Question 1)

What will happen when you attempt to compile and run this code?

abstract class Base{
abstract public void myfunc();
public void another(){
System.out.println("Another method");
}
}

public class Abs extends Base{
public static void main(String argv[]){
Abs a = new Abs();
a.amethod();
}
public void myfunc(){
System.out.println("My Func");
} 
public void amethod(){
myfunc();      
}
}

1) The code will compile and run, printing out the words "My Func"
2) The
compiler will complain that the Base class has non abstract methods
3) The
code will compile but complain at run time that the Base class has non abstract
methods
4) The compiler will complain that the method myfunc in the base
class has no body, nobody at all to looove it

Answer to
Question 1

Question 2)

What will happen when you attempt to compile and run this code?

public class MyMain{
public static void main(String argv){
System.out.println("Hello cruel world");
}
}

1) The compiler will complain that main is a reserved word and cannot be used
for a class
2) The code will compile and when run will print out "Hello cruel
world"
3) The code will compile but will complain at run time that no
constructor is defined
4) The code will compile but will complain at run time
that main is not correctly defined

Answer to
Question 2

Question 3)

Which of the following are Java modifiers?

1) public
2)
private
3) friendly
4) transient
5) vagrant

Answer to Question
3

Question 4)

What will happen when you attempt to compile and run this code?

class Base{
abstract public void myfunc();
public void another(){
System.out.println("Another method");
}
}

public class Abs extends Base{
public static void main(String argv[]){
Abs a = new Abs();
a.amethod();
}

public void myfunc(){
System.out.println("My func");
} 

public void amethod(){
myfunc();
}
}

1) The code will compile and run, printing out the words "My Func"
2) The
compiler will complain that the Base class is not declared as abstract.
3)
The code will compile but complain at run time that the Base class has non
abstract methods
4) The compiler will complain that the method myfunc in the
base class has no body, nobody at all to looove it

Answer to
Question 4

Question 5)

Why might you define a method as native?

1) To get to access hardware that Java does not know about
2) To define a
new data type such as an unsigned integer
3) To write optimised code for
performance in a language such as C/C++
4) To overcome the limitation of the
private scope of a method

Answer to
Question 5

Question 6)

What will happen when you attempt to compile and run this code?

class Base{
public final void amethod(){
System.out.println("amethod");
}
}

public class Fin extends Base{
public static void main(String argv[]){
Base b = new Base();
b.amethod();
}
}

1) Compile time error indicating that a class with any final methods must be
declared final itself
2) Compile time error indicating that you cannot
inherit from a class with final methods
3) Run time error indicating that
Base is not defined as final
4) Success in compilation and output of
"amethod" at run time.

Answer to Question
6

Question 7)

What will happen when you attempt to compile and run this code?

public class Mod{
public static void main(String argv[]){
}
public static native void amethod();

}

1) Error at compilation: native method cannot be static
2) Error at
compilation native method must return value
3) Compilation but error at run
time unless you have made code containing native amethod available
4)
Compilation and execution without error

Answer to
Question 7

Question 8)

What will happen when you attempt to compile and run this code?

private class Base{}
public class Vis{
transient int  iVal;
public static void main(String elephant[]){
}
}

1)Compile time error: Base cannot be private
2)Compile time error
indicating that an integer cannot be transient
3)Compile time error transient
not a data type
4)Compile time error malformed main method

Answer to
Question 8

Question 9)

What happens when you attempt to compile and run these two files in the same
directory?

