Question 1 (5 points) What is displayed on the console when running the followin

Question

Question 1 (5 points)

What is displayed on the console when running the following program?

public class Quiz2B
{
public static void main(String[] args)
{
try
{
System.out.println("Welcome to Java");
int i = 0;
int y = 2 / i;
System.out.println("Welcome to Java");
}
catch (RuntimeException ex)
{
System.out.println("Welcome to Java");
}
finally
{
System.out.println("End of the block");
}
}
}

Question 1 options:

The program displays Welcome to Java two times followed by End of the block.

The program displays Welcome to Java two times.

The program displays Welcome to Java three times followed by End of the block.

The program displays Welcome to Java three times.

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Question 2 (5 points)

Under what conditions must a throws clause be added to a method signature

Question 2 options:

Whenever any checked exception that can be thrown by the method is not caught

Whenever any unchecked exception that can be thrown by the method is not caught

Whenever any exception can be thrown by the method

Whenever any checked exception can be thrown by the method

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Question 3 (5 points)

What is displayed on the console when running the following program?

public class Quiz2C
{
public static void main(String[] args)
{
try
{
method();
System.out.println("After the method call");
}
catch (NumberFormatException ex)
{
System.out.println("NumberFormatException");
}
catch (RuntimeException ex)
{
System.out.println("RuntimeException");
}
}

private static void method()
{
String s = "8.3";
Integer.parseInt(s);

int i = 0;
int y = 2 / i;
System.out.println("Welcome to Java");
}
}

Question 3 options:

The program displays NumberFormatException

The program displays NumberFormatException followed by After the method call

The program displays NumberFormatException followed by RuntimeException

The program has a compilation error

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Question 4 (5 points)

What exceptions will be caught by a catch block that catches exceptions of the class RuntimeException?

Question 4 options:

Exceptions of type RuntimeException and any of its subclasses

Only exceptions of type RuntimeException

Any exception

Exceptions of type RuntimeException and any of its superclasses

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Question 5 (5 points)

What exception type does the following program throw?

public class Quiz2D
{
public static void main(String[] args)
{
Object object = new Object();
String string = (String) object;
}
}

Question 5 options:

ClassCastException

ArithmeticException

No exception

StringIndexOutOfBoundsException

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Question 6 (5 points)

What is wrong in the following program?

public class Quiz2E

public static void main(String[] args)
{
try
{
System.out.println("Hello world");
}
}
}

Question 6 options:

A method call that does not declare exceptions cannot be placed inside a try block

You cannot have a try block without a catch block

Nothing is wrong

You cannot have a try block without a catch block or a finally block

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Question 7 (5 points)

Select the correct statement regarding the program show below:

public class Quiz2G
{
public static void main(String[] args)
{
if (Integer.parseInt(args[0]) == 0)
throw new Exception("Invalid Command Line Argument");
}
}

Question 7 options:

The program will not compile because a throws clause is needed

The program will compile without any errors

The program will not compile because Exception is an unchecked exception

The program will not compile because parseInt could throw NumberFormatException and it is never caught

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Question 8 (5 points)

The difference between throw and throws is correctly explained by which of the following statements?

Question 8 options:

The two reserved words are interchangeable

throw is a reserved word, but throws is not

Either one can be used to throw an exception

throws is used in a method signature, throw is used to throw an exception

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Question 9 (5 points)

What will occur if the catch block in program show below are reversed?

class Quiz2H
{
public static void main(String[] args)
{
try
{
aMethod();
System.out.println("After the call");
}
catch (ArithmeticException exception)
{
System.out.println("Arithmetic Exception");
}
catch (RuntimeException exception)
{
System.out.println("Runtime Exception");
}
System.out.println("After the try-catch statement");
}
private static void aMethod() throws RuntimeException
{
int x = 1/0;
}
}

Question 9 options:

The change will have no effect, the program will work the same as before

The program will no longer compile

Only the RuntimeException will be caught

Both exceptions will be caught

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Question 10 (5 points)

What occurs when an exception is not caught in the current method?

Question 10 options:

The exception is propagated to the method that called the current method

The exception is rethrown

The program always terminates and displays an error message

The exception is ignored

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Question 11 (5 points)

Which of the following statements about type compatibility is true?

Question 11 options:

An object of a subclass can be assigned to a reference to its superclass without a type cast

Assigning an object of a superclass to a reference to one of its subclasses always causes a compilation error whether type casting is used or not

An object of a superclass can be assigned to a reference to one of its subclasses without casting

An object of a subclass can be assigned to a reference to its superclass, but type casting is required

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Question 12 (5 points)

Which of the following statements about final classes is correct?

Question 12 options:

A final class must have all abstract methods

A final class cannot have any instances

A final class cannot be extended

A final class cannot have a constructor

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Question 13 (5 points)

Which of the following expressions evaluates to false?

class C1 {}
class C2 extends C1 { }
class C3 extends C2 { }
class C4 extends C1 {}

C1 c1 = new C1();
C1 c2 = new C2();
C1 c3 = new C3();
C1 c4 = new C4();

Question 13 options:

c1 instanceof C1

c2 instanceof C1

c4 instanceof C2

c3 instanceof C1

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Question 14 (5 points)

Select the correct statement about interfaces and abstract classes among those shown below.

