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Java interview questions and answers for freshers

(#M40167137) JAVA QUESTION Java polymorphism Keep an EYE

class Mammal
{
String name= "Dog";
String makeNoise()
{
return "Bow Wow";
}
}

class Cat extends Mammal
{
String name="Cat";
String makeNoise()
{
return "Meow";
}
}

public class Main
{
void go()
{
Mammal m = new Cat();
System.out.println(m.name + m.makeNoise());
}
public static void main (String[] args)
{
new Main().go();
}
}

What is the output of the above program?

A. CatMeow
B. DogBow Wow
C. DogMeow
D. CatBow Wow

Asked In Java Jax (7 Months ago)

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(#M40167136) JAVA QUESTION Checked vs unchecked Exceptions Keep an EYE

_____ exceptions are automatically propagated. To propogate _____ exceptions, the method should explicitly throw the exception using the throws keyword.

A. checked, unchecked
B. unchecked, checked

Asked In Java Jax (8 Months ago)

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(#M40167135) JAVA QUESTION Exceptions 3 Keep an EYE

Predict the output

import java.io.IOException;

public class Exception1{

public static void main(String[] args)

{

try

{

throw new IOException();

}

catch(IOException | Exception ex)

{

System.out.println(ex + " handled ");

}

}

}

A. program won't compile
B. runtime exception
C. program will compile
D. None of the above

Asked In Java Jax (8 Months ago)

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(#M40167134) JAVA QUESTION throw keyword Keep an EYE

What will be the output of the program?

public class RTExcept
{
public static void throwit ()
{
System.out.print("throwit ");
throw new RuntimeException();
}
public static void main(String [] args)
{
try
{
System.out.print("hello ");
throwit();
}
catch (Exception re )
{
System.out.print("caught ");
}
finally
{
System.out.print("finally ");
}
System.out.println("after ");
}
}

A. hello throwit caught finally after
B. Compilation fails
C. hello throwit RuntimeException caught after
D. hello throwit caught

Asked In Java Jax (8 Months ago)

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(#M40167133) JAVA QUESTION try, catch and finally Keep an EYE

Which of the given fact(s) are true with respect to the blocks and order of execution of blocks in "Exceptions"?

A. The try block can be followed by finally block and then followed by the catch blocks
B. One or more catch blocks which are exception handlers are placed immediately after the try block
C. Catch block has an argument which can accept an argument of any exception type and it is the name of a class that inherits from the Throwable class
D. The finally block always executes when the try block exits or when an exception occurs
E. The finally block is not executed when there is a return statement in the try block

Asked In Java Jax (8 Months ago)

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(#M40167132) JAVA QUESTION Exceptions 2 Keep an EYE

class ProductNotFoundException extends Exception {

//Some code

}

class Shop {

public void findProduct(int productId) throws ProductNotFoundException {

//some code

throw new ProductNotFoundException();

//some code

}

}

class ABCShop{

public void findProductsList(){

new Shop().findProduct(101);

}

}

Which of the following statement(s) are true for the above code?

A. This code will compile if we add throws ProductNotFoundException in the signature of method findProductsList().
B. This code will compile but returns no output
C. This code will compile if we add a try-catch block in findProductsList().
D. This code will compile if in method findProductsList () returns a list instead of void

Asked In Java Jax (8 Months ago)

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(#M40167131) JAVA QUESTION Exceptions Keep an EYE

Observe the code.

public class Sample {

public static void main(String args[]) {

int i=10,j=0,k;

try {

k=i/j;

}

catch(Exception e) {

System.out.println("Exception");

}

catch(ArithmeticException e) {

System.out.println("Arithmetic exception");

}

}

}

Predict the output.

A. ArithmeticException
B. Compilation Fails
C. Exception
ArithmeticException
D. Runtime exception

Asked In Java Jax (8 Months ago)

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(#M40167130) JAVA QUESTION finally block Keep an EYE

finally block will get executed whether or not an exception occurs. State True or False

Asked In Java Jax (8 Months ago)

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(#M40167129) JAVA QUESTION try, catch and finally Keep an EYE

Which of the following statement(s) are not true?

A. For each try block there can be zero or more catch blocks but only one finally block
B. Finally block will get executed whether or not an exception occurs.
C. A try block must be followed only by at least one catch block
D. A try block has multiple catch block, then those exception handlers can be in any order

Asked In Java Jax (8 Months ago)

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(#M40167128) JAVA QUESTION Exceptions Keep an EYE

Exception is an abnormal event or error that occurs during ________

A. Runtime
B. Compile time
C. any time - unpredictable
D. Any of these options

Asked In Java Jax (8 Months ago)

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