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Core Java Interview questions


Total available count: 637
Subject - Java Technologies
Subsubject - Core Java
1
What is java virtual machine(JVM)?
2
What is the function of bootstrap classloader?
3
What is the function of Extensions class loader in java?
4
What is the difference between class and object in java?
5
How object can be created using Class.forName()in java?
6
How object can be created using newinstance() in java?
7
The method clone() throws which exception?
8
The method finalize() throws which exception?
9
What is returned by the method toString() in java?
10
How many type of variables available in java,mention them?
11
Is there any difference if i use public static void main(String[] args) instead of public static void main(String args[])?
12
What do you know about Synchronized non access modifier in java?
13
What do you know about serialize of object and serilization in java?
14
What is the difference between newinstance() method in Class.forName() method in java?
15
Which Exception is thrown if try to use clone() method with implementing Cloneable interface in java?
16
Can we access clone() method from outside the package in java?
17
Can we execute a program without main() method in java?
18
Which class is the superclass for every class in java?
19
Can we overload main() method?
20
Which is an example for Polymorphism,overloading or overriding?
21
Can you give example for Error in java?
22
Can you give example for Exception in java?
23
How many types of Errors are available in java?
24
Can we stop excecution of "finally" block in java?
25
What do you know about innerclass in java?
26
What do you know about Normal Inner Class in java?
27
How to get "this" for outer class if "this" is referencing inner class in java?
28
What do you know about Ananymous Inner Class in java?
29
Write the syntax to use Ananymous Inner Class in java?
30
In how many ways we can declare two dimensional arrays in java?
31
In case of Multidimensional array,is it compulsory to mention size limit of all dimensions?
32
Why String is immutable in java?
33
What the function of length() method of String class in java?
34
What the function of format(String format, Object... args) method of String class in java?
35
What the function of format(Locale l, String format, Object... args) method of String class in java?
36
What the function of substring(int beginIndex) method of String class in java?
37
What the function of contains(CharSequence s) method of String class in java?
38
What the function of join(CharSequence delimiter, CharSequence... elements) method of String class in java?
39
What the function of isEmpty() method of String class in java?
40
What the function of replace(char old, char new) method of String class in java?
41
What the function of replace(CharSequence old, CharSequence new) method of String class in java?
42
What the function of trim() method of String class in java?
43
What the function of split(String regex) method of String class in java?
44
What the function of split(String regex, int limit) method of String class in java?
45
What the function of intern() method of String class in java?
46
What the function of indexOf(int ch) method of String class in java?
47
What the function of indexOf(int ch, int fromIndex) method of String class in java?
48
What the function of indexOf(String substring) method of String class in java?
49
What the function of indexOf(String substring, int fromIndex) method of String class in java?
50
What the function of toLowerCase() method of String class in java?
51
What the function of toUpperCase() method of String class in java?
52
What are static methods available in string class in java?
53
What is the return type of length() method of java.lang.String class in java?
54
What is the return type of isEmpty() method of java.lang.String class in java?
55
What is the return type of trim() method of java.lang.String class in java?
56
What is the return type of intern() method of java.lang.String class in java?
57
What is the return type of toLowerCase() method of java.lang.String class in java?
58
What is the return type of toUpperCase() method of java.lang.String class in java?
59
Which exception does charAt() method of string throws in java?
60
What is the return type of toUpperCase(Locale l) method of java.lang.String class in java?
61
What the function of endsWith(String suffix) method of String class in java?
62
The equals() method of string class overrides which class method in java?
63
When will equals(Object anotherObject) method of string returns false in java?
64
Which exceptions does String.format() method throws in java?
65
When will String.format(String format, Object... args) method throws "NullPointerException" in java?
66
When will String.format(String format, Object... args) method throws "IllegalFormatException" in java?
67
What the function of getBytes() method of String class in java?
68
What is the return type of getBytes() method of java.lang.String class in java?
69
From which version isEmpty() method of String class is available in java?
70
When will isEmpty() method of string returns true in java?
71
When will isEmpty() method of string returns false in java?
72
From which version join() method of String class is available in java?
73
Which exceptions does String.join(CharSequence delimiter, CharSequence... elements) method throws in java?
74
When will String.join(CharSequence delimiter, CharSequence... elements) method throws "NullPointerException" in java?