//File P1.java
package MyPackage;
class P1{
void afancymethod(){
System.out.println("What a fancy method");
}
}
//File P2.java
public class P2 extends P1{
public static void main(String argv[]){
P2 p2 = new P2();
p2.afancymethod();
}
}

1) Both compile and P2 outputs "What a fancy method" when run
2) Neither
will compile
3) Both compile but P2 has an error at run time
4) P1
compiles cleanly but P2 has an error at compile time

Answer to Question
9

Question 10)

You want to find out the value of the last element of an array. You write the
following code. What will happen when you compile and run it.?

public class MyAr{
public static void main(String argv[]){
int[] i = new int[5];
System.out.println(i[5]);
}
}

1) An error at compile time
2) An error at run time
3) The value 0 will
be output
4) The string "null" will be output

Answer to
Question 10

Question 11)

You want to loop through an array and stop when you come to the last element.
Being a good java programmer and forgetting everything you ever knew about C/C++
you know that arrays contain information about their size. Which of the
following can you
use?

1)myarray.length();
2)myarray.length;
3)myarray.size
4)myarray.size();

Answer to
Question 11

Question 12)

What best describes the appearance of an application with the following
code?

import java.awt.*;
public class FlowAp extends Frame{
public static void main(String argv[]){
FlowAp fa=new FlowAp();
fa.setSize(400,300);
fa.setVisible(true);

}

FlowAp(){
add(new Button("One"));
add(new Button("Two"));
add(new Button("Three"));
add(new Button("Four"));
}//End of constructor



}//End of Application

1) A Frame with buttons marked One to Four placed on each edge.
2) A Frame
with buutons marked One to four running from the top to bottom
3) A Frame
with one large button marked Four in the Centre
4) An Error at run time
indicating you have not set a LayoutManager

Answer to
Question 12

Question 13)

How do you indicate where a component will be positioned using
Flowlayout?

1) North, South,East,West
2) Assign a row/column grid reference
3) Pass
a X/Y percentage parameter to the add method
4) Do nothing, the FlowLayout
will position the component

Answer to
Question 13)

Question 14)

How do you change the current layout manager for a container

1) Use the setLayout method
2) Once created you cannot change the current
layout manager of a component
3) Use the setLayoutManager method
4) Use
the updateLayout method

Answer to
Question 14)

Question 15)

Which of the following are fields of the GridBagConstraints class?

1) ipadx
2) fill
3) insets
4) width

Answer to
Question 15)

Question 16)

What most closely matches the appearance when this code runs?

import java.awt.*;
public class CompLay extends Frame{
public static void main(String argv[]){
CompLay cl = new CompLay();
}

CompLay(){
Panel p = new Panel();
p.setBackground(Color.pink);
p.add(new Button("One"));
p.add(new Button("Two"));
p.add(new Button("Three"));
add("South",p);
setLayout(new FlowLayout());
setSize(300,300);
setVisible(true);
}
}

1) The buttons will run from left to right along the bottom of the
Frame
2) The buttons will run from left to right along the top of the
frame
3) The buttons will not be displayed
4) Only button three will show
occupying all of the frame

Answer to
Question 16)

Question 17)

Which statements are correct about the anchor field?

1) It is a field of the GridBagLayout manager for controlling component
placement
2) It is a field of the GridBagConstraints class for controlling
component placement
3) A valid setting for the anchor field is
GridBagConstraints.NORTH
4) The anchor field controls the height of
components added to a container

Answer to
Question 17)

Question 18)

What will happen when you attempt to compile and run the following code?

public class Bground extends Thread{
public static void main(String argv[]){
Bground b = new Bground();
b.run();
}
public void start(){
for (int i = 0; i <10; i++){
System.out.println("Value of i = " + i);
}
}
}

1) A compile time error indicating that no run method is defined for the
Thread class
2) A run time error indicating that no run method is defined for
the Thread class
3) Clean compile and at run time the values 0 to 9 are
printed out
4) Clean compile but no output at runtime

Answer to
Question 18)

Question 19)

Is the following statement true or false?
When using the GridBagLayout
manager, each new component requires a new instance of the GridBagConstraints
class.

1) true
2) false

Answer to
Question 19)

Question 20)

Which most closely matches a description of a Java Map?

1) A vector of arrays for a 2D geographic representation
2) A class for
containing unique array elements
3) A class for containing unique vector
elements
4) An interface that ensures that implementing classes cannot
contain duplicate keys

Answer to
Question 20)

Question 21)

How does the set collection deal with duplicate elements?

