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	A single try block and multiple catch blocks can co-exist in a Java Program. Explain?	VAMSI	Jan 17, 2022 23:20	0	135
2	Briefly explain the concept of constructor overloading?	SANJAY	Jan 10, 2022 23:31	0	121
3	Can a class have an interface?	SANJAY	Jul 22, 2021 09:03	1	231
4	Can an exception be rethrown?	ROHAN	Aug 07, 2021 11:29	1	200
5	Can finally block be used without a catch?	ROHAN	Jul 05, 2021 14:12	1	237
6	Can I import same package or class twice? Will the JVM load the package twice at runtime?	RANJIT	Jul 02, 2021 13:34	1	236
7	Can I import same package/class twice? Will the JVM load the package twice at runtime?	RANJIT	Sep 07, 2021 00:56	0	139
8	Can the Interface be final?	ROHAN	Apr 30, 2021 10:20	1	276
9	Can there be an abstract method without an abstract class?	ROHAN	Apr 27, 2021 10:46	1	258
10	Can we change the scope of the overridden method in the subclass?	RANJIT	Mar 11, 2021 11:44	1	397
11	Can we declare a constructor as final?	RANJIT	Apr 08, 2021 12:56	2	277
12	Can we declare an interface as final?	JOSHUA	Apr 08, 2021 12:57	0	284
13	Can we declare the static variables and methods in an abstract class?	SANJAY	Feb 20, 2021 10:05	1	271
14	Can we define private and protected modifiers for the members in interfaces?	SANJAY	Aug 17, 2021 04:20	1	209
15	Can we execute a program without main() method?	RANJIT	Mar 08, 2021 12:39	1	268
16	Can we make constructors static?	JOSHUA	Feb 20, 2021 09:56	1	287
17	Can we make the abstract methods static in Java?	VAMSI	Feb 20, 2021 10:02	1	284
18	Can we modify the throws clause of the superclass method while overriding it in the subclass?	VAMSI	Mar 12, 2021 11:15	1	336
19	Can we overload the constructors?	SANJAY	Feb 15, 2021 10:59	1	287
20	Can we overload the main() method?	ROHAN	Mar 03, 2021 10:58	1	264
21	Can we override the overloaded method?	ROHAN	Mar 11, 2021 11:41	1	274
22	Can we override the private methods?	VAMSI	Mar 11, 2021 11:43	1	265
23	Can we override the static method?	RANJIT	Mar 06, 2021 10:16	1	266
24	Can we override the static methods?	RANJIT	Feb 19, 2021 11:05	1	267
25	Can you achieve Runtime Polymorphism by data members?	RANJIT	Apr 20, 2021 12:53	1	263
26	Can you declare an interface method static?	VAMSI	Apr 28, 2021 10:14	1	249
27	Can you declare the main method as final?	JOSHUA	Apr 06, 2021 12:49	1	276
28	Can you have virtual functions in Java?	VAMSI	Mar 30, 2021 12:14	1	279
29	Can you make a constructor final?	VAMSI	Feb 15, 2021 10:54	1	279
30	Can you override a private method in Java?	ROHAN	Jan 18, 2022 23:38	0	123
31	Can you use abstract and final both with a method?	SANJAY	Apr 27, 2021 10:47	1	249
32	Describe and compare fail-fast and fail-safe iterators?	RANJIT	Jan 24, 2022 00:05	0	180
33	Difference between Default and Protected access specifiers?	SANJAY	Jan 28, 2022 03:15	0	168
34	Do I need to import java.lang package any time? Why?	RANJIT	Jun 05, 2021 13:52	1	212
35	do we have DESTRUCTORS in Java? have never seen an example of a destructor program, only constructor?	RANJIT	Mar 29, 2021 12:22	1	279
36	Does constructor return any value?	JOSHUA	Feb 13, 2021 10:40	1	282
37	Does overriding the hashCode() method have any performance implication?	VAMSI	Jan 22, 2022 00:21	0	416
38	Explain the hierarchy of Java Exception classes?	JOSHUA	Sep 20, 2021 01:44	1	221
39	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	202
40	How can constructor chaining be done by using the super keyword?	JOSHUA	Aug 05, 2021 04:13	0	197