75
From which version replace(CharSequence target, CharSequence replacement) method of String class is available in java?
76
What the function of replaceAll(String regex, String replacement) method of String class in java?
77
What is the return type of replaceAll(String regex, String replacement) method of java.lang.String class in java?
78
From which version split() method of String class is available in java?
79
Which exception does split(String regex) method of string throws in java?
80
When will split(String regex) method throws "PatternSyntaxException" in java?
81
What the function of startsWith(String prefix) method of String class in java?
82
What is the return type of startsWith(String prefix) method of java.lang.String class in java?
83
Which exception does substring(int startIndex, int endIndex) method of string throws in java?
84
When will substring(int startIndex, int endIndex) method throws "StringIndexOutOfBoundsException" in java?
85
What the function of toCharArray() method of String class in java?
86
What is the return type of toCharArray() method of java.lang.String class in java?
87
What the function of valueOf(boolean b) method of String class in java?
88
What the function of valueOf(char[] c) method of String class in java?
89
What the function of valueOf(int i) method of String class in java?
90
What the function of valueOf(long l) method of String class in java?
91
What the function of valueOf(float f) method of String class in java?
92
What the function of valueOf(double d) method of String class in java?
93
What the function of valueOf(Object o) method of String class in java?
94
What is the return type of valueOf(boolean b) method of java.lang.String class in java?
95
What is the return type of valueOf(char[] c) method of java.lang.String class in java?
96
What is the return type of valueOf(int i) method of java.lang.String class in java?
97
What is the return type of valueOf(long l) method of java.lang.String class in java?
98
What is the return type of valueOf(float f) method of java.lang.String class in java?
99
What is the return type of valueOf(double d) method of java.lang.String class in java?
100
What is the return type of valueOf(Object o) method of java.lang.String class in java?
101
What do you know about StringBuffer class in java?
102
Can muliple threads access simultaneously in the case of StringBuffer class in java?
103
What are the different type of constructors available in StringBuffer class in java?
104
What is the importance of StringBuffer() constructor of StringBuffer class in java?
105
What is the importance of StringBuffer(String str) constructor of StringBuffer class in java?
106
What is the importance of StringBuffer(int capacity) constructor of StringBuffer class in java?
107
What the function of append(String s) method of StringBuffer class in java?
108
What the function of insert(int offset, String s) method of StringBuffer class in java?
109
What the function of replace(int startIndex, int endIndex, String str) method of StringBuffer class in java?
110
What the function of delete(int startIndex, int endIndex) method of StringBuffer class in java?
111
What the function of reverse() method of StringBuffer class in java?
112
What the function of ensureCapacity(int minimumCapacity) method of StringBuffer class in java?
113
What the function of charAt(int index) method of StringBuffer class in java?
114
What the function of length() method of StringBuffer class in java?
115
What the function of substring(int beginIndex) method of StringBuffer class in java?
116
What the function of substring(int beginIndex, int endIndex) method of StringBuffer class in java?
117
What the function of capacity() method of StringBuffer class in java?
118
What are the synchronized methods available in StringBuffer class in java?
119
What is the return type of append(String s) method of StringBuffer class in java?
120
What is the return type of insert(int offset, String s) method of StringBuffer class in java?
121
What is the return type of replace(int startIndex, int endIndex, String str) method of StringBuffer class in java?
122
What is the return type of delete(int startIndex, int endIndex) method of StringBuffer class in java?
123
What is the return type of reverse() method of StringBuffer class in java?
124
What is the return type of capacity() method of StringBuffer class in java?
125
What is the return type of ensureCapacity(int minimumCapacity) method of StringBuffer class in java?
126
What is the return type of charAt(int index) method of StringBuffer class in java?
127
What is the return type of length() method of StringBuffer class in java?
128
What is the return type of substring(int beginIndex) method of StringBuffer class in java?
129
What is the return type of substring(int beginIndex, int endIndex) method of StringBuffer class in java?
130
What is mutable string and which are used to create mutable string in java?
131
What is default capacity of StringBuffer() constructer of StringBuffer class?
132
What do you know about StringBuilder class in java?
133
From which version of java,StringBuilder class is available?
134
What are the different type of constructors available in StringBuilder class in java?
135
What is the importance of StringBuilder() constructor of StringBuilder class in java?
136
What is the importance of StringBuilder(String str) constructor of StringBuilder class in java?
