Question:* Which statements are true regarding ServletContext Init Parameters in the deployment descriptor?
Answer: • They are set at deployment-time, but accessed at run-time.
Answer: • They are set at deployment-time and can be updated at run-time.
Question:* Which of the following symbols are metacharacters supported by the java.util.regex API?
Answer: • .
Answer: • \
Question:* SQLException has a feature of chaining - identify the right code to execute the same from the following options:
Answer: • catch(SQLException e)
{
out.println(e.getMessage());
while((e=e.getNextException())!=null)
{
out.println(e.getMessage());
}
}
Question:* What is the result of an attempt to compile and run the given program?
public class Test107 {
public static void main(String[] args) {
System.out.println(test());
}
private static int test() {
return (true ? null : 0);
}
}
Answer: • It compiles, but throws NullPointerException at run-time.
Question:* Which of the following methods are members of the Vector class and allow you to input a new element?
Answer: • addElement
Question:* In which class is the notify method defined?
Answer: • Object
Question:* What is the output of the given program?
public class Test93 {
private int x = 0;
public static void main(String[] args) {
new Test93().test();
}
private int f(int x) { return ++x; }
private int g(int y) { return x++; }
private void test() {
System.out.print( f(x)==f(x) ? "f" : "#" );
System.out.print( g(x)==g(x) ? "g" : "#" );
}
}
Answer: • f#
Question:* Which design pattern reduces network traffic by acting as a caching proxy of a remote object?
Answer: • Value Object
Question:* What is the output of the given program?
public class Test89 {
public static void main(String[] args) {
T x = new T("X", null); x.start();
T y = new T("Y", x); y.start();
T z = new T("Z", y); z.start();
}
}
class T extends Thread {
private Thread predecessor;
private String name;
public T(String name, Thread predecessor) {
this.predecessor = predecessor;
this.name = name;
}
public void run() {
try {
Thread.sleep((int)(Math.random()*89));
System.out.print(name);
} catch (InterruptedException ie) {
ie.printStackTrace();
}
}
}
Answer: • any of the following: XYZ, XZY, YXZ, YZX, ZXY, ZYX
Question:* The principal finder method that must be implemented by every entity bean class is:
Answer: • findByPrimaryKey()
Question:* Which option lists Java access modifiers in the right order from the most permissive to the most restrictive?
Answer: • public, protected, <i>no modifier/default/package</i>, private
Question:* What should be the replacement of "//ABC" in the following code?
class Krit
{
String str= new String("OOPS !!! JAVA");
public void KritMethod(final int iArgs)
{
int iOne;
class Bicycle
{
public void sayHello()
{
//ABC
}
}
}
public void Method2()
{
int iTwo;
}
}
Answer: • System.out.print(str);
Question:* Assuming that val has been defined as an int for the code below, which values of val will result in "Test C" being printed?
if( val > 4 ) {
System.out.println("Test A");
} else if( val > 9 ) {
System.out.println("Test B");
} else
System.out.println("Test C");
Answer: • val between 0 and 4
Question:* What is the output of the given program?
public class Test118 extends _Test118 {
{
System.out.print("_INIT");
}
static {
System.out.print("_STATIC");
}
Test118() {
System.out.print("_CONST");
}
public static void main(String[] args) {
System.out.print("_MAIN");
new Test118();
}
}
class _Test118 {
_Test118() {
System.out.print("_BASE");
}
}
Answer: • _STATIC_MAIN_BASE_INIT_CONST
Question:* What will be the output, if the following program is run?
public class Test8 {
public static void main(String[] args) {
System.out.println(Math.sqrt(-4));
}
}
Answer: • NaN
Question:* What will be the output of this program?
public class Test {
public static void main(String args[]) {
int a, b;
a = 2;
b = 0;
System.out.println(g(a, new int[] { b }));
}
public static int g(int a, int b[]) {
b[0] = 2 * a;
return b[0];
}
}
Answer: • 4
Question:* There are three classes named A, B, and C. The class B is derived from class A and class C is derived from B. Which of the following relations are correct for the given classes?
Answer: • Any instance of B is an instance of A.
Question:* What is the output of the given console application?
public class Test19 {
public static void main(String[] args) {
final int X = 9;
int[][] a = {{5, 4, 3}, {9, 7, 2}, {1, 6, 8}};
for (int i=0; i<3; i++) {
for (int j=0; j<3; j++) {
if (a[i][j] == X) break;
System.out.print(a[i][j] + "" "");
}
}
}
}
Answer: • 5 4 3 1 6 8
Question:* Which of the following statements is true?