41	How can we access some class in another class in Java?	VAMSI	May 29, 2021 09:32	1	241
42	How do you ensure that N thread can access N resources without deadlock?	SANJAY	Jan 21, 2022 01:38	0	177
43	How HashMap works in Java?	JOSHUA	Dec 23, 2021 02:44	0	141
44	How many types of constructors are used in Java?	SANJAY	Feb 13, 2021 10:35	1	272
45	How many types of exception can occur in a Java program?	SANJAY	Sep 17, 2021 02:22	1	230
46	How many types of memory areas are allocated by JVM?	SANJAY	Feb 03, 2021 09:40	1	271
47	How to add Bootstrap to Angular 10?	RANJIT	Mar 09, 2021 11:15	1	269
48	How to make a read-only class in Java?	KRISHNA SWAROOP	May 03, 2021 09:58	1	256
49	How to make a write-only class in Java?	PADMAKEECHU	May 04, 2021 13:11	1	252
50	how we can take list from user?	RANJIT	Apr 23, 2021 11:16	1	251
51	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	207
52	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	281
53	Is constructor inherited?	RANJIT	Feb 15, 2021 10:50	1	283
54	Is delete, next, main, exit or null keyword in java?	SANJAY	Feb 06, 2021 08:38	1	700
55	Is Empty .java file name a valid source file name?	VAMSI	Feb 06, 2021 08:31	1	244
56	Is it possible to instantiate the abstract class?	RANJIT	Apr 28, 2021 10:11	1	228
57	Is Java “pass-by-reference” or “pass-by-value”?	VAMSI	Dec 27, 2021 03:33	1	286
58	Is there any difference between nested classes and inner classes?	VAMSI	Jul 17, 2021 13:20	1	199
59	List the features of Java Programming language.	RANJIT	Feb 04, 2021 09:37	1	277
60	Name some classes present in java.util.regex package?	SANJAY	Jul 06, 2021 15:30	1	188
61	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	277
62	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	245
63	What are anonymous inner classes?	ROHAN	Jul 26, 2021 11:43	1	202
64	What are directives?	SANJAY	Jan 25, 2022 06:26	0	159
65	What are the advantages of defining packages in Java?	JOSHUA	Aug 28, 2021 02:48	1	198
66	What are the advantages of Encapsulation in Java?	FRAUSKY	May 04, 2021 13:15	1	239
67	What are the advantages of Java inner classes?	ROHAN	Jul 07, 2021 15:06	1	190
68	What are the advantages of Packages in Java?	RANJIT	Feb 10, 2021 08:27	1	262
69	What are the advantages of passing this into a method instead of the current class object itself?	RANJIT	Feb 24, 2021 11:36	1	257
70	What are the differences between this and super keyword?	SANJAY	Mar 02, 2021 10:40	1	284
71	What are the main differences between the Java platform and other platforms?	SANJAY	Feb 04, 2021 10:00	1	265
72	What are the main uses of the super keyword?	VAMSI	Mar 02, 2021 10:38	1	261
73	What are the main uses of this keyword?	JOSHUA	Feb 24, 2021 11:35	1	257
74	What are the most important features of Java?	GANESH MALLA	Jan 23, 2021 09:46	1	280
75	What are the restrictions that are applied to the Java static methods?	JOSHUA	Feb 18, 2021 12:06	1	263
76	What are the states in the lifecycle of a Thread?	VAMSI	Jan 13, 2022 04:40	0	117
77	What are the various access specifiers in Java?	VAMSI	Feb 09, 2021 11:12	1	276
78	What do you mean by aggregation?	ROHAN	Dec 27, 2021 00:46	1	176
79	What do you understand by BlockingQueue?	JOSHUA	Nov 27, 2021 05:33	0	166
80	What do you understand by copy constructor in Java?	RANJIT	Feb 16, 2021 11:23	1	263
81	What do you understand by inter-thread communication?	SANJAY	Jul 26, 2021 14:34	1	226
82	What do you understand by Java virtual machine?	JOSHUA	Feb 03, 2021 09:22	2	285