Question 14 options:

An abstract class cannot have any constructors

It is possible to create an instance of an abstract class

An abstract class can have ordinary methods but an interface cannot

No class can implement more than one interface

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Question 15 (5 points)

Which of the following declarations are valid?

class Base
{
...
}

interface Spec
{
...
}

class Derived extends Base implements Spec
{
}

Question 15 options:

Spec object4 = new Base();

Derived object2 = new Base();

Spec object3 = new Derived();

Derived object5 = new Spec();

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Question 16 (5 points)

Which of the following can contain a constructor?

Question 16 options:

Any nonabstract class or interface

Any class or interface

Any nonabstract or abstract class

Any abstract class or interface

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Question 17 (5 points)

What is the output the program shown below.

interface A
{
}

class D extends C
{
}

class C
{
}

class B extends D implements A
{
}

public class Quiz2F
{
public static void main(String[] args)
{
B b = new B();
if (b instanceof A)
System.out.println("b is an instance of A");
if (b instanceof C)
System.out.println("b is an instance of C");
}
}

Question 17 options:

b is an instance of C

Nothing

b is an instance of A

b is an instance of A followed by b is an instance of C

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Question 18 (5 points)

Which of the following class definitions defines a legal abstract class?

Question 18 options:

class A { abstract void unfinished() { } }

public class abstract A { abstract void unfinished(); }

class A { abstract void unfinished(); }

abstract class A { abstract void unfinished(); }

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Question 19 (5 points)

Which of the following statements regarding abstract methods is not true?

Question 19 options:

A data field can be declared abstract

It is possible to declare an abstract class that contains no abstract methods

A class that contains abstract methods must be abstract

Abstract classes can have constructors

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Question 20 (5 points)

What is true about using the reserved word super?

Question 20 options:

It can only be used in a class that contains an extends clause

It can only be used in a constructor

It can only be used in superclasses

It can only be used in subclasses

The program displays Welcome to Java two times followed by End of the block.

The program displays Welcome to Java two times.

The program displays Welcome to Java three times followed by End of the block.

The program displays Welcome to Java three times.

Explanation / Answer

Question 1

Answer: The program displays Welcome to Java two times followed by End of the block.

Explanation: As per the given code, there are no exceptions in the try-block so the catch block will not execute. The final-block will execute if it may contains exceptions or may not contains the exceptions.

______________________________________________________________________

Question 2

Answer: Whenever any checked exception that can be thrown by the method is not caught.

Explanation: The exception is thrown using the keyword throw

_____________________________________________________________________

Question 3

Answer: The program displays NumberFormatException

Explanation: A string variable ‘s’ contains the value 8.3. This value can be converted to the float variable but in the method named method(), the lines of code trying to convert in the integer datatype.

_____________________________________________________________________

Question 4

Answer: Only exceptions of type RuntimeException

Explanation: In the catch block the written for the type RuntimeException. If the run time exception occurs, the related catch block will executes.

_____________________________________________________________________

Question 5

Answer: ClassCastException

Explanation: An object cannot be cast to the string.

_____________________________________________________________________

Question 6

Answer: You cannot have a try block without a catch block or a finally block

Explanation: As per the syntax the try block must followed by catch or final block.

_____________________________________________________________________

Question 7

Answer: The program will not compile because a throws clause is needed.

Explanation: The program will not compile because Exception is an unchecked exception.

_____________________________________________________________________

Question 8

Answer: throws is used in a method signature, throw is used to throw an exception

Explanation: The throws keyword is used to throw an exception it is written in a method signature.

_____________________________________________________________________

Question 9

Answer: Both the exceptions will be caught

Explanation: In a method named ‘aMethod()’ the arithmetic operation is done in between 1 and 0. If the denomination is zero then it raises the Athematic Exception and it is a runtime exception also. So both the exceptions will be caught.

_____________________________________________________________________

Question 10

Answer: The exception is propagated to the method that called the current method

Explanation: if the exception is not coughed then the exception will passed from the current method to the invoking method.

_____________________________________________________________________

Question 11

Answer: An object of a subclass can be assigned to a reference to its superclass without a type casting.

_____________________________________________________________________

Question 12

Answer: A final class cannot be extended

Explanation: A final class does not have abstract methods. Only an abstract class can have abstract methods.

_____________________________________________________________________

Question 13

Answer: c4 instance of C2

Explanation: From the given options c4 instance of C2 is false.

The class C4 extends C1 which states that all the properties of C1 can be used by C4. So c4 is not an instance of C2.

_____________________________________________________________________

Question 14

Answer: An abstract class can have ordinary methods but an interface cannot."

Explanation: An abstract class can have abstract methods and ordinary methods.

An interface can have ordinary methods.

_____________________________________________________________________

Question 15

Answer: Spec object3 = new Derived();"

_____________________________________________________________________

Question 16

Answer: Any non-abstract or abstract class

Explanation: An abstract class can have a constructor. The object for an abstract class is created by the anonymous subclass. The constructor of the abstract class is automatically invoked. Interface cannot have constructor.

_____________________________________________________________________

Question 17

Answer: b is an instance of A followed by b is an instance of C

_____________________________________________________________________

Question 18

Answer: abstract class A { abstract void unfinished(); }

Explanation:

Abstract is a special type of class that cannot be instantiated. Abstract methods are the methods declared without implementation.

_____________________________________________________________________

Question 19

Answer: A data field can be declared abstract

Explanation: Data fields are declared directly without using any abstract keywords.

_____________________________________________________________________

Question 20

Answer: It can only be used in subclasses

Explanation: The keyword ‘super’ is used in sub class to call the overridden method of super class or to call the constructor of super class.

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