137
What is the importance of StringBuilder(int length) constructor of StringBuilder class in java?
138
What the function of append(String s) method of StringBuilder class in java?
139
What the function of insert(int offset, String s) method of StringBuilder class in java?
140
What the function of replace(int startIndex, int endIndex, String str) method of StringBuilder class in java?
141
What the function of delete(int startIndex, int endIndex) method of StringBuilder class in java?
142
What the function of reverse() method of StringBuilder class in java?
143
What the function of capacity() method of StringBuilder class in java?
144
What the function of ensureCapacity(int minimumCapacity) method of StringBuilder class in java?
145
What the function of charAt(int index) method of StringBuilder class in java?
146
What the function of length() method of StringBuilder class in java?
147
What the function of substring(int beginIndex) method of StringBuilder class in java?
148
What the function of substring(int beginIndex, int endIndex) method of StringBuilder class in java?
149
What is the return type of append(String s) method of StringBuilder class in java?
150
What is the return type of insert(int offset, String s) method of StringBuilder class in java?
151
What is the return type of replace(int startIndex, int endIndex, String str) method of StringBuilder class in java?
152
What is the return type of delete(int startIndex, int endIndex) method of StringBuilder class in java?
153
What is the return type of reverse() method of StringBuilder class in java?
154
What is the return type of capacity() method of StringBuilder class in java?
155
What is the return type of ensureCapacity(int minimumCapacity) method of StringBuilder class in java?
156
What is the return type of charAt(int index) method of StringBuilder class in java?
157
What is the return type of length() method of StringBuilder class in java?
158
What is the return type of substring(int beginIndex) method of StringBuilder class in java?
159
What is the return type of substring(int beginIndex, int endIndex) method of StringBuilder class in java?
160
What is default capacity of StringBuilder() constructer of StringBuilder class?
161
Differentiate between String and StringBuffer in java?
162
Differentiate between StringBuffer and StringBuilder in java?
163
Which method is used to represent object as string in java?
164
What do you know about StringTokenizer class in java?
165
What are the different type of constructors available in StringTokenizer class in java?
166
What is the importance of StringTokenizer(String str) constructor of StringTokenizer class in java?
167
What is the importance of StringTokenizer(String str, String delim) constructor of StringTokenizer class in java?
168
What is the importance of StringTokenizer(String str, String delim, boolean returnValue) constructor of StringTokenizer class in java?
169
What the function of hasMoreTokens() method of StringTokenizer class in java?
170
What the function of nextToken() method of StringTokenizer class in java?
171
What the function of nextToken(String delim) method of StringTokenizer class in java?
172
What the function of hasMoreElements() method of StringTokenizer class in java?
173
What the function of nextElement() method of StringTokenizer class in java?
174
What the function of countTokens() method of StringTokenizer class in java?
175
What is the return type of hasMoreTokens() method of StringTokenizer class in java?
176
What is the return type of nextToken() method of StringTokenizer class in java?
177
What is the return type of nextToken(String delim) method of StringTokenizer class in java?
178
What is the return type of hasMoreElements() method of StringTokenizer class in java?
179
What is the return type of nextElement() method of StringTokenizer class in java?
180
What is the return type of countTokens() method of StringTokenizer class in java?
181
What do you know about Multithreading in java?
182
What are the advantages of multi-threading in java?
183
What do you know about Multitasking and in how many ways of Multitasking can be acheived?
184
What do you know about Thread in java?
185
What are the different states of thread in java?
186
In how many ways we can create Thread in java?
187
What are the commonly used Constructors of Thread class in java?
188
How many methods are there in Runnable Interface in java?
189
What is function of run() method of thread class in java?
190
What is function of start() method of thread class in java?
191
What is function of sleep(long miliseconds) method of thread class in java?
192
What is function of join() method of thread class in java?
193
What is function of join(long miliseconds) method of thread class in java?
194
What is function of getPriority() method of thread class in java?
195
What is function of setPriority(int priority) method of thread class in java?
196
What is function of getName() method of thread class in java?
197
What is function of setName(String name) method of thread class in java?
198
What is function of currentThread() method of thread class in java?
199
Describe what is java?
200
Is java platform dependent or not?
201
Describe object oriented programming and what is object ?
202
Which latest version of java is in market and when it released?
