Dd5

1. Consider s1 and s2 are sets. Which of the following options gives the exact meaning of the method call s1.retainAll(s2)?

Transforms s1 into the union of s1 and s2

Transforms s1 into the intersection of s1 and s2.

Copies elements from s2 to s1

Returns true if s2 is a subset of s1

2. Which of the following is the process of creating a new class from an existing class?

Polymorphism

Inheritance

Abstraction

Reusability

3. Consider the following code: public class WrapIt { public static void main(String[] args) { new WrapIt().testC('a'); } public void testC(char ch) { Integer ss = new Integer(ch); Character cc = new Character(ch); if(ss.equals(cc)) System.out.print("equals "); if(ss.intValue()==cc.charValue()) { System.out.println("EQ"); } } } Which of the following gives the valid output for the above code?

Prints: EQ

Prints: equals

Compile-time error: Wrapper types cannot be compared using equals

Prints: equals EQ

Compile-time error: Integer wrapper cannot accept char type

4. Consider the following code: class One { public One() { System.out.print(1); } } class Two extends One { public Two() { System.out.print(2); } } class Three extends Two { public Three() { System.out.print(3); } } public class Numbers { public static void main(String[] argv) { new Three(); } } Which of the following will be the output for the above program?

3

No output

321

32

123

5. Consider the following code: 1. public class GetArray2 { 2. public static void main(String [] args) { 3. int [][] holdit = new int[6][]; 4. for(int x = 0;x<6;x++) { 5. holdit[x] = new int[3]; 6. holdit[x][0] = (x + 0); 7. holdit[x][1] = (x + 1); 8. holdit[x][2] = (x + 2); 9. System.out.println(holdit[x][0]+" "+holdit[x][1]+" "+holdit[x][2]); 10. } 11. } 12. } Which of the following gives the valid output for above?

Compilation fails because of an error on line 5

Compilation fails because of an error on line 3

6. Consider the following code snippet: public class TestString10{ public void print() { String s = "Hello"; StringBuffer sb = new StringBuffer("Hello"); concatinateStrings(s, sb); System.out.println(s+" "+sb); } public void concatinateStrings(String str, StringBuffer strBuff){ StringBuffer sk = strBuff; str = str + " world"; sk.append(" world"); } public static void main (String[] args) { TestString10 t = new TestString10(); t.print(); } } What will be the output of the above code snippet?

Hello Hello Hello

World Hello Hello

Hello Hello world

Hello world Hello

World world world

7. Consider the following code snippet: import java.io.*; public class IOCode1 { public static void main(String args[]) throws IOException { BufferedReader br1 = new BufferedReader( new InputStreamReader(System.in)); BufferedWriter br2 = new BufferedWriter( new OutputStreamWriter(System.out)); String line = null; while( (line = br1.readLine()) != null ) { br2.write(line); br2.flush(); } br1.close(); br2.close(); } } What will be the output for the above code snippet?

Reads the text from keyboard character by character and prints the same to the console on typing every character.

Reads the text from keyboard and prints the same to the console on pressing Ctrl Z

8. What of the following is the default Scroll type for a ResultSet object?

ResultSet.TYPE_SCROLL_SENSITIVE

ResultSet.TYPE_SCROLLABLE

ResultSet.TYPE_SCROLL_INSENSITIVE

ResultSet.TYPE_FORWARD_ONLY

ResultSet.TYPE_SCROLL_BIDIRECTIONAL

9. Consider the following partial code: public class CreditCard { private String cardID; private Integer limit; public String ownerName; public void setCardInformation(String cardID, String ownerName, Integer limit) { this.cardID = cardID; this.ownerName = ownerName; this.limit = limit; } } Which of the following statement is True regarding the above given code?

The class is fully encapsulated

The ownerName variable breaks encapsulation

The setCardInformation method breaks encapsulation

The cardID and limit variables break polymorphism

The code demonstrates polymorphism

10. Which of the following types of driver provides maximum decoupling between database and Java application?

Type IV driver

Type II driver

Type I driver

Type III driver

11. Which of the following statements are true about String Arrays? (Choose 2)

Array index can be a negative value

String[][] s;

Array decaration: String[6] strarray;

String[][] s = new String[5][];

Array index can be a long value

Submit

12. Consider the following program: import java.io.*; public class SteppedTryCatch { public static void main(String[] args) { try { try { try { // Line 1 } catch(Exception e3) { System.out.println("Exception 1"); // Line 2 } } catch(IOException e2) { System.out.println("Exception 2"); // Line 3 } } catch(FileNotFoundException e1) { System.out.println("Exception 3"); } } } You need to make the above program to print the output as Exception 1 Exception 2 Exception 3 Which of the following when substituted in place of commented lines (// Line 1, Line 2 and Line 3) produce the desired output?

