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Core Java

Core Java Core java is Object oriented language which is known to be the preeminent language of the Internet and this section provides you with various Interview questions on core java like on casting, abstract method, subclasses, threads, packages, etc

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When is an object subject to garbage Sonali	05-07-2009 03:35 PM by renurawats	3	602
Either java is pure oop or partial oop? farook_ahammad	03-20-2009 07:02 PM by anipk2007@gmail.com	4	662
Does a class inherit the constructors Sonali	02-08-2009 05:03 PM by vamshikrishna_punna	5	658
What must a class do to implement Sonali	11-14-2008 05:32 PM by deore.pramod	3	712
Why are the methods of the Math Sonali	11-12-2008 06:52 AM by pkpiyushkumarpk	3	489
If a class is declared without any access modifiers Sonali	11-02-2008 05:14 PM by deore.pramod	2	582
What is the difference between the String Sonali	10-10-2008 11:18 AM by chaitanya.shashi	2	689
Is null a keyword Sonali	10-10-2008 11:14 AM by chaitanya.shashi	5	714
To what value is a variable of the boolean Sonali	10-10-2008 11:12 AM by chaitanya.shashi	4	554
What is the difference between a break statement and a continue statement? Virus	09-08-2008 03:58 PM by gopi_may9	3	461
exception handeling kumar2me	09-03-2008 11:01 PM by kumar2me	0	275
When do we declare a method or class abstract? kundan	09-02-2008 07:10 PM by sonarsanju	4	380
Can an object's finalize() method be invoked Sonali	08-24-2008 12:33 PM by arshadal_i	2	957
What is a Java package and how Sonali	07-13-2008 09:06 PM by rajaforyou111	2	511
What is the Locale class Sonali	06-28-2008 11:53 PM by pradha	1	383
If a method is declared as protected, where Sonali	06-28-2008 11:39 PM by pradha	2	365
If a variable is declared as private, where Sonali	06-12-2008 10:24 AM by meesala srinivas	2	382
Which containers use a border Layout as Sonali	06-09-2008 01:21 PM by thegame	4	500
When does the compiler supply a default Sonali	06-08-2008 10:43 AM by singam_sree	2	471
what is use of Finalizer method? kundan	06-05-2008 01:35 AM by kundan	0	297
What is the purpose of garbage collection? Virus	06-05-2008 01:03 AM by kundan	1	240
What is a transient variable Sonali	06-05-2008 12:34 AM by kundan	2	538
What is the Map interface Sonali	06-05-2008 12:11 AM by kundankk_2	2	336
Which TextComponent method is used to set Sonali	02-12-2008 01:53 AM by thegame	1	269
What is the range of the Sonali	02-12-2008 01:51 AM by thegame	1	304
What are the two basic ways in which classes Sonali	02-12-2008 01:48 AM by thegame	1	401
What is the difference between a public Sonali	02-12-2008 01:38 AM by thegame	1	222
Which package is always imported Sonali	02-12-2008 01:32 AM by thegame	1	246
What restrictions are placed on the location Sonali	02-12-2008 01:28 AM by thegame	1	202
What method is used to specify a Sonali	02-12-2008 01:24 AM by thegame	1	192
Which characters may be used as the second Sonali	02-12-2008 01:23 AM by thegame	1	167
What is an Iterator interface Sonali	02-12-2008 01:20 AM by thegame	1	208
What is the return type of a program's Sonali	02-12-2008 01:19 AM by thegame	1	174
What is the argument type of a Sonali	02-12-2008 01:19 AM by thegame	1	147
What is the difference between a while Sonali	02-12-2008 01:18 AM by thegame	1	140
Which containers use a FlowLayout as Sonali	02-12-2008 01:17 AM by thegame	1	133
What restrictions are placed on method Sonali	02-12-2008 01:16 AM by thegame	1	152
When a thread blocks on I/O, what state Sonali	02-12-2008 01:10 AM by thegame	1	177
Name two subclasses of the TextComponent Sonali	02-12-2008 01:09 AM by thegame	1	128
How are Java source code files Sonali	02-12-2008 01:08 AM by thegame	1	145
Can an abstract class be Sonali	02-12-2008 01:04 AM by thegame	1	138