203
What is CLASSPATH and is the purpose of it?
204
Which environment variable points to java home directory?
205
How to set JAVA_HOME or JRE_HOME environment variable in windows 7 and 8?
206
What is the command to check java is properly installed in computer?
207
What is the responsibility of class loader in Java?
208
What is java ClassLoader and function of it?
209
What is java virtual machine(JVM)?
210
How many classloaders are there and name them in Java?
211
What is the function of System class loader in Java?
212
Which class implements Extensions class loader?
213
Which class implements System Class Loader in java?
214
What is the difference between class and object in java?
215
In how many ways object can be created in java?
216
How object can be created using new keyword in java?
217
How object can be created using Class.forName() in java?
218
How object can be created using clone() in java?
219
How object can be created using newinstance() in java?
220
How object can be created using object deserialization in java?
221
What is object class in java?
222
What is upcasting in java?
223
What is downcasting in java?
224
The method clone() throws which exception?
225
The method finalize() throws which exception?
226
Which method is invoked by the garbage collector before object is being garbage collected?
227
What is returned by the method toString() in java?
228
How many types of access modifiers are available in java, mention them?
229
What is the visibility of private access modifier?
230
What is the visibility of public access modifier?
231
What is visibility of protected access modifier?
232
What is visibility of default(no specifier) access modifier?
233
What is the difference between protected and default(no specifier) access modifier?
234
How many type of variables available in java, mention them?
235
What is instance variable in java?
236
In how many ways we can access static fields(variables or methods) in java?
237
What is class variable(static variable) in java?
238
What is local variables in java?
239
Why the main method in java is void?
240
Why the main method in java is static?
241
Why the main method in java is public ?
242
What happen if main method is not declared as public,static and void in java?
243
Is there any difference if i use public static void main(String[] args) instead of public static void main(String args[])?
244
Can we shuffle the words public, static and void of main method in java?
245
What is meant by access modifier in java?
246
What is meant by non access modifier in java?
247
What are the different types of non access modifiers available in java?
248
What is final class and give example for final in java?
249
When will we use final methods in java?
250
What meant by final variable and how will we declare?
251
What is meant by abstract class in java?
252
Can we instantiate abstract class in java?
253
Is it compulsory for a abstract class to have abstract methods?
254
Can a normal class have an abstract method in java?
255
What is meant by abstract method in java?
256
Is it compulsory for a subclass of abstract class to provide implementation of abstract method?
257
What do you know about serialize of object and serialization in java?
258
What do you know about de-serialization and de-serialize of object?
259
What is the difference between serialization and de-serialization in java?
260
What do you know about transient Modifier in java?
261
What do you know about volatile modifier in java?
262
What do you know about native modifier in java?
263
What do you know about Strictfp modifier in java?
264
What is the difference between newinstance() method in Class.forName() method in java?
265
Which Exception is thrown if try to use clone() method with implementing Cloneable interface in java?
266
Can we access clone() method from outside the package in java?
267
What is this keyword in java or importance of this keyword in java?
268
What do you know about variable hiding in java?
269
How can we overcome the variable hiding problem in java?
270
What is meant by Explicit Constructor Invocation in java?
271
Can we use both "this" and "super" keywords in constructor?
272
Is "static" keyword can be applied to interfaces in java?
273
Is "static" keyword can be applied to Constructor in java?
274
Is "static" keyword can be applied to Inner Class methods in java?
275
Is "static" keyword can be applied to Class (Not Nested) in java?
276
How many types of constructor in java and what are they?
277
Can we inherit constructor in java?
278
Can constructor perform other tasks instead of initialization?
279
Which keyword helps to prevent overriden and inherit in java?
280
Can we use final for constructor?
281
What is immutable class and give an example?
282
What is the difference between Abstraction and Encapsulation in java?
283
What do you know about static method in java?
284
Why main method is static in java?
285
Can we execute a program without main() method in java?
286
What if the static modifier is removed from the signature of the main method?
287
What is difference between static (class) method and instance method in java?
288
Is "static" keyword can be applied to Method Local Inner Class in java?
289
Which class is the super class for every class in java?
290
Why Java does not support pointers?
291
Is java supports multiple inheritance?
292
What is object cloning in java?
293
Can we overload main() method?
294
Can you have virtual functions in Java?