1) An exception is thrown if you attempt to add an element with a duplicate
value
2) The add method returns false if you attempt to add an element
with a duplicate value
3) A set may contain elements that return duplicate
values from a call to the equals method
4) Duplicate values will cause an
error at compile time

Answer to
Question 21)

Question 22)

What can cause a thread to stop executing?

1) The program exits via a call to System.exit(0);
2) Another thread is
given a higher priority
3) A call to the thread's stop method.
4) A call
to the halt method of the Thread class?

Answer to
Question 22)

Question 23)

For a class defined inside a method, what rule governs access to the
variables of the enclosing method?

1) The class can access any variable
2) The class can only access static
variables
3) The class can only access transient variables
4) The class
can only access final variables

Answer to Question
23)

Question 24)

Under what circumstances might you use the yield method of the Thread
class

1) To call from the currently running thread to allow another thread of the
same or higher priority to run
2) To call on a waiting thread to allow it to
run
3) To allow a thread of higher priority to run
4) To call from the
currently running thread with a parameter designating which thread should be
allowed to run

Answer to Question
24)

Question 25)

What will happen when you attempt to compile and run the following code

public class Hope{
public static void main(String argv[]){
Hope h = new Hope();
}

protected Hope(){
for(int i =0; i <10; i ++){
System.out.println(i);
}
}
}

1) Compilation error: Constructors cannot be declared protected
2) Run
time error: Constructors cannot be declared protected
3) Compilation and
running with output 0 to 10
4) Compilation and running with output 0 to 9

Answer to Question
25)

Question 26)

What will happen when you attempt to compile and run the following code

public class MySwitch{
public static void main(String argv[]){
MySwitch ms= new MySwitch();
ms.amethod();
}


public void amethod(){
int k=10; 
switch(k){ 
default: //Put the default at the bottom, not here
System.out.println("This is the default output"); 
break; 
case 10: 
System.out.println("ten");
case 20: 
System.out.println("twenty"); 
break; 
}
}
}

1) None of these options
2) Compile time error target of switch must be an
integral type
3) Compile and run with output "This is the default
output"
4) Compile and run with output of the single line "ten"

Answer to
Question 26)

Question 27)

Which of the following is the correct syntax for suggesting that the JVM
performs garbage collection

1) System.free();
2) System.setGarbageCollection();
3)
System.out.gc();
4) System.gc();

Answer to
Question 27)

Question 28)

What will happen when you attempt to compile and run the following
code

public class As{
int i = 10;
int j;
char z= 1;
boolean b;
public static void main(String argv[]){
As a = new As();
a.amethod();
}
public void amethod(){
System.out.println(j);
System.out.println(b);                
}
}

1) Compilation succeeds and at run time an output of 0 and false
2)
Compilation succeeds and at run time an output of 0 and true
3) Compile time
error b is not initialised
4) Compile time error z must be assigned a char
value

Answer to
Question 28)

Question 29)

What will happen when you attempt to compile and run the following code
with the command line "hello there"

public class Arg{
String[] MyArg;
public static void main(String argv[]){
MyArg=argv;
}

public void amethod(){
System.out.println(argv[1]);
}
}

1) Compile time error
2) Compilation and output of "hello"
3)
Compilation and output of "there"
4) None of the above

Answer to
Question 29)

Question 30)

What will happen when you attempt to compile and run the following code

public class StrEq{
public static void main(String argv[]){
StrEq s = new StrEq();
}
private StrEq(){
String s = "Marcus";
String s2 = new String("Marcus");
if(s == s2){
System.out.println("we have a match");
}else{
System.out.println("Not equal");
}
}
}

1) Compile time error caused by private constructor
2) Output of "we have
a match"
3) Output of "Not equal"
4) Compile time error by attempting to
compare strings using ==

Answer to
Question 30)

Question 31)