Which class is extended by all other Sonali	02-12-2008 12:53 AM by thegame	1	130
What is the range of the char Sonali	02-12-2008 12:50 AM by thegame	2	133
Is a class a subclass of Sonali	02-12-2008 12:48 AM by thegame	2	140
What is the Set interface Sonali	02-10-2008 04:03 AM by mithun.saxena	3	208
What is a layout manager Sonali	01-10-2008 05:13 PM by rahib	1	170
Can a double value be cast to Sonali	01-10-2008 04:55 PM by rahib	1	157
Is &&= a valid Java operator Sonali	01-10-2008 04:40 PM by rahib	1	135
Name the eight primitive Java Sonali	01-10-2008 04:17 PM by rahib	1	203
Is "abc" a primitive value Sonali	01-10-2008 04:12 PM by rahib	1	156
Are true and false keywords Sonali	01-10-2008 04:06 PM by rahib	2	165
What is the % operator Sonali	01-10-2008 04:02 PM by rahib	1	133
What is the Dictionary class Sonali	01-10-2008 03:55 PM by rahib	1	127
What is an abstract method Sonali	01-10-2008 03:50 PM by rahib	1	147
The Java source code can be created in Sonali	01-10-2008 11:39 AM by rahib	4	139
What is an Iterator interface? Virus	01-04-2008 09:40 PM by Virus	0	369
What is the relationship between the Canvas class and the Graphics class? Virus	01-04-2008 09:40 PM by Virus	0	216
Which class should you use to obtain design information about an object? Virus	01-04-2008 09:39 PM by Virus	0	235
What is the purpose of the finally clause of a try-catch-finally statement? Virus	01-04-2008 09:39 PM by Virus	0	233
What methods are used to get and set the text label displayed by a Button object? Virus	01-04-2008 09:38 PM by Virus	0	160
What is the difference between a field variable and a local variable? Virus	01-04-2008 09:38 PM by Virus	0	241
To what value is a variable of the String type automatically initialized? Virus	01-04-2008 09:38 PM by Virus	0	161
What Checkbox method allows you to tell if a Checkbox is checked? Virus	01-04-2008 09:37 PM by Virus	0	147
If a variable is declared as private, where may the variable be accessed? Virus	01-04-2008 09:37 PM by Virus	0	158
What classes of exceptions may be thrown by a throw statement? Virus	01-04-2008 09:37 PM by Virus	0	162
What are wrapped classes? Virus	01-04-2008 09:36 PM by Virus	0	217
What is the catch or declare rule for method declarations? Virus	01-04-2008 09:36 PM by Virus	0	155
What happens when a thread cannot acquire a lock on an object? Virus	01-04-2008 09:36 PM by Virus	0	184
To what value is a variable of the Boolean type automatically initialized? Virus	01-04-2008 09:35 PM by Virus	0	147
What modifiers may be used with an interface declaration? Virus	01-04-2008 09:35 PM by Virus	0	146
What is the difference between the paint() and repaint() methods? Virus	01-04-2008 09:34 PM by Virus	0	325
What is the argument type of a program’s main() method? Virus	01-04-2008 09:33 PM by Virus	0	138
What's new with the stop (), suspend () and resume () methods in JDK 1.2? Virus	01-04-2008 09:33 PM by Virus	0	99
What happens when you add a double value to a String? Virus	01-04-2008 09:32 PM by Virus	0	221
Which arithmetic operations can result in the throwing of an ArithmeticException? Virus	01-04-2008 09:32 PM by Virus	0	109
What classes of exceptions may be caught by a catch clause? Virus	01-04-2008 09:31 PM by Virus	0	110
What is the difference between static and non-static variables? Virus	01-04-2008 09:31 PM by Virus	0	104
Name two subclasses of the TextComponent class. Virus	01-04-2008 09:30 PM by Virus	0	129
What is the difference between a Window and a Frame? Virus	01-04-2008 09:29 PM by Virus	0	85
What is the relationship between clipping and repainting? Virus	01-04-2008 09:28 PM by Virus	0	84
What happens when you invoke a thread's interrupt method while it is sleeping or wait Virus	01-04-2008 09:28 PM by Virus	0	72
Which package is always imported by default? Virus	01-04-2008 09:27 PM by Virus	0	87