295
What is the Difference between method Overloading and Overriding in java?
296
Can we overridden Static methods in java?
297
What do you know about Interface in Java?
298
Does java supports multiple inheritance or not and how?
299
What do you Know about Marked or Tagged Interface in java ?
300
Give me some examples about Marked or Tagged Interfaces in java?
301
What do you know about Nested interfaces in java?
302
Is it necessary for a class to provide all methods implementation when it implements interface?
303
Which keywords are used when a class inherits interface and interface inherits interface in java?
304
Is it possible to instantiate interface in java?
305
Is it possible to instantiate abstract class in java?
306
Can you give example for nested interface in java?
307
Can we use final for methods in an Interface?
308
Can you differentiate abstract class and interface in java?
309
Can we write main method in abstract class in java?
310
Can an interface have static methods in java?
311
Is it necessary for a abstract class to provide method implementation when it implements interface?
312
What do you know about overloading in java?
313
Which is an example for Polymorphism: overloading or overriding?
314
How many types of polymorphism available in java?
315
Define Compile time polymorphism and give an example in java?
316
Define Run time polymorphism and give an example in java?
317
Differentiate overloading and overriding in java?
318
Can we override final method in java?
319
What do you know about covariant return type in java?
320
What do you know about contravariant in java?
321
What do you know about invariant in java?
322
Can we override private methods in java?
323
Is Error and Exception is same or different in java?
324
What do you know about Error in java?
325
What do you know about Exception in java?
326
Differentiate Error and Exception in java?
327
Can we handle Errors using try-catch block in java?
328
How many types of Exceptions are available in java?
329
What do you know about Checked Exceptions in java?
330
What do you know about Unchecked Exceptions in java?
331
Differentiate Checked and Unchecked Exceptions?
332
Can you give example for Checked Exception in java?
333
Can you give example for UnChecked Exception in java?
334
Can we write "try" block alone in java?
335
What do you know about "finally" keyword in java?
336
What do you know about "try" and "catch" keywords in java?
337
Can we stop execution of finally block in java?
338
What do you know about inner class in java?
339
Which member of the outer class can be accessed by inner class instance?
340
Mainly how many types of inner class can be available in java?
341
What do you know about Normal Inner Class in java?
342
Can we directly execute the normal inner class file with java command?
343
Write the code to create new object for normal inner class in java?
344
Suppose we have a class called Outer and with in it another class called Inner.what happen if we compile OuterClass file?
345
How many access modifiers can be applied on normal inner class?
346
What do you know about Method Local Inner class in java?
347
Where can Method local inner class can be instantiated in java?
348
Can Method Local inner class access variable defined in the method in java?
349
Can Method Local inner class access instance variable in java?
350
How many access modifiers can be applied on Method Local inner class in java?
351
What do you know about Static Inner class in java?
352
Can Static nested class access non static member of outer class in java?
353
What do you know about Anonymous Inner Class in java?
354
Write the syntax to use Anonymous Inner Class in java?
355
What do you know about array in java?
356
Mention advantages of array in java?
357
Mention disadvantages of array in java?
358
How many types of arrays available in java?
359
In how many ways we can declare single dimensional arrays in java?
360
Can we include size of array at declaration in java?
361
Show me the syntax for declaration and instantiation of array in java?
362
Show me the syntax for declaration,instantiation and initialization of array in java?
363
What do you know about multidimensional array in java?
364
In case of Multidimensional array, is it compulsory to mention size limit of all dimensions?
365
What do you know about String class in java?
366
Which interfaces that String implements in java?
367
In how many ways String object can be created in java?
368
How can you create String object using String literal with example?
369
Will it create two objects If two strings have same value using String literal in java?
370
How can you create String object using new keyword with example?
371
What is the difference between creating string object using string literal and using new keyword in java?
372
Which can be used to overcome the immutable property of String in java?
373
String Object belongs to which package in java?
374
Can we change the value of String object once assigned in java?
375
What the function of CharAt(int index) method of String class in java?
376
What the function of length() method of String class in java?
377
What the function of substring(int beginIndex, int endIndex) method of String class in java?
378
What the function of equals(Object another) method of String class in java?
379
What the function of isEmpty() method of String class in java?
380
What the function of concat(String str) method of String class in java?
381
What the function of trim() method of String class in java?
382
What the function of split(String reg, int limit) method of String class in java?