83	What gives Java its 'write once and run anywhere' nature?	RANJIT	Feb 06, 2021 08:22	1	258
84	What if I write static public void instead of public static void?	RANJIT	Feb 08, 2021 08:52	1	271
85	What if the static modifier is removed from the signature of the main method?	ROHAN	Feb 20, 2021 09:55	1	261
86	What if the static modifier is removed from the signature of the main method?	VAMSI	Mar 08, 2021 12:41	1	256
87	what is a 'translation look-aside buffer'?	JOSHUA	Apr 23, 2021 11:13	1	299
88	What is a marker interface?	SANJAY	Apr 30, 2021 10:21	1	247
89	What is a virtual file system? Give an example.	SANJAY	Apr 19, 2021 12:18	1	243
90	What is aggregation?	RANJIT	Feb 26, 2021 10:21	1	272
91	What is an object?	VAMSI	Feb 11, 2021 11:44	1	264
92	What is classloader?	JOSHUA	Feb 06, 2021 08:26	1	278
93	What is composition?	SANJAY	Feb 27, 2021 10:19	1	267
94	What is context switching?	JOSHUA	Jul 27, 2021 14:55	1	206
95	What is covariant return type?	ROHAN	Aug 13, 2021 07:28	1	204
96	What is Exception Handling?	JOSHUA	Jun 01, 2021 08:24	1	222
97	What is exception propagation?	VAMSI	Sep 27, 2021 05:41	1	213
98	What is finally block?	ROHAN	Sep 23, 2021 04:49	1	204
99	What is Hibernate Framework?	RANJIT	Sep 06, 2021 08:49	1	173
100	What is Java instance Of operator?	ROHAN	Apr 22, 2021 12:42	1	255
101	What is Java instanceOf operator?	ROHAN	May 29, 2021 09:17	1	228
102	What is JIT compiler?	JOSHUA	Feb 04, 2021 09:43	1	271
103	What is method overloading?	SANJAY	Mar 03, 2021 10:57	1	258
104	What is method overriding?	SANJAY	Mar 06, 2021 10:15	1	250
105	What is object cloning?	RANJIT	Mar 02, 2021 10:43	1	266
106	What is object pooling?	ROHAN	Dec 21, 2021 01:11	1	157
107	What is object-oriented paradigm?	RANJIT	Feb 11, 2021 11:46	1	276
108	What is Runtime Polymorphism?	RANJIT	May 27, 2021 09:23	1	238
109	What is singleton class? where is it used?	VAMSI	Aug 14, 2021 13:05	1	205
110	What is Stack Overflow Java?	JOSHUA	Jan 13, 2022 00:57	0	121
111	What is String Pool?	ROHAN	Oct 08, 2021 05:11	1	206
112	What is super in java?	RANJIT	Aug 03, 2021 04:43	1	205
113	What is the abstract class?	RANJIT	Aug 14, 2021 00:48	1	195
114	What is the abstraction?	VAMSI	Apr 15, 2021 13:06	0	245
115	What is the abstraction?	SANJAY	Apr 22, 2021 12:43	1	248
116	What is the base class for Error and Exception?	ROHAN	Jun 05, 2021 13:56	1	223
117	What is the constructor?	VAMSI	Feb 12, 2021 11:07	1	266
118	What is the default value of the local variables?	SANJAY	Feb 08, 2021 08:56	1	265
119	What is the difference between a synchronized method and a synchronized block?	ROHAN	Dec 21, 2021 01:03	0	147
120	What is the difference between abstraction and encapsulation?	JOSHUA	Apr 15, 2021 13:04	1	237
121	What is the difference between abstraction and encapsulation?	ROHAN	Apr 26, 2021 09:52	1	229
122	What is the difference between aggregation and composition?	RANJIT	Mar 01, 2021 10:55	1	260
123	What is the difference between an object-oriented programming language and object-based programming language?	RANJIT	Feb 12, 2021 11:04	1	253
124	What is the difference between JDK, JRE, and JVM?	VAMSI	Feb 03, 2021 09:37	1	260
125	What is the difference between static binding and dynamic binding?	SANJAY	Apr 21, 2021 12:30	0	278
126	What is the difference between the final method and abstract method?	SANJAY	Apr 10, 2021 12:46	1	277
127	What is the final blank variable?	VAMSI	Apr 02, 2021 13:05	1	272
128	What is the final class?	ROHAN	Apr 01, 2021 13:03	1	276