What is the difference between the prefix and postfix forms of the ++ operator? Virus	01-04-2008 09:27 PM by Virus	0	103
What are E and PI? Virus	01-04-2008 09:27 PM by Virus	0	83
Which non-Unicode letter characters may be used as the first character of an identifi Virus	01-04-2008 09:27 PM by Virus	0	77
What event results from the clicking of a button? Virus	01-04-2008 09:26 PM by Virus	0	88
For which statements does it make sense to use a label? Virus	01-04-2008 09:26 PM by Virus	0	81
What is an abstract method? Virus	01-04-2008 09:26 PM by Virus	0	113
Which Container method is used to cause a container to be laid out and redisplayed? Virus	01-04-2008 09:25 PM by Virus	0	68
Name three Component subclasses that support painting. Virus	01-04-2008 09:24 PM by Virus	0	88
What is synchronization and why is it important? Virus	01-04-2008 09:24 PM by Virus	0	99
Which characters may be used as the second character of an identifier, but not as the Virus	01-04-2008 09:23 PM by Virus	0	86
What is a native method? Virus	01-04-2008 09:23 PM by Virus	0	93
Which class is the immediate superclass of the MenuComponent class? Virus	01-04-2008 09:23 PM by Virus	0	70
Can a double value be cast to a byte? Virus	01-04-2008 09:22 PM by Virus	0	92
What is an object's lock and which objects have locks? Virus	01-04-2008 09:22 PM by Virus	0	72
Does a class inherit the constructors of its superclass? Virus	01-04-2008 09:22 PM by Virus	0	71
What advantage do Java's layout managers provide over traditional windowing systems? Virus	01-04-2008 09:21 PM by Virus	0	61
When does the compiler supply a default constructor for a class? Virus	01-04-2008 09:21 PM by Virus	0	73
If an object is garbage collected, can it become reachable again? Virus	01-04-2008 09:20 PM by Virus	0	83
What is the ResourceBundle class? Virus	01-04-2008 09:20 PM by Virus	0	66
How are Observer and Observable used? Virus	01-04-2008 09:19 PM by Virus	0	69
What is the Collections API? Virus	01-04-2008 09:19 PM by Virus	0	76
What is the immediate superclass of the Dialog class? Virus	01-04-2008 09:18 PM by Virus	0	79
What is the difference between the Boolean ‘&’ operator and the ‘&&’ operator? Virus	01-04-2008 09:18 PM by Virus	0	78
What method is invoked to cause an object to begin executing as a separate thread? Virus	01-04-2008 09:17 PM by Virus	0	80
What is the difference between a static and a non-static inner class? Virus	01-04-2008 09:17 PM by Virus	0	69
Can an object be garbage collected while it is still reachable? Virus	01-04-2008 09:17 PM by Virus	0	88
How are the elements of a CardLayout organized? Virus	01-04-2008 09:16 PM by Virus	0	64
What is the difference between a while statement and a do statement? Virus	01-04-2008 09:16 PM by Virus	0	88
Which Math method is used to calculate the absolute value of a number? Virus	01-04-2008 09:16 PM by Virus	0	71
What is the difference between a Choice and a List? Virus	01-04-2008 09:15 PM by Virus	0	74
How is it possible for two String objects with identical values not to be equal under Virus	01-04-2008 09:15 PM by Virus	0	78
What is your platform's default character encoding? Virus	01-04-2008 09:14 PM by Virus	0	84
Can an abstract class be final? Virus	01-04-2008 09:14 PM by Virus	0	64
What are the problems faced by Java programmers who don't use layout managers? Virus	01-04-2008 09:14 PM by Virus	0	95
What restrictions are placed on method overriding? Virus	01-04-2008 09:14 PM by Virus	0	91
What is the difference between the File and RandomAccessFile classes? Virus	01-04-2008 09:13 PM by Virus	0	73
When is the finally clause of a try-catch-finally statement executed? Virus	01-04-2008 09:13 PM by Virus	0	66
What is the Collection interface? Virus	01-04-2008 09:13 PM by Virus	0	75
Is a class a subclass of itself? Virus	01-04-2008 09:12 PM by Virus	0	62