Answer: • public interface RemoteTrain extends java.rmi.Remote
Question:* The JDK comes with a special program that generates skeleton and stub objects that is known as:
Answer: • rmic
Question:* How many objects are created by the following code?
Object a, b, c, d, e;
e = new Object ();
b = a = e;
e = new Object ();
Answer: • 2
Question:* Which of these interfaces is the most applicable when creating a class that associates a set of keys with a set of values?
Answer: • Map
Question:* Which of the following is the correct syntax for creating a Session object?
Answer: • HttpSession ses=request.getSession();
Question:* Which statement is true about the given code?
public class Test78 {
public static void main(String[] args) throws Exception {
new JBean().setHeight(1).setWidth(2).setDepth(3).setDensity(9);
}
}
class JBean {
private int height, width, depth, density;
public JBean setHeight (int h) { this.height = h; return this; }
public JBean setWidth (int w) { this.width = w; return this; }
public JBean setDepth (int d) { this.depth = d; return this; }
public JBean setDensity (int d) { this.density = d; return this; }
}
Answer: • The code compiles and runs.
Question:* Choose all valid forms of the argument list for the FileOutputStream constructor shown below:
Answer: • FileOutputStream( File f )
Question:* Which of the following methods should be invoked by the container to get a bean back to its working state?
Answer: • EJBActivate()
Question:* Select all true statements:
Answer: • An abstract class can have non-abstract methods.
Question:* Which option could be used to see additional warnings about code that mixes legacy code with code that uses generics?
Answer: • -Xlint:unchecked
Question:* Assuming the servlet method for handling HTTPGET requests is doGet(HttpServletRequest req, HTTPServletResponse res), how can the request parameter in that servlet be retrieved?
Answer: • String value=req.getParameter("product");
Question:* Which of these is not an event listener adapter defined in the java.awt.event package?
Answer: • ActionAdapter
Question:* What would be the result of compiling and running the following code class?
public class Test {
public static void main(String args[]) {
Test t = new Test();
t.start();
}
public void start() {
int i = 2;
int j = 3;
int x = i & j;
System.out.println(x);
}
}
Answer: • The code will compile and print 2.
Question:* Which of the following are the methods of the Thread class?
Answer: • yield()
Question:* What protocol is used by the DatagramSocket class?
Answer: • UDP
Question:* Which statements are true? Select all true statements.
Answer: • A method can be declared synchronized.
Question:* Which exception must a setter of a constrained JavaBean property throw to prevent the property value from changing?
Answer: • PropertyVetoException
Question:* X.509 version 3 specifies which of the following?
Answer: • A format and content for digital certificates.
Question:* What will be the output when this code is compiled and run?
public class Test {
public Test() {
Bar b = new Bar();
Bar b1 = new Bar();
update(b);
update(b1);
b1 = b;
update(b);
update(b1);
}
private void update(Bar bar) {
bar.x = 20;
System.out.println(bar.x);
}
public static void main(String args[]) {
new Test();
}
private class Bar {
int x = 10;
}
}
Answer: • 20 20 20 20
Question:* Which of the following methods can be used for reporting a warning on a Connection object, Statement object & ResultSet object?
Answer: • getWarnings()
Question:* Which of the following are valid ways to define a thread in Java?
Answer: • Create a subclass of java.lang.Thread class
Question:* JDBC is based on:
Answer: • X/Open CLI (Call Level Interface)
Question:* Which of the following statements regarding abstract classes are true?
Answer: • The abstract class may have method implementation.
Question:* Which of the following is the name of the cookie used by Servlet Containers to maintain session information?
Answer: • JSESSIONID
Question:* Which method is called by the servlet container just after the servlet is removed from service?
Answer: • public void destroy() {// code...}
Question:* Which method in the HttpServlet class corresponds to the HTTPPUT method?
Answer: • doPut
Question:* Which of the following illustrates correct synchronization syntax?
Answer: • public synchronized void Process(){}
Question:* The transaction attribute of a bean is set to 'TX_REQUIRES_NEW.' What can be inferred about its behavior?
Answer: • The bean manages its own transaction.
Question:* How many objects are created in the given code?
Object x, y, z;
x = new Object();
y = new Object();
Answer: • 2
Question:* How does the set collection deal with duplicate elements?
Answer: • The add method returns false if you attempt to add an element with a duplicate value.
Question:* What is the output of the given program?
public class Test106 {
public static void main(String[] args) {
Integer x = 0;
Integer y = 0;
Integer a = 1000;
Integer b = 1000;
System.out.println( (a==b) + "; " + (x==y) );
}
}
Answer: • false; true
Question:* 1 <libraryPrefix:handlerName parameterNAme="value">
2 <%=23*counter %>
3 <b>Congratulations!</b>
Which of the following is the correct way to complete the code snippet above?
