021 09:53	1	59
97	What is the purpose of a default constructor?	VAMSI	Feb 13, 2021 10:37	1	53
98	What is the purpose of static methods and variables?	JOSHUA	Feb 09, 2021 11:17	1	48
99	What is the static block?	SANJAY	Feb 19, 2021 11:07	1	50
100	What is the static method?	VAMSI	Feb 18, 2021 12:09	1	46
101	What is the static variable?	VAMSI	Feb 17, 2021 12:36	1	44
102	What is this keyword in java?	RANJIT	Feb 23, 2021 10:58	1	46
103	*what programming language is this? r = s t x = r + 2 m = w + q**	JOSHUA	Mar 30, 2021 11:47	1	42
104	What will be the initial value of an object reference which is defined as an instance variable?	JOSHUA	Feb 12, 2021 11:05	1	50
105	When can an object reference be cast to an interface reference?	VAMSI	May 01, 2021 07:46	0	31
106	Which class is the superclass for all the classes?	SANJAY	Feb 25, 2021 10:07	1	46
107	Which is more important - learning to program or learning to debug?	VAMSI	Apr 20, 2021 12:54	1	36
108	while I use to attend web development class, the only JavaScript code our teacher used in the project was the login validation.What other things does JavaScript developers do?	VAMSI	Apr 07, 2021 11:53	1	36
109	Why can we not override static method?	VAMSI	Mar 09, 2021 11:15	1	64
110	Why do we have generic programming?	ROHAN	Apr 19, 2021 11:59	1	34
111	Why does Java not support pointers?	ROHAN	Mar 01, 2021 10:57	1	66
112	Why is BST not implemented in Java? Or any Tree based data structure.	VAMSI	Apr 12, 2021 12:27	1	32
113	Why is Inheritance used in Java?	JOSHUA	Feb 25, 2021 10:04	1	47
114	Why is multiple inheritance not supported in java?	ROHAN	Feb 26, 2021 10:16	1	44
115	Why is the main method static?	ROHAN	Feb 18, 2021 12:11	1	47

S.No

Question

Posted By

Date

Answers

Views

S.No

Question

Posted By

Date

Answers

Views

Can the Interface be final?

ROHAN

Apr 30, 2021 10:20

Can there be an abstract method without an abstract class?

ROHAN

Apr 27, 2021 10:46

Can we change the scope of the overridden method in the subclass?

RANJIT

Mar 11, 2021 11:44

Can we declare a constructor as final?

RANJIT

Apr 08, 2021 12:56

Can we declare an interface as final?

JOSHUA

Apr 08, 2021 12:57

Can we declare the static variables and methods in an abstract class?

SANJAY

Feb 20, 2021 10:05

Can we execute a program without main() method?

RANJIT

Mar 08, 2021 12:39

Can we make constructors static?

JOSHUA

Feb 20, 2021 09:56

Can we make the abstract methods static in Java?

VAMSI

Feb 20, 2021 10:02

Can we modify the throws clause of the superclass method while overriding it in the subclass?

VAMSI

Mar 12, 2021 11:15

Can we overload the constructors?

SANJAY

Feb 15, 2021 10:59

Can we overload the main() method?

ROHAN

Mar 03, 2021 10:58

Can we override the overloaded method?

ROHAN

Mar 11, 2021 11:41

Can we override the private methods?

VAMSI

Mar 11, 2021 11:43

Can we override the static method?

RANJIT

Mar 06, 2021 10:16

Can we override the static methods?

RANJIT

Feb 19, 2021 11:05

Can you achieve Runtime Polymorphism by data members?

RANJIT

Apr 20, 2021 12:53

Can you declare an interface method static?

VAMSI

Apr 28, 2021 10:14

Can you declare the main method as final?

JOSHUA

Apr 06, 2021 12:49

Can you have virtual functions in Java?

VAMSI

Mar 30, 2021 12:14

Can you make a constructor final?

VAMSI

Feb 15, 2021 10:54

Can you use abstract and final both with a method?

SANJAY

Apr 27, 2021 10:47

do we have DESTRUCTORS in Java? have never seen an example of a destructor program, only constructor?

RANJIT

Mar 29, 2021 12:22

Does constructor return any value?

JOSHUA

Feb 13, 2021 10:40

For Instance, a Hotel management system can be termed as a software, an app, and also an Information system. Why so many names for just one thing? The concept of a software, and an Information system, there's no difference here, just the names?