What will happen when you attempt to compile and run the following code

import java.io.*;
class Base{
public void amethod()throws FileNotFoundException{}
}

public class ExcepDemo extends Base{
public static void main(String argv[]){
ExcepDemo e = new ExcepDemo();
}

public void amethod(){}
protected ExcepDemo(){
try{
DataInputStream din = new DataInputStream(System.in);
System.out.println("Pausing");
din.readByte();
System.out.println("Continuing");
this.amethod();
}catch(IOException ioe) {}

}
}

1) Compile time error caused by protected constructor
2) Compile time
error caused by amethod not declaring Exception
3) Runtime error
caused by amethod not declaring Exception
4) Compile and run with output of
"Pausing" and "Continuing" after a key is hit

Answer to Question
31)

Question 32)

What will happen when you attempt to compile and run this program

public class Outer{
public String name = "Outer";
public static void main(String argv[]){
Inner i = new Inner();
i.showName();
}//End of main
private class Inner{
String name =new String("Inner");
void showName(){
System.out.println(name);
}
}//End of Inner class
}

1) Compile and run with output of "Outer"
2) Compile and run with output
of "Inner"
3) Compile time error because Inner is declared as private
4)
Compile time error because of the line creating the instance of Inner

Answer to
Question to 32

Question 33)

What will happen when you attempt to compile and run this code

//Demonstration of event handling
import java.awt.*;
import java.awt.event.*;
public class MyWc extends Frame implements WindowListener{
public static void main(String argv[]){
MyWc mwc = new MyWc();
}
public void windowClosing(WindowEvent we){
System.exit(0);
}//End of windowClosing
public void  MyWc(){
setSize(300,300);
setVisible(true);
}
}//End of class

1) Error at compile time
2) Visible Frame created that that can be
closed
3) Compilation but no output at run time
4) Error at compile time
because of comment before import statements

Answer to
Question 33)

Question 34)

Which option most fully describes will happen when you attempt to compile and
run the following code

public class MyAr{
public static void main(String argv[]) {
MyAr m = new MyAr();
m.amethod();
}
public void amethod(){
static int i;
System.out.println(i);
}
}

1)
Compilation and output of the value 0
2) Compile time error because i has not
been initialized
3) Compilation and output of null
4) Compile time error

Answer to Question
34)

Question 35)

Which of the following will compile correctly

1) short myshort =
99S;
2) String name = 'Excellent tutorial Mr Green';
3) char c =
17c;
4)int z = 015;

Answer to
Question 35)

Question 36)

Which of the following are Java key
words
1)double
2)Switch
3)then
4)instanceof

Answer to
Question 36)

Question 37)

What
will be output by the following line?

System.out.println(Math.floor(-2.1));

1) -2
2) 2.0
3) -3
4) -3.0

Answer to
Question 37)

Question 38)

Given the following main method in a class called Cycle and a command line
of

java Cycle one two

what will be output?

public static void main(String bicycle[]){
System.out.println(bicycle[0]);
}

1) None of these options
2) cycle
3) one
4) two

Answer to
Question 38)

Question 39)

Which of the following statements are true?

1) At the root of the collection hierarchy is a class called Collection
2)
The collection interface contains a method called enumerator
3) The interator
method returns an instance of the Vector class
4) The Set interface is
designed for unique elements

Answer to
Question 39)

Question 40)

Which of the following statements are correct?

1) If multiple listeners are added to a component only events for the last
listener added will be processed
2) If multiple listeners are added to a
component the events will be processed for all but with no guarantee in the
order
3) Adding multiple listeners to a comnponent will cause a compile time
error
4) You may remove as well add listeners to a component.