Answer: • </libraryPrefix:handlerName>
Question:* Which of the following transaction modes are supported by Enterprise Java Beans?
Answer: • All of the above
Question:* What is the output of the given program?
public class Test120 extends _Test120 {
{
System.out.print("_INIT");
}
static {
System.out.print("_STATIC");
}
Test120() {
System.out.print("_CONST");
}
public static void main(String[] args) {
System.out.print("_MAIN");
new Test120();
}
}
class _Test120 {
{
System.out.print("_BIN");
}
static {
System.out.print("_START");
}
_Test120() {
System.out.print("_BASE");
}
}
Answer: • _START_STATIC_MAIN_BIN_BASE_INIT_CONST
Question:* Which distributed object technology is most appropriate for systems that consist entirely of Java objects?
Answer: • RMI
Question:* The following code was written to save a handle to an EJBObject named 'bookEJBObject' for an online book shop:
javax.ejb.Handle bookHandle = _____________;
ObjectOutputStream stream = new ObjectOutputStream(newFileOutputStream(fileName));
stream.writeObject(bookHandle);
stream.close();
Which of the following methods should be filled in the blank?
Answer: • bookEJBObject.getHandle()
Question:* Which sequence will be printed when the following program is run?
import java.util.*;
public class Test {
public static void main(String str[]) {
List l = new ArrayList();
l.add(''1'');
l.add(''2'');
l.add(1,''3'');
System.out.println(l);
}
}
Answer: • [1, 3, 2]
Question:* Conventionally, which directory do servlet class files get placed on?
Answer: • WEB-INF\classes
Question:* Which is a proper way to declare and throw exception of class XYException?
Answer: • class XYException extends Exception {}
...
throw new XYException();
Question:* Which of the following JDBC methods is used to retrieve large binary objects?
Answer: • getBinaryStream()
Question:* What is the output of the given program?
public class Test129 {
public static void main(String[] args) {
A a = new A2();
B b = new B2();
System.out.println(a.a + "" + b.b);
}
}
class A { int a = 1; }
class A2 extends A { int a = 2; }
class B { public int b = 1; }
class B2 extends B { public int b = 2; }
Answer: • 11
Question:* What exception is thrown by this code, if arr[j]>arr[j+1]:
public static void main(String[] args) {
int []arr={12,23,43,34,3,6,7,1,9,6};
{
int temp;
for (int i=0;i<arr.length;i++)
{
for (int j=0;j<arr.length-i;j++ )
{
if (arr[j]>arr[j+1])
{
temp=arr[j];
arr[j+1]=arr[j];
arr[j+1]=temp;
}
}
}
}
for(int i=0; i<arr.length; i++)
{
System.out.print(arr[i] + " ");
}
}
Answer: • ArrayIndexOutOfBoundException
Question:* Which of the following is a well-known HTTP port?
Answer: • 80
Question:* What is the output of the given console application?
public class Test31 {
public static void main(String[] args) {
test();
}
public static void test() {
try {
System.out.print("-try");
return;
} catch (Exception e) {
System.out.print("-catch");
} finally {
System.out.print("-finally");
}
}
}
Answer: • -try-finally
Question:* Which of these interfaces are used by implementations of models for JTable?
Answer: • TableModel
Question:* Which of the following require explicit try/catch exception handling by the programmer?
Answer: • Attempting to open a network socket
Question:* What is the output of the given program?
public class Test89 {
public static void main(String[] args) {
T x = new T(""X"", null); x.start();
T y = new T(""Y"", x); y.start();
T z = new T(""Z"", y); z.start();
}
}
class T extends Thread {
private Thread predecessor;
private String name;
public T(String name, Thread predecessor) {
this.predecessor = predecessor;
this.name = name;
}
public void run() {
try {
Thread.sleep((int)(Math.random()*89));
System.out.print(name);
} catch (InterruptedException ie) {
ie.printStackTrace();
}
}
}
Answer: • Any of the following: XYZ, XZY, YXZ, YZX, ZXY, ZYX
Question:* Which of the following code snippets will take transform input string "2012/06/05" to output string "05 - 06 - 2012"?
Answer: • String dateString = "2012/06/05";
Date date = new SimpleDateFormat("yyyy/MM/dd").parse(dateString);
SimpleDateFormat sdf = new SimpleDateFormat("dd - MM - yyyy");
System.out.println(sdf.format(date));
Question:* Which statement is true regarding ServletContext Initialization Parameters in the deployment descriptor?