JOSHUA

Apr 20, 2021 12:55

How can we access some class in another class in Java?

VAMSI

May 29, 2021 09:32

How many types of constructors are used in Java?

SANJAY

Feb 13, 2021 10:35

How many types of memory areas are allocated by JVM?

SANJAY

Feb 03, 2021 09:40

How to add Bootstrap to Angular 10?

RANJIT

Mar 09, 2021 11:15

How to make a read-only class in Java?

KRISHNA SWAROOP

May 03, 2021 09:58

How to make a write-only class in Java?

PADMAKEECHU

May 04, 2021 13:11

how we can take list from user?

RANJIT

Apr 23, 2021 11:16

I want to upload a large file for my application. but I'm getting a java heap space error. I use optional when getting the file in my application code. How can I add this file by dividing or shredding it?

RANJIT

Apr 07, 2021 11:50

If I don't provide any arguments on the command line, then what will the value stored in the String array passed into the main() method, empty or NULL?

JOSHUA

Feb 08, 2021 08:50

Is constructor inherited?

RANJIT

Feb 15, 2021 10:50

Is delete, next, main, exit or null keyword in java?

SANJAY

Feb 06, 2021 08:38

Is Empty .java file name a valid source file name?

VAMSI

Feb 06, 2021 08:31

Is it possible to instantiate the abstract class?

RANJIT

Apr 28, 2021 10:11

List the features of Java Programming language.

RANJIT

Feb 04, 2021 09:37

One of my s3 is bucket is deleted but i need to restore is there any possible way?

ALLINO

Mar 06, 2021 12:02

RanjitWhat is the output of the following Java program? 1. class Test 2. { 3. int i; 4. } 5. public class Main 6. { 7. public static void main (String args[]) 8. { 9. Test test = new Test(); 10. System.ou

RANJIT

Feb 17, 2021 12:34

What are the advantages of Encapsulation in Java?

FRAUSKY

May 04, 2021 13:15

What are the advantages of Packages in Java?

RANJIT

Feb 10, 2021 08:27

What are the advantages of passing this into a method instead of the current class object itself?

RANJIT

Feb 24, 2021 11:36

What are the differences between this and super keyword?

SANJAY

Mar 02, 2021 10:40

What are the main differences between the Java platform and other platforms?

SANJAY

Feb 04, 2021 10:00

What are the main uses of the super keyword?

VAMSI

Mar 02, 2021 10:38

What are the main uses of this keyword?

JOSHUA

Feb 24, 2021 11:35

What are the most important features of Java?

GANESH MALLA

Jan 23, 2021 09:46

What are the restrictions that are applied to the Java static methods?

JOSHUA

Feb 18, 2021 12:06

What are the various access specifiers in Java?

VAMSI

Feb 09, 2021 11:12

What do you understand by copy constructor in Java?

RANJIT

Feb 16, 2021 11:23

What do you understand by Java virtual machine?

JOSHUA

Feb 03, 2021 09:22

What gives Java its 'write once and run anywhere' nature?

RANJIT

Feb 06, 2021 08:22

What if I write static public void instead of public static void?

RANJIT

Feb 08, 2021 08:52

What if the static modifier is removed from the signature of the main method?

ROHAN

Feb 20, 2021 09:55

What if the static modifier is removed from the signature of the main method?

VAMSI

Mar 08, 2021 12:41

what is a 'translation look-aside buffer'?

JOSHUA

Apr 23, 2021 11:13

What is a marker interface?

SANJAY

Apr 30, 2021 10:21

What is a virtual file system? Give an example.

SANJAY

Apr 19, 2021 12:18

What is aggregation?

RANJIT

Feb 26, 2021 10:21

What is an object?

VAMSI

Feb 11, 2021 11:44

What is classloader?

JOSHUA

Feb 06, 2021 08:26

What is composition?

SANJAY

Feb 27, 2021 10:19

What is Exception Handling?

JOSHUA

Jun 01, 2021 08:24

What is Java instance Of operator?

ROHAN

Apr 22, 2021 12:42

What is Java instanceOf operator?

ROHAN

May 29, 2021 09:17

What is JIT compiler?

JOSHUA

Feb 04, 2021 09:43

What is method overloading?

SANJAY

Mar 03, 2021 10:57

What is method overriding?

SANJAY

Mar 06, 2021 10:15

What is object cloning?

RANJIT

Mar 02, 2021 10:43

What is object-oriented paradigm?