Answer to
Question 40)

Question 41)

Given the following code

class Base{}
public class MyCast extends Base{
static boolean b1=false;
static int i = -1;
static double d = 10.1;
public static void main(String argv[]){
MyCast m = new MyCast();
Base b = new Base();
//Here
}
}

Which of the following, if inserted at the comment //Here will allow the code
to compile and run without error

1) b=m;
2) m=b;
3) d =i;
4) b1
=i;

Answer to
Question 41)

Question 42)

Which of the following statements about threading are true

1) You can only obtain a mutually exclusive lock on methods in a class that
extends Thread or implements runnable
2) You can obtain a mutually exclusive
lock on any object
3) A thread can obtain a mutually exclusive lock on an
object by calling a synchronized method on that object.
4) Thread scheduling
algorithms are platform dependent

Answer to
Question 42)

Question 43)

Your chief Software designer has shown you a sketch of the new Computer parts
system she is about to create. At the top of the hierarchy is a Class called
Computer and under this are two child classes. One is called LinuxPC and one is
called WindowsPC.

The main difference between the two is that one runs the Linux operating
System and the other runs the Windows System (of course another difference is
that one needs constant re-booting and the other runs reliably). Under the
WindowsPC are two Sub classes one called Server and one Called Workstation. How
might you appraise your designers work?

1) Give the goahead for further design using the current scheme
2) Ask
for a re-design of the hierarchy with changing the Operating System to a field
rather than Class type
3) Ask for the option of WindowsPC to be removed as it
will soon be obsolete
4) Change the hierarchy to remove the need for the
superfluous Computer Class.

Answer to
Question 43)

Question 44)

Which of the following statements are true

1) An inner class may be defined as static
2) There are NO circumstances
where an inner class may be defined as private
3) A programmer may only
provide one constructor for an anonymous class
4) An inner class may extend
another class

Answer to
Question 44)

Question 45)

What will happen when you attempt to compile and run the following code

int Output=10;
boolean b1 = false;
if((b1==true) && ((Output+=10)==20)){
System.out.println("We are equal "+Output);
}else
{
System.out.println("Not equal! "+Output);
}

1) Compile error, attempting to peform binary comparison on logical data
type
2) Compilation and output of "We are equal 10"
3) Compilation and
output of "Not equal! 20"
4) Compilation and output of "Not equal! 10"

Answer to
Question 45)

Question 46)

Given the following variables which of the following lines will compile
without error?

String s = "Hello";
long l = 99;
double d = 1.11;
int i = 1;
int j = 0;
1) j= i <<s;

2) j= i<<j;

3) j=i<<d;

4)j=i<<l;

Answer to Question
46)

Question 47)

What will be output by the following line of code?

System.out.println(010|4);

1) 14
2) 0
3) 6
4) 12

Answer to Question
47)

Question 48)

Given the following variables

char c = 'c';
int i = 10;
double d = 10;
long l = 1;
String s = "Hello";

Which of the following will compile without error?

1)c=c+i;
2)s+=i;
3)i+=s;
4)c+=s;

Answer to Question
48)

Question 49)

Which of the following will compile without error?

1) File f = new File("/","autoexec.bat");
2) DataInputStream d = new
DataInputStream(System.in);
3) OutputStreamWriter o = new
OutputStreamWriter(System.out);
4) RandomAccessFile r = new
RandomAccessFile("OutFile");

Answer to
Question 49)

Question 50)

Given the folowing classes which of the following will compile without
error?

interface IFace{}
class CFace implements IFace{}
class Base{}
public class ObRef extends Base{
public static void main(String argv[]){
ObRef ob = new ObRef();
Base b = new Base();
Object o1 = new Object();
IFace o2 = new CFace();
}
}

1)o1=o2;
2)b=ob;
3)ob=b;
4)o1=b;

Answer to
Question 50)

Question 51)

Given the following code what will be the output?

class ValHold{
public int i = 10;
}

public class ObParm{
public static void main(String argv[]){
ObParm o = new ObParm();
o.amethod();
}
public void amethod(){
int i = 99;
ValHold v = new ValHold();
v.i=30;
another(v,i);
System.out.print( v.i );
}//End of amethod

public void another(ValHold v, int i){
i=0;
v.i = 20;
ValHold vh = new ValHold();
v =  vh;
System.out.print(v.i);
System.out.print(i);
}//End of another