Answer: • They are accessible by all servlets in a given web application.
Question:* Which of the following statements is true of the HashMap class?
Answer: • It stores information as key/value pairs.
Question:* Which distributed object technology is most appropriate for systems that consist of objects written in different languages and that execute on different operating system platforms?
Answer: • CORBA
Question:* What is the output of the given code?
public class Test15 {
public static void main(String[] args) {
VO a = new VO(2);
VO b = new VO(3);
swapONE(a, b);
print(a, b);
swapTWO(a, b);
print(a, b);
}
private static void print(VO a, VO b) {
System.out.print(a.toString() + b.toString());
}
public static void swapONE(VO a, VO b) {
VO tmp = a;
a = b;
b = tmp;
}
public static void swapTWO(VO a, VO b) {
int tmp = a.x;
a.x = b.x;
b.x = tmp;
}
}
class VO {
public int x;
public VO(int x) {
this.x = x;
}
public String toString() {
return String.valueOf(x);
}
}
Answer: • 2332
Question:* What would happen on trying to compile and run the following code?
class House {
public final void MaintainMethod() {
System.out.println("MaintainMethod");
}
}
public class Building extends House {
public static void main(String argv[]) {
House h = new House();
h.MaintainMethod();
}
}
Answer: • Successful compilation and output of "MaintainMethod" at run time.
Question:* Which of the following code snippets will generate five random numbers between 0 and 200?
Answer: • Random r = new Random();
for (int i = 0; i < 5; i++) {
System.out.println(r.nextInt(200));
}
Question:* What will be the output when this code is compiled and run?
public class Test {
public Test() {
Bar b = new Bar();
Bar b1 = new Bar();
update(b);
update(b1);
b1 = b;
update(b);
update(b1);
}
private void update(Bar bar) {
bar.x = 20;
System.out.println(bar.x);
}
public static void main(String args[]) {
new Test();
}
private class Bar {
int x = 10;
}
}
Answer: • 20 20 20 20
Question:* Which class contains a method to create a directory?
Answer: • File
Question:* What is the output of the given program?
public class Test130 {
public static void main(String[] args) {
A a = new A2();
B b = new B2();
System.out.println(a.a + """" + b.b());
}
}
class A {
public int a = 1;
}
class A2 extends A {
public int a = 2;
}
class B {
public int b() { return 1; }
}
class B2 extends B {
public int b() { return 2; }
}
Answer: • 12
Question:* Which of the following is the correct syntax for suggesting that the JVM perform garbage collection?
Answer: • System.gc();
Question:* Why can't a Graphics object be created using the following statement?
Graphics g = new Graphics();
Answer: • The Graphics class is an abstract class.
Question:* Select all correct statements:
Answer: • Vector is synchronized, ArrayList is not synchronized
Question:* What is the output of the given program?
public class Test97 {
public static void main(String[] args) {
int[][] a = new int[2][2];
System.out.println(a.length);
}
}
Answer: • 2
Question:* Which of the following is false?
Answer: • A while loop can be used because next () & previous () methods return -1 beyond the resultset.
Question:* Consider the following code:
public class Jam {
public void apple(int i, String s) {
}
//ABC
}
Choose possible valid code replacements of "//ABC" among the choices:
Answer: • public void apple(String s, int i) {}
Question:* RMI allows remote communication between:
Answer: • Java and Java
Question:* Which of the following interfaces makes it possible for Java to save an object to a file and turn it into a data stream?
Answer: • java.io.Serializable
Question:* How many objects are created in the given code?
Object x, y, z;
x = new Object();
y = new Object()
Answer: • 2
Question:* As part of the type erasure process, when compiling a class or interface that extends a parameterized class or implements a parameterized interface, the compiler may need to create a synthetic method, called a _________.
Answer: • bridge method
Question:* Consider the following code:
public static void main(String bicycle[])
{
System.out.println(bicycle[0]);
}
What would be the result if "java TwoTyre one two" is entered in the command line?
Answer: • one
Question:* With regard to the destroy lifecycle method, identify the correct statements about its purpose or about how and when it is invoked.
Answer: • It gives the servlet an opportunity to clean up resources.
Question:* What is the term to describe a situation where two or more threads are blocked forever, waiting for each other?
Answer: • deadlock
Question:* What will be the output of the following code?
public class MyTest {
public static void main(String[] args) {
for (int i=0; i > 10; i+=2) {
System.out.println(i);
}
}
}
Answer: • Nothing will be printed.
Question:* Which of the following cannot apply to constructors?
Answer: • Void return type