129	What is the final variable?	SANJAY	Apr 01, 2021 13:04	1	265
130	What is the Inheritance?	RANJIT	Feb 25, 2021 10:01	1	260
131	What is the interface?	JOSHUA	Apr 28, 2021 10:13	1	236
132	What is the meaning of immutable regarding String?	JOSHUA	Oct 18, 2021 01:55	1	208
133	What is the output of the following Java program?	SANJAY	Feb 11, 2021 11:48	1	272
134	*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	245
135	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	264
136	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	285
137	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	240
138	What is the package?	VAMSI	Aug 25, 2021 05:38	1	203
139	What is the platform?	VAMSI	Feb 04, 2021 09:53	1	263
140	What is the purpose of a default constructor?	VAMSI	Feb 13, 2021 10:37	1	268
141	What is the purpose of static methods and variables?	JOSHUA	Feb 09, 2021 11:17	1	267
142	What is the purpose of toString() method in Java?	RANJIT	Nov 05, 2021 01:23	0	176
143	What is the purpose of using Buffered Input Stream and Buffered Output Stream classes?	RANJIT	Jul 19, 2021 13:53	1	215
144	What is the purpose of wait() method in Java?	RITA	Nov 23, 2021 06:03	1	158
145	What is the static block?	SANJAY	Feb 19, 2021 11:07	1	265
146	What is the static import?	ROHAN	Sep 13, 2021 00:15	1	234
147	What is the static method?	VAMSI	Feb 18, 2021 12:09	1	265
148	What is the static variable?	VAMSI	Feb 17, 2021 12:36	1	261
149	What is this keyword in java?	RANJIT	Feb 23, 2021 10:58	1	262
150	*what programming language is this? r = s t x = r + 2 m = w + q**	JOSHUA	Mar 30, 2021 11:47	1	266
151	What will be the initial value of an object reference which is defined as an instance variable?	JOSHUA	Feb 12, 2021 11:05	1	271
152	What will happen if we put a key object in a HashMap which is already there?	SANJAY	Dec 24, 2021 05:29	1	185
153	What’s wrong with using HashMap in the multi-threaded environment? When get() method go to the infinite loop?	ROHAN	Jan 07, 2022 00:28	0	337
154	When can an object reference be cast to an interface reference?	VAMSI	May 01, 2021 07:46	1	251
155	When do you override hashcode and equals() ?	ROHAN	Dec 25, 2021 04:28	1	272
156	When to use ArrayList and LinkedList?	RANJIT	Nov 25, 2021 04:55	0	144
157	Which class is the superclass for all the classes?	SANJAY	Feb 25, 2021 10:07	1	249
158	Which is more important - learning to program or learning to debug?	VAMSI	Apr 20, 2021 12:54	1	242
159	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	197
160	Why are the objects immutable in java?	VAMSI	Oct 23, 2021 03:59	1	177
161	Why can we not override static method?	VAMSI	Mar 09, 2021 11:15	1	277
162	Why CharArray() is preferred over String to store the password?	JOSHUA	Jul 06, 2021 09:20	1	212
163	Why Collection doesn’t extend the Cloneable and Serializable interfaces?	SANJAY	Dec 30, 2021 02:07	1	286
164	Why do we have generic programming?	ROHAN	Apr 19, 2021 11:59	1	249
165	Why does Java not support pointers?	ROHAN	Mar 01, 2021 10:57	1	317
166	Why is BST not implemented in Java? Or any Tree based data structure.	VAMSI	Apr 12, 2021 12:27	1	242
167	Why is Inheritance used in Java?	JOSHUA	Feb 25, 2021 10:04	1	259
168	Why is multiple inheritance not supported in java?	ROHAN	Feb 26, 2021 10:16	1	249
169	Why is the main method static?	ROHAN	Feb 18, 2021 12:11	1	260
170	Why Java is not 100% Object-oriented?	JOSHUA	Jan 17, 2022 00:57	0	110
171	Why Java is platform independent?	RANJIT	Jan 20, 2022 05:49	0	148

