Java Exception Handling online test 3, Java Exception Handling Mock test

Java Exception Handling Test 3 - Java Question and Answers

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Question 1 of 17

1. Question

What will be the output?

public class Test6{
public static void main(String args[]) throws Exception{
try{
throw new Exception();
}
finally{
System.out.println(“No Error”);
}
}
}

Choose the one below:

No Error
java.lang.Exception followed by No Error
No Error followed by java.lang.Exception
Compiler Error

Correct

finally block is executed everytime. The only way to escape finally is to call System.exit().

Hence the above code snippet will print “No Error” followed by java.lang.Exception.

Incorrect

finally block is executed everytime. The only way to escape finally is to call System.exit().

Hence the above code snippet will print “No Error” followed by java.lang.Exception.

Question 2 of 17

2. Question

What will be the output?

public class Test9 extends A{
public static void main(String args[]) throws Exception{
Test9 t = new Test9();
}
}
class A{
A() throws Exception{
System.out.println(“A Class”);
}
}

Choose the one below:

A Class
Compiler Error
no output
Runtime Exception

Correct

The constructor must either catch the exception thrown by the superclass’s constructor or it must declare that it throws that same exception (or a superclass of that exception).

In the above code snippet the default constructor neither catch the exception thrown by super class default constructor nor declare that default constructor throws exception. Hence it will give compile time error.

Incorrect

The constructor must either catch the exception thrown by the superclass’s constructor or it must declare that it throws that same exception (or a superclass of that exception).

Question 3 of 17

3. Question

What will be the output?

public class Test9 extends A{
Test9() throws IOException{
System.out.println(“Test9 Class”);
}
public static void main(String args[]) throws Exception{
Test9 t = new Test9();
}
}
class A{
A() throws Exception{
System.out.println(“A Class”);
}
}

Choose the one below:

no output
A Class
Runtime Exception
Compiler Error

Correct

The constructor must either catch the exception thrown by the superclass’s constructor or it must declare that it throws that same exception (or a superclass of that exception). In the above code snippet Test9() throws exception which is subclass of Exception class and its superclass constructor is throwing Exception exception.

Hence the above code will give compile time error.

Incorrect

Hence the above code will give compile time error.

Question 4 of 17

4. Question

What will be the output?

public class Test10 extends A{
Test10()throws Exception{
System.out.println(“Test10 Class”);
}
public static void main(String args[]) throws Exception{
Test10 t = new Test10();
}
}
class A{
A() throws Exception{
System.out.println(“A Class”);
}
}

Choose the one below:

no output
Runtimxception
Compiler Error
A Class Test10 Class

Correct

The constructor must either catch the exception thrown by the superclass’s constructor or it must declare that it throws that same exception (or a superclass of that exception). The above code snippet handles the exception properly in subclass constructor resulting successful compilation and results A Class Test 10 Class on the console.

Incorrect

The constructor must either catch the exception thrown by the superclass’s constructor or it must declare that it throws that same exception (or a superclass of that exception). The above code snippet handles the exception properly in subclass constructor resulting successful compilation and results A Class Test 10 Class on the console.

Question 5 of 17

5. Question

What will be the output?

public class Main extends A{
Main() throws Exception{
System.out.println(“Main Class”);
}
public static void main(String args[]) throws Exception{
Main t = new Main();
}
}
class A{
A() throws Exception{
System.out.println(“A Class”);
}
}

Choose the one below:

Compiler Error
A Class Main Class
Runtimxception
no output

Correct

In the above code snippet Main t = new Main(); invokes Main() constructor which inturn calls super() as first statement and invokes A() constructor; Resulting A class Main class on the console.

Incorrect

Question 6 of 17

6. Question
Which of the following lists exception types from MOST specific to LEAST specific?
- Throwable, RunTimeException
- ArithmeticException, RunTimeException
- Error, Exception
- Exception, RunTimeException
Correct

The Exception Hierarchy in Java can be represented as:-

Hence from the above options it is clear that ArithmeticException, RunTimeException is the correction option.

Note:- Moving Top to down in the hierarchy makes exception class more specific whereas down to top makes class more generialize.

Incorrect

The Exception Hierarchy in Java can be represented as:-

Hence from the above options it is clear that ArithmeticException, RunTimeException is the correction option.

Note:- Moving Top to down in the hierarchy makes exception class more specific whereas down to top makes class more generialize.
Question 7 of 17

7. Question
On occurrence of which of the following is it possible for a program to recover?
- Errors
- Exceptions
- Both errors and exceptions
- Neither
Correct

An exception is an event that occurs during the execution of a program that disrupts the normal flow of instructions and it can be recovered whereas recovery from an Error is not possible & the program should be allowed to terminate. Examples include OutOfMemoryError, StackOverflowError, etc.

Incorrect

An exception is an event that occurs during the execution of a program that disrupts the normal flow of instructions and it can be recovered whereas recovery from an Error is not possible & the program should be allowed to terminate. Examples include OutOfMemoryError, StackOverflowError, etc.

Question 8 of 17

8. Question

What will be the output?

Choose the one below:

public class Test4{
public void method(){
System.out.println(“”Called“”);
}
public static void main(String[] args){
Test4 t4 = null;
t4.method();
}
}

“Called”
Runtime Exception
Compile Time Error
Nothing is printed in screen

Correct

In the above code snippet refernce variable t4 has not been initialized and when t4.method() will be called it will give NullPointerException at runtime.

Incorrect

In the above code snippet refernce variable t4 has not been initialized and when t4.method() will be called it will give NullPointerException at runtime.