383
What the function of intern() method of String class in java?
384
What the function of toLowerCase() method of String class in java?
385
What the function of toLowerCase(Locale l) method of String class in java?
386
What the function of toUpperCase() method of String class in java?
387
What the function of toUpperCase(Locale l) method of String class in java?
388
What is the return type of charAt(int index) method of java.lang.String class in java?
389
What is the return type of length() method of java.lang.String class in java?
390
What is the return type of format(String format, Object... args) method of java.lang.String class in java?
391
What is the return type of format(Locale l, String format, Object... args) method of java.lang.String class in java?
392
What is the return type of substring(int beginIndex) method of java.lang.String class in java?
393
What is the return type of substring(int beginIndex, int endIndex) method of java.lang.String class in java?
394
What is the return type of contains(CharSequence s) method of java.lang.String class in java?
395
What is the return type of join(CharSequence delimiter, CharSequence... elements) method of java.lang.String class in java?
396
What is the return type of equals(Object another) method of java.lang.String class in java?
397
What is the return type of isEmpty() method of java.lang.String class in java?
398
What is the return type of concat(String str) method of java.lang.String class in java?
399
What is the return type of replace(char old, char new) method of java.lang.String class in java?
400
What is the return type of replace(CharSequence old, CharSequence new) method of java.lang.String class in java?
401
What is the return type of trim() method of java.lang.String class in java?
402
What is the return type of split(String regex) method of java.lang.String class in java?
403
What is the return type of split(String regex, int limit) method of java.lang.String class in java?
404
What is the return type of intern() method of java.lang.String class in java?
405
What is the return type of indexOf(int ch) method of java.lang.String class in java?
406
What is the return type of indexOf(int ch, int fromIndex) method of java.lang.String class in java?
407
What is the return type of indexOf(String substring) method of java.lang.String class in java?
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What is the return type of indexOf(String substring, int fromIndex) method of java.lang.String class in java?
409
What is the return type of toLowerCase() method of java.lang.String class in java?
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What is the return type of toLowerCase(Locale l) method of java.lang.String class in java?
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What is the return type of toUpperCase() method of java.lang.String class in java?
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What is the return type of toUpperCase(Locale l) method of java.lang.String class in java?
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Which exception does charAt() method of string throws in java?
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When will charAt(int index) method throws "IndexOutOfBoundsException" in java?
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What is the return type of compareTo(String anotherString) method of java.lang.String class in java?
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What are the various values return by compareTo(String anotherString) method of string in java?
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When will compareTo(String anotherString) method of string returns positive number in java?
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When will compareTo(String anotherString) method of string returns negative number in java?
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When will compareTo(String anotherString) method of string returns zero in java?
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Which exception does contains(CharSequence sequence) method of string throws in java?
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When will contains(CharSequence sequence) method throws "NullPointerException" in java?
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When will contains(CharSequence sequence) method of string returns true in java?
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When will contains(CharSequence sequence) method of string returns false in java?
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What the function of endsWith(String suffix) method of String class in java?
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What is the return type of endsWith(String suffix) method of java.lang.String class in java?
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When will equals(Object anotherObject) method of string returns true in java?
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When will equals(Object anotherObject) method of string returns false in java?
428
What the function of getBytes() method of String class in java?
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What is the return type of getBytes() method of java.lang.String class in java?
430
Which exception does getBytes(String charsetName) method of string throws in java?
431
From which version isEmpty() method of String class is available in java?
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When will isEmpty() method of string returns true in java?
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When will isEmpty() method of string returns false in java?
434
What the function of lastIndexOf(int ch) method of String class in java?
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What the function of lastIndexOf(int ch, int fromIndex) method of String class in java?
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What the function of lastIndexOf(String substring) method of String class in java?
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What the function of lastIndexOf(String substring, int fromIndex) method of String class in java?
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What is the return type of lastIndexOf(int ch) method of java.lang.String class in java?
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What is the return type of lastIndexOf(int ch, int fromIndex) method of java.lang.String class in java?
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What is the return type of lastIndexOf(String substring) method of java.lang.String class in java?
441
What is the return type of lastIndexOf(String substring, int fromIndex) method of java.lang.String class in java?
442
Which method is called by String.format(Locale locale, String format, Object... args) method when you do not specify the locale parameter?