}

1) 10030
2) 20030
3) 209930
4) 10020

Answer to
Question 51)

Question 52)

Given the following class definition, which of the following methods could be
legally placed after the comment

//Here 
public class Rid{
public void amethod(int i, String s){}
//Here
}

1)public void amethod(String s, int i){}
2)public int amethod(int i,
String s){}
3)public void amethod(int i, String mystring){}
4) public void
Amethod(int i, String s) {}

Answer to
Question 52)

Question 53)

Given the following class definition which of the following can be legally
placed after the comment line
//Here ?

class Base{
public Base(int i){}
}



public class MyOver extends Base{
public static void main(String arg[]){
MyOver m = new MyOver(10);
}
MyOver(int i){
super(i);
}

MyOver(String s, int i){
this(i);
//Here
}
}

1)MyOver m = new MyOver();
2)super();
3)this("Hello",10);
4)Base b =
new Base(10);

Answer to
Question 53)

Question 54)

Given the following class definition, which of the following statements would
be legal after the comment //Here

class InOut{

String s= new String("Between");
public void amethod(final int iArgs){
int iam;
class Bicycle{
public void sayHello(){
//Here
}
}//End of bicycle class
}//End of amethod
public void another(){
int iOther;
}

}

1) System.out.println(s);
2) System.out.println(iOther);
3)
System.out.println(iam);
4) System.out.println(iArgs);

Answer to
Question 54)

Question 55)

Which of the following are methods of the Thread class?

1) yield()
2) sleep(long msec)
3) go()
4) stop()

Answer to
Question 55)

Question 56)

Which of the following methods are members of the Vector class and allow you
to input a new element

1) addElement
2) insert
3) append
4) addItem

Answer to
Question 56)

Question 57)

Which of the following statements are true?

1) Adding more classes via import statements will cause a performance
overhead, only import classes you actually use.
2) Under no circumstances can
a class be defined with the private modifier
3) A inner class may
under some circumstances be defined with the protected modifier
4) An
interface cannot be instantiated

Answer
57)

Question 58)

Which of the following are correct event handling methods

1) mousePressed(MouseEvent e){}
2) MousePressed(MouseClick e){}
3)
functionKey(KeyPress k){}
4) componentAdded(ContainerEvent e){}

Answer
58)

Question 59)

Which of the following are methods of the Collection interface?
1)
iterator
2) isEmpty
3) toArray
4) setText

Answer
59)

Question 60)

Which of the following best describes the use of the synchronized
keyword?

1) Allows two process to run in paralell but to communicate with each
other
2) Ensures only one thread at a time may access a method or
object
3) Ensures that two or more processes will start and end at the same
time
4) Ensures that two or more Threads will start and end at the same
time

Answer
60)

Answers

Answer 1)

Objective 1.2)

1) The code will compile and run, printing out the words "My Func"

A class that contains an abstract method must be declared abstract itself,
but may contain non abstract methods.

Saturday, July 3, 2010

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Friday, July 2, 2010

JAVA Technical Round Questions

Question 1)

Question 2)

Question 3)

Question 4)

Question 5)

Question 6)

Question 7)

Question 8)

Question 9)

Question 10)

Question 11)

Question 12)

Question 13)

Question 14)

Question 15)

Question 16)

Question 17)

Question 18)

Question 19)

Question 20)

Question 21)

Question 22)

Question 23)

Question 24)

Question 25)

Question 26)

Question 27)

Question 28)

Question 29)

Question 30)

Question 31)

Question 32)

Question 33)

Question 34)

Question 35)

Question 36)

Question 37)

Question 38)

Question 39)

Question 40)

Question 41)

Question 42)

Question 43)

Question 44)

Question 45)

Question 46)

Question 47)

Question 48)

Question 49)

Question 50)

Question 51)

Question 52)

Question 53)

Question 54)

Question 55)

Question 56)

Question 57)

Question 58)

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Question 60)

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