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Which of the following are primitive types?
A) byteB) StringC) integerD) float
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Which of the following features are common to both Java & C++? (Select multiple)
A) The class declarationB) The access modifiersC) The encapsulation of data & methods with in objectsD) The use of pointers
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Which of the following statements correctly describes an interface?
A) It's a concrete classB) It's a superclassC) It's a type of abstract class
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An applet is downloaded on demand
A) TrueB) False
Arnab.infinity
- Mar 19th, 2008
Falsebecuse its the browser which download the applet program over the internet,so it is not up to the user
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Java enables the creation of cross-platform programs by compiling into an intermediate representation called Java ____________
A) Byte CodeB) FirewallC) Tetra CodeD) View Code
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Through the use of inheritance, programmers can reuse the code in the superclass many times.
Skill/Topic: InheritanceA) TrueB) False
Govind Kansara
- May 21st, 2009
Yes, It's true.Through the use of inheritance, programmers can reuse the code in the superclass many times in there Program.
jananianandan
- Feb 20th, 2007
The inheriting helps the programmer to use the variables and methods without rewriting code for them,A child class can use the parents member variables and functions with the help of inheritance.So it is true
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What is the jdbc and odbc?what is the difference between jar files and bat files
prashant kumar
- Sep 11th, 2016
Clearly explained!! Thank you very much Sir.
speakup87
- Jan 14th, 2009
JDBC: Java Database Connectivity (JDBC) provides Java developers with a standard API (application Programming Interfaces) that is used to access databases, regardless of the driver and database pr...
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What is the garbage collection?
sankris
- Mar 23rd, 2006
In computer science, garbage collection (also known as GC) is a form of automatic memory management. The garbage collector or collector attempts to reclaim garbage, or memory used by objects that will never again be accessed or mutated by the application
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What is the difference between Applet and japplet?What are the traverses in binary tree? Write down how will you create a Binary tree? What is constructor and virtual function? Can we call a virtual function in a constructor? give example.
rizwan
- Oct 23rd, 2011
Muthukrishnan ...
i think Applet is a super class and JApplet is a sub class ..!
Rizwan ..!rohit dwivedi9450
- Jul 28th, 2007
Applet is a smart program which compile on the server and runs on our console.
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How come hashcodes can be the same even if objects aren't equal?
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Public class A {int x; public static void main(String args[]) {x=x+1;s.o.p(x);}}what is the output? a) compile time errorb) runtime error
sekhar511
- Dec 10th, 2010
A non-static variable cannot be referenced as a static contextHence "x" is a non-static variable....
satyanarayana
- Aug 14th, 2007
Compile time errorIn that program int x is an nonstatic variable we can't call directly with static method
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How to connect to database through java without creating dsn?
Ashique
- Aug 13th, 2008
Steps Includes:1. Get the URL where the database is exist, get the user name and the password.2. Register the proper database driver.3. Get database connection using DriverManager with the above infor...
vini.rana
- Aug 12th, 2008
We have four types of driverstype1, type2, type3, type4 and we use JDBC and ODBC.We can connect the database b/w two computers using type 3 and 4 drivers. Type 3 and 4 directly calls the native metho...
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Whic is the base class in java, and how it be will the base class
vmshenoy
- Jan 10th, 2007
See the base class(super class) of all classes is Object class.Other wise when u creat a class ,and if that class is inherited by other one, then former one is the base class.bye
abhijith
- Dec 28th, 2006
For a class whichever class you extend becomes its base class..For eg:class SubClass extends BaseClass{}If your class doesn't explicitly "extends" any class then JVM makes Object class as the base cla...
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}
}
public class test1 extends test
{
public void say()
{
super.hello();
hello();
}
public void main(String arg[])
{
test1 t = new test1();
t.say();
}
}
In the above code what will be difference of super.hello(); and hello();. What is use of super instead of calling directly method name.
">Public class test{ public void hello() { System.out.println("Helllo"); }}public class test1 extends test{ public void say(){ super.hello(); hello();}public void main(String arg[]){ test1 t = new test1(); t.say();}}In the above code what will be difference of super.hello(); and hello();. What is use of super instead of calling directly method name.
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Which is the most convient way to create a thread and Why?1) Extends from thread or2) Implements from Runnable Interface.
nkkaushik
- Jan 5th, 2011
Impelementing the Runnable Interface gives a better way to create a Thread because by doing so, you can also extend any other class.
deepthis594
- Dec 27th, 2010
Implementing runnable is the most efficient way to create thread because classes should be extended only when they are being enhanced or modified in some way, while implementing runnable it is only required to override run method.
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Why getInstance() method is used along with class declaration in Java?
komalnk
- Mar 1st, 2016
This is mainly used when there is need of creating an instance of the class.but, when the constructor of class is declared as private. (We cannot create object of object of such class, even inheritance is not possible). So, we use getInstance() method.
sunilbrahmajosyula
- Jan 5th, 2016
It mainly used in singleton class. In the singleton class we will be creating only one object. Where as this getInstance(); will make sure that there is only one copy of an Instance i.e.,copy of an object and returns the single object
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Run Time Exceptions
What do exception mean in java ? what type of run time exceptions?
sanjusr25
- Jun 13th, 2009
Exception means an unwanted condition occur during the excecution of a program.Exception are of two type 1) Checked Exception2) Unchecked Exception Checked exception are those exception which can be...
ranaraj
- Dec 3rd, 2008
List of error exceptions are1).arithmetic Exception2).arrayindexoutofbounds?Exception3).arraystore?Exception4).filenotfoundException 5).ioException6).nullpointerException7).numberformatException8).outofmemoryException9).securityException10).stackoverflowException11).stringindexoutofboundsException
Java Interview Questions
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