S.No

Question

Posted By

Date

Answers

Views

S.No

Question

Posted By

Date

Answers

Views

A single try block and multiple catch blocks can co-exist in a Java Program. Explain?

VAMSI

Jan 17, 2022 23:20

135

Briefly explain the concept of constructor overloading?

SANJAY

Jan 10, 2022 23:31

121

Can a class have an interface?

SANJAY

Jul 22, 2021 09:03

231

Can an exception be rethrown?

ROHAN

Aug 07, 2021 11:29

200

Can finally block be used without a catch?

ROHAN

Jul 05, 2021 14:12

237

Can I import same package or class twice? Will the JVM load the package twice at runtime?

RANJIT

Jul 02, 2021 13:34

236

Can I import same package/class twice? Will the JVM load the package twice at runtime?

RANJIT

Sep 07, 2021 00:56

139

Can the Interface be final?

ROHAN

Apr 30, 2021 10:20

276

Can there be an abstract method without an abstract class?

ROHAN

Apr 27, 2021 10:46

258

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

RANJIT

Mar 11, 2021 11:44

397

Can we declare a constructor as final?

RANJIT

Apr 08, 2021 12:56

277

Can we declare an interface as final?

JOSHUA

Apr 08, 2021 12:57

284

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

SANJAY

Feb 20, 2021 10:05

271

Can we define private and protected modifiers for the members in interfaces?

SANJAY

Aug 17, 2021 04:20

209

Can we execute a program without main() method?

RANJIT

Mar 08, 2021 12:39

268

Can we make constructors static?

JOSHUA

Feb 20, 2021 09:56

287

Can we make the abstract methods static in Java?

VAMSI

Feb 20, 2021 10:02

284

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

VAMSI

Mar 12, 2021 11:15

336

Can we overload the constructors?

SANJAY

Feb 15, 2021 10:59

287

Can we overload the main() method?

ROHAN

Mar 03, 2021 10:58

264

Can we override the overloaded method?

ROHAN

Mar 11, 2021 11:41

274

Can we override the private methods?

VAMSI

Mar 11, 2021 11:43

265

Can we override the static method?

RANJIT

Mar 06, 2021 10:16

266

Can we override the static methods?

RANJIT

Feb 19, 2021 11:05

267

Can you achieve Runtime Polymorphism by data members?

RANJIT

Apr 20, 2021 12:53

263

Can you declare an interface method static?

VAMSI

Apr 28, 2021 10:14

249

Can you declare the main method as final?

JOSHUA

Apr 06, 2021 12:49

276

Can you have virtual functions in Java?

VAMSI

Mar 30, 2021 12:14

279

Can you make a constructor final?

VAMSI

Feb 15, 2021 10:54

279

Can you override a private method in Java?

ROHAN

Jan 18, 2022 23:38

123

Can you use abstract and final both with a method?