Name the eight primitive Java types. Virus	01-04-2008 09:12 PM by Virus	0	61
How is rounding performed under integer division? Virus	01-04-2008 09:12 PM by Virus	0	85
How are the elements of a BorderLayout organized? Virus	01-04-2008 09:11 PM by Virus	0	52
What value does read() return when it has reached the end of a file? Virus	01-04-2008 09:11 PM by Virus	0	58
Which Java operator is right associative? Virus	01-04-2008 09:11 PM by Virus	0	60
How many times may an object's finalize () method be invoked by the garbage collector Virus	01-04-2008 09:10 PM by Virus	0	74
What is the range of the short type? Virus	01-04-2008 09:10 PM by Virus	0	64
What is the range of the char type? Virus	01-04-2008 09:10 PM by Virus	0	62
Can an anonymous class be declared as implementing an interface and extending a class Virus	01-04-2008 09:09 PM by Virus	0	94
What is clipping? Virus	01-04-2008 09:09 PM by Virus	0	61
Does garbage collection guarantee that a program will not run out of memory? Virus	01-04-2008 09:08 PM by Virus	0	70
How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8 characters? Virus	01-04-2008 09:07 PM by Virus	0	58
What is the List interface? Virus	01-04-2008 09:07 PM by Virus	0	64
What method is used to specify a container's layout? Virus	01-04-2008 09:06 PM by Virus	0	57
Which containers use a border Layout as their default layout? Virus	01-04-2008 09:06 PM by Virus	0	58
Can a lock be acquired on a class? Virus	01-04-2008 09:06 PM by Virus	0	97
What state does a thread enter when it terminates its processing? Virus	01-04-2008 09:05 PM by Virus	0	79
What modifiers may be used with an inner class that is a member of an outer class? Virus	01-04-2008 09:05 PM by Virus	0	80
Which java.util classes and interfaces support event handling? Virus	01-04-2008 09:05 PM by Virus	0	68
What is the immediate superclass of the Applet class? Virus	01-04-2008 09:04 PM by Virus	0	69
What value does readLine() return when it has reached the end of a file? Virus	01-04-2008 09:04 PM by Virus	0	49
When a thread blocks on I/O, what state does it enter? Virus	01-04-2008 09:04 PM by Virus	0	78
When a thread is created and started, what is its initial state? Virus	01-04-2008 09:03 PM by Virus	0	66
In which package are most of the AWT events that support the event-delegation model d Virus	01-04-2008 09:03 PM by Virus	0	55
What is the GregorianCalendar class? Virus	01-04-2008 09:02 PM by Virus	0	109
What is the purpose of the wait(), notify(), and notifyAll() methods? Virus	01-04-2008 09:01 PM by Virus	0	169
What are the high-level thread states? Virus	01-04-2008 09:00 PM by Virus	0	161
Which class is extended by all other classes? Virus	01-04-2008 08:59 PM by Virus	0	57
What is the difference between the Reader/Writer class hierarchy and the InputStream/ Virus	01-04-2008 08:59 PM by Virus	0	65
What is the SimpleTimeZone class? Virus	01-04-2008 08:58 PM by Virus	0	51
What is the purpose of the System class? Virus	01-04-2008 08:58 PM by Virus	0	67
What is the relationship between an event-listener interface and an event-adapter cla Virus	01-04-2008 08:58 PM by Virus	0	92
How are the elements of a GridBagLayout organized? Virus	01-04-2008 08:57 PM by Virus	0	57
What modifiers can be used with a local inner class? Virus	01-04-2008 08:57 PM by Virus	0	65
How does multithreading take place on a computer with a single CPU? Virus	01-04-2008 08:57 PM by Virus	0	53
If a method is declared as protected, where may the method is accessed? Virus	01-04-2008 08:56 PM by Virus	0	73
What restrictions are placed on method overloading? Virus	01-04-2008 08:56 PM by Virus	0	61
What is the return type of a program's main() method? Virus	01-04-2008 08:55 PM by Virus	0	61
Under what conditions is an object's finalize () method invoked by the garbage collec Virus	01-04-2008 08:55 PM by Virus	0	51