Question 9 of 17

9. Question
Exceptions can be caught or rethrown to a calling method.
- TRUE
- FALSE
Correct

In Java exception can be caugth or rethrown from catch block by adding some extra information(Custom Exception) as per requirement.

For example:-

try
{
//Your Code Here
}
catch (Exception e)
{
throw new YourOwnException(e);
}

Incorrect

In Java exception can be caugth or rethrown from catch block by adding some extra information(Custom Exception) as per requirement.

For example:-

try
{
//Your Code Here
}
catch (Exception e)
{
throw new YourOwnException(e);
}

Question 10 of 17

10. Question

class A {
public static void main (String[] args) {
Object error = new Error();
Object runtimeException = new RuntimeException();
System.out.print((error instanceof Exception) + “,”);
System.out.print(runtimeException instanceof Exception);
}
}

What is the result of attempting to compile and run the program?

Prints: false,true
Prints: true,false
Prints: false,false
Prints: true,true

Correct

instanceof operator checks whether the object is of specified type i.e class or subclass or interface.

Hence output of above code snippet is: “false,true“

Incorrect

instanceof operator checks whether the object is of specified type i.e class or subclass or interface.

Hence output of above code snippet is: “false,true“

Question 11 of 17

11. Question

Given the following:

public class TestDivide {
public static void main(String[] args) {
int value=0;
try {
int result = 10/value;
} finally {
System.out.println(“f”);
}
}
}

What is the result ?

Compilation fails since a catch block is not present.
Prints only "f" in the output.
Prints an "f" in the output and a runtime error is also displayed.
Only a runtime error is displayed.

Correct

The above code will give ArithmeticException when line 5 is executed and then finally block will executed which will print “f” followed by exception on console.

Incorrect

The above code will give ArithmeticException when line 5 is executed and then finally block will executed which will print “f” followed by exception on console.

Question 12 of 17

12. Question

Given:

public class TestException {
public static void main(String… args) {
try {
// some piece of code
} catch (NullPointerException e1) {
System.out.print(“n”);
} catch (RuntimeException e2) {
System.out.print(“r”);
} finally {
System.out.print(“f”);
}
}
}

What is the output if NullPointerException occurs when executing the code in the try block?

Correct

If NullPointerException occurs it will be caught by catch block at line 5 and then finally block will be executed resulting “nf” on cconsole.

Incorrect

If NullPointerException occurs it will be caught by catch block at line 5 and then finally block will be executed resulting “nf” on cconsole.

Question 13 of 17

13. Question
Which exception occurs when you try to parse invalid integer using parseInt() function?
- IllegalArgumentException
- ClassCastException
- IllegalStateException
- NumberFormatException
Correct

If parseInt() method gets illegal data which cannot be parsed to Integer it throws NumberFormatException exception.

Incorrect

If parseInt() method gets illegal data which cannot be parsed to Integer it throws NumberFormatException exception.

Question 14 of 17

14. 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”);
}
}
}

-try-finally
-try-catch
-try
-try-catch-finally

Correct

finally block is executed everytime. The only way to escape finally is to call System.exit(). Hence when above code snippet is executed first try block is executed and then finally block gets executed resulting -try-finally on the console.

Incorrect

Question 15 of 17

15. Question
What exception might a wait() method throw?
- ForceShutHookException exception
- InterruptedException exception
- UninterruptedException exception
- ResourceLocked exception
Correct

wait() method may throw checked exception i.e. InterruptedException. Hence any method using wait() method should surround it with try-catch block or should declare throws InterruptedException in method signature.

Incorrect

wait() method may throw checked exception i.e. InterruptedException. Hence any method using wait() method should surround it with try-catch block or should declare throws InterruptedException in method signature.
Question 16 of 17

16. Question
Which of the following statements about an overridden method is false?
- An overridden method can declare to throw more checked exceptions than the base class method
- An overridden method can declare to throw less checked exceptions that the base class method.
- An overridden method can throw less runtime (unchecked) exceptions than the base class method.
- An overridden method can declare to throw no exceptions compared to the base class method
Correct

An overridden method can declare to throw less checked exceptions that the base class method.

An overriding method can throw any unchecked exceptions, regardless of whether the overridden method throws exceptions or not. However, the overriding method should not throw checked exceptions that are new or broader than the ones declared by the overridden method. The overriding method can throw those checked exceptions, which have less scope than the exception(s) declared in the overridden method.

Incorrect

An overridden method can declare to throw less checked exceptions that the base class method.

An overriding method can throw any unchecked exceptions, regardless of whether the overridden method throws exceptions or not. However, the overriding method should not throw checked exceptions that are new or broader than the ones declared by the overridden method. The overriding method can throw those checked exceptions, which have less scope than the exception(s) declared in the overridden method.

Question 17 of 17

17. Question

What will be the output of the following code snippet?

class Exception{
public static void main(String args[]){
try{
int a[]=new int[1];
a[1]=30/0;
a[2]=50;
}
catch(ArithmeticException e)
{System.out.println(“Exception1”);}
catch(ArrayIndexOutOfBoundsException e)
{System.out.println( “Exception2”);}
System.out.println(“rest”);
}
}

Exception1 Exception2
Exception2 rest
Exception1 Exception2 rest
Exception1 rest

Correct

The output of above code snippet will be

Exception1

rest

AS we know first the evaluation is done and then assignment happens. First 30/0 is evaluated and it throws ArithmeticException.

Incorrect

The output of above code snippet will be

Exception1

rest

AS we know first the evaluation is done and then assignment happens. First 30/0 is evaluated and it throws ArithmeticException.

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