SANJAY

Apr 27, 2021 10:47

249

Describe and compare fail-fast and fail-safe iterators?

RANJIT

Jan 24, 2022 00:05

180

Difference between Default and Protected access specifiers?

SANJAY

Jan 28, 2022 03:15

168

Do I need to import java.lang package any time? Why?

RANJIT

Jun 05, 2021 13:52

212

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

RANJIT

Mar 29, 2021 12:22

279

Does constructor return any value?

JOSHUA

Feb 13, 2021 10:40

282

Does overriding the hashCode() method have any performance implication?

VAMSI

Jan 22, 2022 00:21

416

Explain the hierarchy of Java Exception classes?

JOSHUA

Sep 20, 2021 01:44

221

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

202

How can constructor chaining be done by using the super keyword?

JOSHUA

Aug 05, 2021 04:13

197

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

VAMSI

May 29, 2021 09:32

241

How do you ensure that N thread can access N resources without deadlock?

SANJAY

Jan 21, 2022 01:38

177

How HashMap works in Java?

JOSHUA

Dec 23, 2021 02:44

141

How many types of constructors are used in Java?

SANJAY

Feb 13, 2021 10:35

272

How many types of exception can occur in a Java program?

SANJAY

Sep 17, 2021 02:22

230

How many types of memory areas are allocated by JVM?

SANJAY

Feb 03, 2021 09:40

271

How to add Bootstrap to Angular 10?

RANJIT

Mar 09, 2021 11:15

269

How to make a read-only class in Java?

KRISHNA SWAROOP

May 03, 2021 09:58

256

How to make a write-only class in Java?

PADMAKEECHU

May 04, 2021 13:11

252

how we can take list from user?

RANJIT

Apr 23, 2021 11:16

251

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

207

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

281

Is constructor inherited?

RANJIT

Feb 15, 2021 10:50

283

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

SANJAY

Feb 06, 2021 08:38

700

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

VAMSI

Feb 06, 2021 08:31

244

Is it possible to instantiate the abstract class?

RANJIT

Apr 28, 2021 10:11

228

Is Java “pass-by-reference” or “pass-by-value”?

VAMSI

Dec 27, 2021 03:33

286

Is there any difference between nested classes and inner classes?

VAMSI

Jul 17, 2021 13:20

199

List the features of Java Programming language.

RANJIT

Feb 04, 2021 09:37

277

Name some classes present in java.util.regex package?

SANJAY

Jul 06, 2021 15:30

188

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

ALLINO

Mar 06, 2021 12:02

277

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

245

What are anonymous inner classes?

ROHAN

Jul 26, 2021 11:43

202

What are directives?

SANJAY

Jan 25, 2022 06:26

159

What are the advantages of defining packages in Java?

JOSHUA

Aug 28, 2021 02:48

198

What are the advantages of Encapsulation in Java?

FRAUSKY

May 04, 2021 13:15

239

What are the advantages of Java inner classes?

ROHAN

Jul 07, 2021 15:06

190

What are the advantages of Packages in Java?

RANJIT

Feb 10, 2021 08:27

262

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

RANJIT

Feb 24, 2021 11:36

257

What are the differences between this and super keyword?

SANJAY

Mar 02, 2021 10:40

284

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

SANJAY

Feb 04, 2021 10:00

265

What are the main uses of the super keyword?

VAMSI

Mar 02, 2021 10:38

261

What are the main uses of this keyword?

JOSHUA

Feb 24, 2021 11:35

257

What are the most important features of Java?

GANESH MALLA

Jan 23, 2021 09:46

280

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

JOSHUA

Feb 18, 2021 12:06

263

What are the states in the lifecycle of a Thread?

VAMSI

Jan 13, 2022 04:40

117

What are the various access specifiers in Java?

VAMSI

Feb 09, 2021 11:12

276

What do you mean by aggregation?