Line 1 : throw new IOException(); Line 2 : throw new FileNotFoundException(); Line 3 : throw new Exception();

Line 1 : throw new Exception(); Line 2 : throw new IOException(); Line 3 : throw new FileNotFoundException();

The code is wrong. Exceptions should be caught in reversed hierarchy order.

Line 1 : throw new IOException(); Line 2 : throw new IOException(); Line 3 : throw new IOException();

Line 1 : throw new FileNotFoundException(); Line 2 : throw new IOException(); Line 3 : throw new Exception();

13. Consider the following code snippet: import java.util.*; public class TestCol3 { public static void main(String[] args) { List l = new ArrayList(); l.add("One"); l.add("Two"); l.add("Three"); l.add("Four"); l.add("One"); l.add("Four"); Set h = new HashSet(); h.addAll(l); System.out.println("Size:" + l.size() + h.size()); } } What will be the output of the following code snippet?

Size: 64

Size: 44

Size: 66

Compilation error

Size: 46

14. Consider the following code snippets: class GC2 { public GC2 getIt(GC2 gc2) { return gc2; } public static void main(String a[]) { GC2 g = GC2(); GC2 c = GC2(); c = g.getIt(c); } } How many objects are eligible for Garbage Collection?

Two

None of the objects are eligible

Three

Four

One

15. Consider the following code: class Planet { } class Earth extends Planet { } public class WelcomePlanet { public static void welcomePlanet(Planet planet) { if (planet instanceof Earth) { System.out.println("Welcome!"); } else if (planet instanceof Planet) { System.out.println("Planet!"); } else { System.exit(0); } } public static void main(String args[]) { WelcomePlanet wp = new WelcomePlanet(); Planet planet = new Earth(); welcomePlanet(planet); } } Which of the following will be the output of the above program?

The code runs with no output

Compilation fails

Welcome!

Planet!

An exception is thrown at runtime

16. A monitor called 'mon' has 5 threads in its waiting pool; all these waiting threads have the same priority. One of the threads is thread1. How can you notify thread1 so that it alone moves from Waiting state to Ready State?

Execute mon.notify(thread1); from synchronized code of any object

Execute notify(thread1); from within synchronized code of mon

You cannot specify which thread will get notified

Execute thread1.notify(); from synchronized code of any object

Execute thread1.notify(); from any code(synchronized or not) of any object

17. Consider the following code snippet: import java.util.*; public class TestCol6 { public static void main(String args[] ){ ArrayList a = new ArrayList(); // Line 1 a.add(new Integer(10)); a.add(new String("Hello")); a.add(new Double(34.9)); } } Which of the following code snippets when replaced at the line marked //Line 1, will make the ArrayList a to accept only Wrapper types of primitive numerics?

ArrayList[Integer] a = new ArrayList[Integer]();

ArrayList[WrapperType] a = new ArrayList[WrapperType]();

ArrayList[Integer] a = new ArrayList[Double]();

ArrayList[Double] a = new ArrayList[Double]();

ArrayList[Number] a = new ArrayList[Number]();

18. Consider the following: Class A contains the following: i. Instance Block ii. main() method iii. Static Block iv. Default Constructor of A Assume an instance of class A is created in the main() method. Which of the following gives the correct sequence of execution of above mentioned elements?

Iii, ii, i, iv

Iii, i, ii, iv

Ii, i, iv, iii

I, iv, iii, ii

Iv, iii, ii, i

19. Which of the following options are true about Associations?(choose 2)

Association refers to a class reuses the properties and methods of another class

Association refers to an object composed of set of other objects

Association refers to binding of related data and behaviours into a single entity

Associations are bi-directional

In Associations, cardinality refers to the number of related objects

Submit

20. Consider the following code: public class Pass { static int j=20; public static void main(String argv[]) { int i=10; Pass p = new Pass(); p.amethod(i); System.out.println(i); System.out.println(j); } public void amethod(int x) { x=x2; j=j2; } } Which of the following gives the correct output for the above code?