What are the legal operands of the instanceof operator? Virus	01-04-2008 08:55 PM by Virus	0	48
What is the purpose of the enableEvents() method? Virus	01-04-2008 08:54 PM by Virus	0	49
How are this and super used? Virus	01-04-2008 08:54 PM by Virus	0	54
What happens if an exception is not caught? Virus	01-04-2008 08:54 PM by Virus	0	80
What is numeric promotion? Virus	01-04-2008 08:53 PM by Virus	0	73
What is the purpose of a statement block? Virus	01-04-2008 08:53 PM by Virus	0	63
What is the List interface? Virus	01-04-2008 08:53 PM by Virus	0	50
What class allows you to read objects directly from a stream? Virus	01-04-2008 08:51 PM by Virus	0	87
What is the difference between the JDK 1.02 event model and the event-delegation mode Virus	01-04-2008 08:51 PM by Virus	0	50
How are the elements of a GridLayout organized? Virus	01-04-2008 08:50 PM by Virus	0	60
What is a void return type? Virus	01-04-2008 08:49 PM by Virus	0	103
What is a compilation unit? Virus	01-04-2008 08:49 PM by Virus	0	59
What is a layout manager? Virus	01-04-2008 08:48 PM by Virus	0	54
What happens if a try-catch-finally statement does not have a catch clause to handle Virus	01-04-2008 08:48 PM by Virus	0	76
Can try statements be tested? Virus	01-04-2008 08:48 PM by Virus	0	61
What modifiers may be used with a top-level class? Virus	01-04-2008 08:47 PM by Virus	0	63
What is the difference between an if statement and a switch statement? Virus	01-04-2008 08:47 PM by Virus	0	114
What is the difference between a Scrollbar and a ScrollPane? Virus	01-04-2008 08:47 PM by Virus	0	89
How can a dead thread be restarted? Virus	01-04-2008 08:46 PM by Virus	0	52
What interface must an object implement before it can be written to a stream as an ob Virus	01-04-2008 08:46 PM by Virus	0	49
Are true and false keywords? Virus	01-04-2008 08:45 PM by Virus	0	77
What an I/O filter? Virus	01-04-2008 08:45 PM by Virus	0	55
Why are the methods of the Math class static? Virus	01-04-2008 08:45 PM by Virus	0	62
What is the relationship between a method's throws clause and the exceptions that can Virus	01-04-2008 08:44 PM by Virus	0	53
What class of exceptions is generated by the Java run-time system? Virus	01-04-2008 08:44 PM by Virus	0	53
What is casting? Virus	01-04-2008 08:44 PM by Virus	0	52
How can the Checkbox class be used to create a radio button? Virus	01-04-2008 08:43 PM by Virus	0	49
Can an exception be rethrown? Virus	01-04-2008 08:43 PM by Virus	0	64
What is the highest-level event class of the event-delegation model? Virus	01-04-2008 08:43 PM by Virus	0	123
What restrictions are placed on the values of each case of a switch statement? Virus	01-04-2008 08:42 PM by Virus	0	69
Which TextComponent method is used to set a TextComponent to the read-only state? Virus	01-04-2008 08:42 PM by Virus	0	47
If a class is declared without any access modifiers, where may the class be accessed? Virus	01-04-2008 08:41 PM by Virus	0	89
Is the ternary operator written x : y ? z or x ? y : z ? Virus	01-04-2008 08:41 PM by Virus	0	85
When can an object reference be cast to an interface reference? Virus	01-04-2008 08:40 PM by Virus	0	58
What is the difference between the String and StringBuffer classes? Virus	01-04-2008 08:40 PM by Virus	0	59
How are Java source code files named? Virus	01-04-2008 08:40 PM by Virus	0	71
What is the advantage of the event-delegation model over the earlier event-inheritanc Virus	01-04-2008 08:39 PM by Virus	0	73
What must a class do to implement an interface? Virus	01-04-2008 08:39 PM by Virus	0	50
What is the purpose of finalization? Virus	01-04-2008 08:38 PM by Virus	0	47
What is a task's priority and how is it used in scheduling? Virus	01-04-2008 08:38 PM by Virus	0	81

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