ROHAN

Dec 27, 2021 00:46

176

What do you understand by BlockingQueue?

JOSHUA

Nov 27, 2021 05:33

166

What do you understand by copy constructor in Java?

RANJIT

Feb 16, 2021 11:23

263

What do you understand by inter-thread communication?

SANJAY

Jul 26, 2021 14:34

226

What do you understand by Java virtual machine?

JOSHUA

Feb 03, 2021 09:22

285

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

RANJIT

Feb 06, 2021 08:22

258

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

RANJIT

Feb 08, 2021 08:52

271

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

ROHAN

Feb 20, 2021 09:55

261

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

VAMSI

Mar 08, 2021 12:41

256

what is a 'translation look-aside buffer'?

JOSHUA

Apr 23, 2021 11:13

299

What is a marker interface?

SANJAY

Apr 30, 2021 10:21

247

What is a virtual file system? Give an example.

SANJAY

Apr 19, 2021 12:18

243

What is aggregation?

RANJIT

Feb 26, 2021 10:21

272

What is an object?

VAMSI

Feb 11, 2021 11:44

264

What is classloader?

JOSHUA

Feb 06, 2021 08:26

278

What is composition?

SANJAY

Feb 27, 2021 10:19

267

What is context switching?

JOSHUA

Jul 27, 2021 14:55

206

What is covariant return type?

ROHAN

Aug 13, 2021 07:28

204

What is Exception Handling?

JOSHUA

Jun 01, 2021 08:24

222

What is exception propagation?

VAMSI

Sep 27, 2021 05:41

213

What is finally block?

ROHAN

Sep 23, 2021 04:49

204

What is Hibernate Framework?

RANJIT

Sep 06, 2021 08:49

173

100

What is Java instance Of operator?

ROHAN

Apr 22, 2021 12:42

255

101

What is Java instanceOf operator?

ROHAN

May 29, 2021 09:17

228

102

What is JIT compiler?

JOSHUA

Feb 04, 2021 09:43

271

103

What is method overloading?

SANJAY

Mar 03, 2021 10:57

258

104

What is method overriding?

SANJAY

Mar 06, 2021 10:15

250

105

What is object cloning?

RANJIT

Mar 02, 2021 10:43

266

106

What is object pooling?

ROHAN

Dec 21, 2021 01:11

157

107

What is object-oriented paradigm?

RANJIT

Feb 11, 2021 11:46

276

108

What is Runtime Polymorphism?

RANJIT

May 27, 2021 09:23

238

109

What is singleton class? where is it used?

VAMSI

Aug 14, 2021 13:05

205

110

What is Stack Overflow Java?

JOSHUA

Jan 13, 2022 00:57

121

111

What is String Pool?

ROHAN

Oct 08, 2021 05:11

206

112

What is super in java?

RANJIT

Aug 03, 2021 04:43

205

113

What is the abstract class?

RANJIT

Aug 14, 2021 00:48

195

114

What is the abstraction?

VAMSI

Apr 15, 2021 13:06

245

115

What is the abstraction?

SANJAY

Apr 22, 2021 12:43

248

116

What is the base class for Error and Exception?

ROHAN

Jun 05, 2021 13:56

223

117

What is the constructor?

VAMSI

Feb 12, 2021 11:07

266

118

What is the default value of the local variables?

SANJAY

Feb 08, 2021 08:56

265

119

What is the difference between a synchronized method and a synchronized block?

ROHAN

Dec 21, 2021 01:03

147

120

What is the difference between abstraction and encapsulation?

JOSHUA

Apr 15, 2021 13:04

237

121

What is the difference between abstraction and encapsulation?

ROHAN

Apr 26, 2021 09:52

229

122

What is the difference between aggregation and composition?

RANJIT

Mar 01, 2021 10:55

260

123

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

RANJIT

Feb 12, 2021 11:04

253

124

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

VAMSI

Feb 03, 2021 09:37

260

125

What is the difference between static binding and dynamic binding?