Prints: 10, 40

Prints: 20, 40

Compile time Error: Method parameter does not match variable

Prints: 10,20

21. To which of the following elements, annotations can be applied? (Choose 3)

Classes

Fields

Jar files

Class files

Methods

Submit

22. Which of the following gives the correct sequence of execution of callback methods in a JUnit TestCase?

1. setUp() method 2. testXXX() method 3. tearDown() method Above sequence is for every testXXX() method in the TestCase

1. setUp() method 2. tearDown() method 3. All testXXX() methods

1. All testXXX() methods 2. setUp() method 3. tearDown() method

1. setUp() method 2. All testXXX() methods 3. tearDown() method

23. Consider the following program: 1. class CheckedException extends RuntimeException { } 2. class UncheckedException extends Exception { } 3. public class Check { 4. public static void main(String args[]) { 5. generateException1(); 6. generateException2(); 7. } 8. 9. private static void generateException1() { 10. throw new CheckedException(); 11. } 12. 13. private static void generateException2() { 14. throw new UncheckedException(); 15. } 16. } Which of the following is true regarding the above given program?

No compilation error but throws RuntimeException on running the code

Compilation error at line 10

Compilation error at line 14

Compilation error at line 5

Compilation error at line 6

24. Which of the following pre-defined annotations requires that an annotation type should itself annotate with, in order to make the information in an user- defined annotation type appear in Javadoc-generated documentation?

@Override

@Documented

@Comment

@Deprecated

25. State which of the following are default delimiters?(Choose 3)

Form feed character

Tab character

The dollar character

Space character

The underscore character

Submit

26. Consider there are two threads, "Thread A" and "Thread B". "Thread A" holds a lock on "Object X". "Thread B" is blocked inside a wait call on Object X. Which of the following will make the "Thread B" runnable?

Thread A's wait() times out.

Thread A releases the lock on B by calling the notifyAll()

Thread A is interrupted.

Thread B is interrupted.

Thread B releases the lock on object X and calls the notify() method on thread

27. Which of the following statements are true? (choose 2)

An object becomes eligible for garbage collection when all references denoting it are set to null

The automatic garbage collection of the JVM prevents programs from ever running out of memory

A program can suggest that garbage collection be performed but not force it

None of the listed options

Garbage collection is platform independent

Submit

28. Consider the following code: public class Code9 { public static void main(String args[]) { System.out.println(Math.abs(Integer.MIN_VALUE)); } } Which of the following will be the output for the above given program? (Choose 2)

Compilation Error

Compiles successfully and prints a value which is less than zero

Compiles successfully and prints a value which is equal to Integer.MIN_VALUE

Compiles successfully and prints a value which is equal to -Integer.MAX_VALUE

Compiles successfully and prints a value which is equal to Integer.MIN_VALUE + 1

Submit

29. Consider the following code: package com.java.test; public class A { public void m1() {System.out.print("A.m1, ");} protected void m2() {System.out.print("A.m2, ");} private void m3() {System.out.print("A.m3, ");} void m4() {System.out.print("A.m4, ");} } class B { public static void main(String[] args) { A a = new A(); a.m1(); // 1 a.m2(); // 2 a.m3(); // 3 a.m4(); // 4 } } Assume that both of the above classes are stored in a single source file called 'A.java'. Which of the following gives the valid output of the above code?

Prints: A.m1, A.m2, A.m3, A.m4,

Compile-time error at 4.

Compile-time error at 3.

Compile-time error at 2.

Compile-time error at 1.

30. Consider the following program: class TestThread extends Thread { public static void main(String apps[]) { Thread t = null; TestThread tc = new TestThread(); for (int i =0;i<5;i++) { t = new Thread(tc); // Insert Code Here } } public void run() { System.out.println("Hello"); } } Which of the following code when substituted to the commented line (//Insert Code) will make the program to execute properly?