RANJIT

Feb 11, 2021 11:46

What is Runtime Polymorphism?

RANJIT

May 27, 2021 09:23

What is the abstraction?

VAMSI

Apr 15, 2021 13:06

What is the abstraction?

SANJAY

Apr 22, 2021 12:43

What is the base class for Error and Exception?

ROHAN

Jun 05, 2021 13:56

What is the constructor?

VAMSI

Feb 12, 2021 11:07

What is the default value of the local variables?

SANJAY

Feb 08, 2021 08:56

What is the difference between abstraction and encapsulation?

JOSHUA

Apr 15, 2021 13:04

What is the difference between abstraction and encapsulation?

ROHAN

Apr 26, 2021 09:52

What is the difference between aggregation and composition?

RANJIT

Mar 01, 2021 10:55

What is the difference between an object-oriented programming language and object-based programming language?

RANJIT

Feb 12, 2021 11:04

What is the difference between JDK, JRE, and JVM?

VAMSI

Feb 03, 2021 09:37

What is the difference between static binding and dynamic binding?

SANJAY

Apr 21, 2021 12:30

What is the difference between the final method and abstract method?

SANJAY

Apr 10, 2021 12:46

What is the final blank variable?

VAMSI

Apr 02, 2021 13:05

What is the final class?

ROHAN

Apr 01, 2021 13:03

What is the final variable?

SANJAY

Apr 01, 2021 13:04

What is the Inheritance?

RANJIT

Feb 25, 2021 10:01

What is the interface?

JOSHUA

Apr 28, 2021 10:13

What is the output of the following Java program?

SANJAY

Feb 11, 2021 11:48

What is the output of the following Java program? 1. class Test 2. { 3. public static void main (String args[]) 4. { 5. System.out.println(10 * 20 +

SANJAY

Feb 10, 2021 08:40

What is the output of the following Java program? 1. class Test 2. { 3. public static void main (String args[]) 4. { 5. System.out.println(10 + 20 +

JOSHUA

Feb 10, 2021 08:25

What is the output of the following Java program? 1. class Main { 2. public static void main(String args[]){ 3. final int i; 4. i = 20; 5. System.out.println(i); 6. } 7. }

SANJAY

Apr 08, 2021 12:50

What is the output of the following Java program? 1. public class Test 2. { 3. Test(int a, int b) 4. { 5. System.out.println("a = "+a+" b = "+b); 6. } 7. Test(int a, float b) 8. { 9. System.out.println(

VAMSI

Feb 16, 2021 11:25

What is the platform?

VAMSI

Feb 04, 2021 09:53

What is the purpose of a default constructor?

VAMSI

Feb 13, 2021 10:37

What is the purpose of static methods and variables?

JOSHUA

Feb 09, 2021 11:17

What is the static block?

SANJAY

Feb 19, 2021 11:07

100

What is the static method?

VAMSI

Feb 18, 2021 12:09

101

What is the static variable?

VAMSI

Feb 17, 2021 12:36

102

What is this keyword in java?

RANJIT

Feb 23, 2021 10:58

103

what programming language is this? r = s * t x = r + 2 m = w + q

JOSHUA

Mar 30, 2021 11:47

104

What will be the initial value of an object reference which is defined as an instance variable?

JOSHUA

Feb 12, 2021 11:05

105

When can an object reference be cast to an interface reference?

VAMSI

May 01, 2021 07:46

106

Which class is the superclass for all the classes?

SANJAY

Feb 25, 2021 10:07

107

Which is more important - learning to program or learning to debug?

VAMSI

Apr 20, 2021 12:54

108

while I use to attend web development class, the only JavaScript code our teacher used in the project was the login validation.What other things does JavaScript developers do?

VAMSI

Apr 07, 2021 11:53

109

Why can we not override static method?

VAMSI

Mar 09, 2021 11:15

110

Why do we have generic programming?

ROHAN

Apr 19, 2021 11:59

111

Why does Java not support pointers?

ROHAN

Mar 01, 2021 10:57

112

Why is BST not implemented in Java? Or any Tree based data structure.

VAMSI

Apr 12, 2021 12:27

113

Why is Inheritance used in Java?

JOSHUA

Feb 25, 2021 10:04

114

Why is multiple inheritance not supported in java?

ROHAN

Feb 26, 2021 10:16

115

Why is the main method static?

ROHAN

Feb 18, 2021 12:11

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