SANJAY

Apr 21, 2021 12:30

278

126

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

SANJAY

Apr 10, 2021 12:46

277

127

What is the final blank variable?

VAMSI

Apr 02, 2021 13:05

272

128

What is the final class?

ROHAN

Apr 01, 2021 13:03

276

129

What is the final variable?

SANJAY

Apr 01, 2021 13:04

265

130

What is the Inheritance?

RANJIT

Feb 25, 2021 10:01

260

131

What is the interface?

JOSHUA

Apr 28, 2021 10:13

236

132

What is the meaning of immutable regarding String?

JOSHUA

Oct 18, 2021 01:55

208

133

What is the output of the following Java program?

SANJAY

Feb 11, 2021 11:48

272

134

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

245

135

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

264

136

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

285

137

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

240

138

What is the package?

VAMSI

Aug 25, 2021 05:38

203

139

What is the platform?

VAMSI

Feb 04, 2021 09:53

263

140

What is the purpose of a default constructor?

VAMSI

Feb 13, 2021 10:37

268

141

What is the purpose of static methods and variables?

JOSHUA

Feb 09, 2021 11:17

267

142

What is the purpose of toString() method in Java?

RANJIT

Nov 05, 2021 01:23

176

143

What is the purpose of using Buffered Input Stream and Buffered Output Stream classes?

RANJIT

Jul 19, 2021 13:53

215

144

What is the purpose of wait() method in Java?

RITA

Nov 23, 2021 06:03

158

145

What is the static block?

SANJAY

Feb 19, 2021 11:07

265

146

What is the static import?

ROHAN

Sep 13, 2021 00:15

234

147

What is the static method?

VAMSI

Feb 18, 2021 12:09

265

148

What is the static variable?

VAMSI

Feb 17, 2021 12:36

261

149

What is this keyword in java?

RANJIT

Feb 23, 2021 10:58

262

150

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

JOSHUA

Mar 30, 2021 11:47

266

151

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

JOSHUA

Feb 12, 2021 11:05

271

152

What will happen if we put a key object in a HashMap which is already there?

SANJAY

Dec 24, 2021 05:29

185

153

What’s wrong with using HashMap in the multi-threaded environment? When get() method go to the infinite loop?

ROHAN

Jan 07, 2022 00:28

337

154

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

VAMSI

May 01, 2021 07:46

251

155

When do you override hashcode and equals() ?

ROHAN

Dec 25, 2021 04:28

272

156

When to use ArrayList and LinkedList?

RANJIT

Nov 25, 2021 04:55

144

157

Which class is the superclass for all the classes?

SANJAY

Feb 25, 2021 10:07

249

158

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

VAMSI

Apr 20, 2021 12:54

242

159

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

197

160

Why are the objects immutable in java?

VAMSI

Oct 23, 2021 03:59

177

161

Why can we not override static method?

VAMSI

Mar 09, 2021 11:15

277

162

Why CharArray() is preferred over String to store the password?

JOSHUA

Jul 06, 2021 09:20

212

163

Why Collection doesn’t extend the Cloneable and Serializable interfaces?

SANJAY

Dec 30, 2021 02:07

286

164

Why do we have generic programming?

ROHAN

Apr 19, 2021 11:59

249

165

Why does Java not support pointers?

ROHAN

Mar 01, 2021 10:57

317

166

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

VAMSI

Apr 12, 2021 12:27

242

167

Why is Inheritance used in Java?

JOSHUA

Feb 25, 2021 10:04

259

168

Why is multiple inheritance not supported in java?

ROHAN

Feb 26, 2021 10:16

249

169

Why is the main method static?

ROHAN

Feb 18, 2021 12:11

260

170

Why Java is not 100% Object-oriented?

JOSHUA

Jan 17, 2022 00:57

110

171

Why Java is platform independent?

RANJIT

Jan 20, 2022 05:49

148

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