T.join()

T.start()

No additional code required

T.run()

T.sleep(1000)

31. Consider the following code: package test; class Target { String name = "hello"; } Which of the following options are valid that can directly access and change the value of the variable 'name' in the above code? (Choose 2)

Any class in the test package

Any class that extends Target outside the test package

Any class

Only the Target class

Any class that extends Target within the test package

Submit

32. Consider the following code segment: public class ExampleThree { public static void main(String args[]) { int i = 1; // Line 1 short s = 1; // Line 2 long l = 1; // Line 3 i = l + i; // Line 4 l = s + i; // Line 5 } } Which of the following gives the line in the above program that will result in error?

Line 4

Line 7

Line 6

Line 3

Line 5

33. Consider the following scenario: An application needs to write a log file on the sequence of actions it takes while running. Which of the following stream classes can be used to implement the above requirement?

FileOutputStream

LogWriter

PrintWriter

OutputStream

Writer

34. Consider the following code: class TM { public static void main(String a[]) { System.out.println(a[0]+a[0].length()+a.length); } } Select the valid inputs and outputs. (Choose 2)

Input : java TM "Trick1"+"Trick2" "Trick3" Output: Trick1+Trick2132

Input : java TM 'J2SE', 'J2EE', 'J2ME' Output: J2SE43

Input : java TM 123+456 "abc" "Tricky" Output: 57933

Input : java TM 'This is really tricky' Output: This is really tricky211

Input : java TM "123", abc+234 Output: 123,42

Submit

35. Consider the following code: public class TH2 { public static synchronized void main(String[] args) throws InterruptedException { Thread t = new Thread(); t.start(); System.out.print("keep"); t.wait(10000); System.out.print("Smiling"); } } Which of the following gives the valid ouptut for the above code?

It prints keepSmiling with a 10000-second delay between keep and Smiling.

It prints keepSmiling with a 10-second delay between keep and Smiling

An exception is thrown at runtime

It prints keep and never exits

It prints keepSmiling and exits almost immeditately

36. Which of the following statements is true about NavigableSet interface?

A SortedSet extended with navigation methods for Maps.

A SortedSet extended with navigation methods for Lists.

A new class implementation of Set which can navigate the ResultSet object

A SortedSet extended with navigation methods reporting closest matches for given search targets.

37. Consider the following code: 1. public class Boxer1{ 2. Integer i; 3. int x; 4. 5. public Boxer1(int y) { 6. x = i+y; 7. System.out.println(x); 8. } 9. 10. public static void main(String[] args) { 11. new Boxer1(new Integer(4)); 12. } 13. } Which of the following will be the output of the above program?

Compilation fails because of an error in line 11

A NullPointerException occurs at runtime

Prints: 4

A NumberFormatException occurs at runtime

38. Which of the following options are true? (Choose 2)

Error objects are thrown only by JVM

Errors can be thrown programmatically

A class can extend Error class and can be used as user-defined Error class

Errors are handled only by JVM

Errors cannot be handled programmatically using try-catch blocks.

Submit

39. Consider the following code: public class ThrowsException { static void throwMethod() { System.out.println("Inside throwMethod."); throw new IllegalAccessException("exception"); } public static void main(String args[]) { try { throwMethod(); } catch (IllegalAccessException e) { System.out.println("Caught " + e); } } } Which of the following gives the output for the above given code?

Compiles successfully, nothing is printed

Compilation Error

Runtime Error

D. Inside showMethod. followed by caught: java.lang.IllegalAccessException: exception

40. Which of the following options give the names of the data structures that can be used for Range-View operations, but no nulls?(choose 2)

SortedSet

List

Map

Vector

Submit

41. Which of the following classes is used to handle the abnormal situation that may occur during database calls using JDBC API?

SQLException

Driver

Connection

DriverManager

Statement

42. Consider the following code snippet: interface InterfaceOne { int ID = 10; int getAccess(); } interface InterfaceTwo { int ID = 20; int getAccess(); } class InterfaceImpl implements InterfaceOne, InterfaceTwo { public int getAccess() { if (this instanceof InterfaceOne) { return InterfaceOne.ID; } else { return InterfaceTwo.ID; } } } public class Code { public static void main(String args[]) { InterfaceOne i1 = new InterfaceImpl(); System.out.println(i1.getAccess()); InterfaceTwo i2 = (InterfaceTwo) i1; System.out.println(i2.getAccess()); } } Which of the following will be the output for the above code snippet?

