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

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 three times followed by End of the block.

The program displays Welcome to Java three times.

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

The program displays Welcome to Java two 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 unchecked exception that can be thrown by the method is not caught

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

Whenever any checked exception can be thrown by the method

Whenever any 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 RuntimeException

The program has a compilation error

The program displays NumberFormatException followed by After the method call

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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 superclasses

Exceptions of type RuntimeException and any of its subclasses

Any exception

Only exceptions of type RuntimeException

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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:

No exception

StringIndexOutOfBoundsException

ArithmeticException

ClassCastException

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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

Nothing is wrong

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

You cannot have a try block without a catch 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 parseInt could throw NumberFormatException and it is never caught

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

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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:

Either one can be used to throw an exception

The two reserved words are interchangeable

throw is a reserved word, but throws is not

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:

Only the RuntimeException will be caught

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

The program will no longer compile

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 program always terminates and displays an error message

The exception is ignored

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

The exception is rethrown

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

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

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Question 12 (5 points)

Which of the following statements about final classes is correct?

Question 12 options:

A final class cannot have any instances

A final class cannot be extended

A final class cannot have a constructor

A final class must have all abstract methods

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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:

It is possible to create an instance of an abstract class

An abstract class cannot have any constructors

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:

Derived object5 = new Spec();

Derived object2 = new Base();

Spec object3 = new Derived();

Spec object4 = new Base();

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Question 16 (5 points)

Which of the following can contain a constructor?

Question 16 options:

Any abstract class or interface

Any nonabstract class or interface

Any class or interface

Any nonabstract or abstract class

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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:

Nothing

b is an instance of C

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:

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

class 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:

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

A data field can be declared abstract

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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 constructor

It can only be used in subclasses

It can only be used in superclasses

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

 

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