10 10

10 20

Compile time error. Incompatible Type conversion.

20 10

20 20

43. Consider the following code: class A is defined in packageone as follows: package com.packageone; public class A { private int x; public A(int x) { this(); this.x = x; } abstract void print(); } And class B is defined in packagetwo as follows: package com.packagetwo; import com.packageone.A; class B extends A { B(int x) { super(x); } void print() { System.out.println(x); } } class C { public static void main(String args[]) { A a = new B(10); } } Which of the following changes will make the code to run properly? (Choose 3)

Class B should be declared public abstract

Class A should be declared public abstract

The print method in class B should refer the x as super.x

The member x in class A should be declared as protected

This() method call should be removed from the class A constructor

Submit

44. Which of the following statements are true regarding equals() method?(Choose 3)

Defined in the Object class

Essential for inheriting a class

Used for object's content comparison

It is polymorphic

Declared in the Object class

Submit

45. Consider the following code snippet: public class Demo extends Object { String Title; public Demo( String t ){ Title = t; } public void showTitle() { System.out.println( "Title is " + Title ); } } class DerivedDemo extends Demo { public void setTitle( String tt ) { Title = tt ; } } public class TasteIt { public static void main(String args[]) { DerivedDemo dd = new DerivedDemo(); dd.showTitle(); Which of the following option will be the output for the above code snippet?

Prints: "Title is null" to standard output.

A NullPointerException is thrown at Runtime

A ClassCastException is thrown at Runtime

Compilation Error

1. Consider s1 and s2 are sets. Which of the following options gives the exact meaning of the method call s1.retainAll(s2)?

2.

What first name or nickname would you like us to use?

2. Which of the following is the process of creating a new class from an existing class?

8. What of the following is the default Scroll type for a ResultSet object?

10. Which of the following types of driver provides maximum decoupling between database and Java application?

11. Which of the following statements are true about String Arrays? (Choose 2)

14. Consider the following code snippets: class GC2 { public GC2 getIt(GC2 gc2) { return gc2; } public static void main(String a[]) { GC2 g = GC2(); GC2 c = GC2(); c = g.getIt(c); } } How many objects are eligible for Garbage Collection?

16. A monitor called 'mon' has 5 threads in its waiting pool; all these waiting threads have the same priority. One of the threads is thread1. How can you notify thread1 so that it alone moves from Waiting state to Ready State?

18. Consider the following: Class A contains the following: i. Instance Block ii. main() method iii. Static Block iv. Default Constructor of A Assume an instance of class A is created in the main() method. Which of the following gives the correct sequence of execution of above mentioned elements?

19. Which of the following options are true about Associations?(choose 2)

21. To which of the following elements, annotations can be applied? (Choose 3)

22. Which of the following gives the correct sequence of execution of callback methods in a JUnit TestCase?

24. Which of the following pre-defined annotations requires that an annotation type should itself annotate with, in order to make the information in an user- defined annotation type appear in Javadoc-generated documentation?

25. State which of the following are default delimiters?(Choose 3)

26. Consider there are two threads, "Thread A" and "Thread B". "Thread A" holds a lock on "Object X". "Thread B" is blocked inside a wait call on Object X. Which of the following will make the "Thread B" runnable?

27. Which of the following statements are true? (choose 2)

28. Consider the following code: public class Code9 { public static void main(String args[]) { System.out.println(Math.abs(Integer.MIN_VALUE)); } } Which of the following will be the output for the above given program? (Choose 2)

31. Consider the following code: package test; class Target { String name = "hello"; } Which of the following options are valid that can directly access and change the value of the variable 'name' in the above code? (Choose 2)

33. Consider the following scenario: An application needs to write a log file on the sequence of actions it takes while running. Which of the following stream classes can be used to implement the above requirement?

34. Consider the following code: class TM { public static void main(String a[]) { System.out.println(a[0]+a[0].length()+a.length); } } Select the valid inputs and outputs. (Choose 2)

36. Which of the following statements is true about NavigableSet interface?

38. Which of the following options are true? (Choose 2)

40. Which of the following options give the names of the data structures that can be used for Range-View operations, but no nulls?(choose 2)

41. Which of the following classes is used to handle the abnormal situation that may occur during database calls using JDBC API?

44. Which of the following statements are true regarding equals() method?(Choose 3)