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(#M40167114) JAVA QUESTION Java question Keep an EYE

What will be the output of the following program?

class A
{
public void test()
{
System.out.println("Class A");
}
}
class Trial extends A
{
public void test()
{
System.out.println("Class Trial");
}
public static void main(String args[])
{
Trial object = (Trial)new A();
object.test();
}
}

A. Runtime Error
B. Compile Time Error
C. Class A
D. Class Trial

Asked In Java Jax (3 years ago)

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(#M40167113) JAVA QUESTION instanceof question Keep an EYE

What will be the output of the program?

class Tree { }

class Pine extends Tree { }

class Oak extends Tree { }

public class Forest1
{
public static void main (String [] args)
{
Tree tree = new Pine();

if( tree instanceof Pine )
System.out.println ("Pine");

else if( tree instanceof Tree )
System.out.println ("Tree");

else if( tree instanceof Oak )
System.out.println ( "Oak" );

else
System.out.println ("Oops ");
}
}

A. Oops
B. Tree
C. Pine
D. Forest

Asked In Java Jax (3 years ago)

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(#M40167115) JAVA QUESTION Inheritance relationship in Java Keep an EYE

Which of the following statements are correct with respect to inheritance relationship in java?

A. object of subclass referenced by super class type can invoke super class methods
B. object of subclass referenced by super class type can access newly defined sub class variables
C. object of subclass referenced by super class type can access super class variables
D. object of subclass referenced by super class type can invoke overridden sub class methods
E. object of subclass referenced by super class type can invoke newly defined sub class methods

Asked In Java Jax (3 years ago)

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(#M40167117) JAVA QUESTION Access Modifiers Keep an EYE

Given a method in a public class, ________ access modifier must be used to restrict access to that method to only the other members of the same class.

A. final
B. private
C. protected
D. default

Asked In Java Jax (3 years ago)

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(#M40167119) JAVA QUESTION equals() vs == based question Keep an EYE

What is the output of the following program?

import java.util.Arrays;

class Test
{
public static void main(String args[])
{
String[] cities = new String[]{"London", "Paris", "NewYork", "HongKong", "Tokyo"};
String[] metros = new String[]{"London", "Paris", "NewYork", "HongKong", "Tokyo"};
String[] capitals = cities;
System.out.println("cities == metros : " + (cities == metros));
System.out.println("cities == capitals : " + (cities == capitals));
System.out.println("cities.equals(metros) : " + cities.equals(metros));
System.out.println("cities.equals(capitals) : " + cities.equals(capitals));
System.out.println("Arrays.equals(cities, metros) : " + Arrays.equals(cities, metros));
System.out.println("Arrays.equals(cities, capitals) : " + Arrays.equals(cities, capitals));
}
}


A. cities == metros : false
cities == capitals : true
cities.equals(metros) : true
cities.equals(capitals) : true
Arrays.equals(cities, metros) : false
Arrays.equals(cities, capitals) : true

B. cities == metros : false
cities == capitals : true
cities.equals(metros) : true
cities.equals(capitals) : true
Arrays.equals(cities, metros) : true
Arrays.equals(cities, capitals) : true

C. cities == metros : false
cities == capitals : true
cities.equals(metros) : false
cities.equals(capitals) : true
Arrays.equals(cities, metros) : true
Arrays.equals(cities, capitals) : true

D. cities == metros : false
cities == capitals : true
cities.equals(metros) : false
cities.equals(capitals) : true
Arrays.equals(cities, metros) : true
Arrays.equals(cities, capitals) : false

Asked In Java Jax (3 years ago)

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(#M40167127) JAVA QUESTION Checked vs Unchecked exceptions Keep an EYE

Which exceptions should be explicitly handled or properly propagated?

A. Unchecked exceptions
B. Checked exceptions
C. Errors
C. None of the above

Asked In Java Jax (3 years 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 (3 years ago)

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(#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 (3 years 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 (3 years ago)

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(#M40167104) DATA STRUCTURE QUESTION Which data structure is better for storing the sorted data? Keep an EYE

Which of the following data structure is better for storing the sorted data on which often insert and deletion operations are performed?

A. Linked list
B. Queue
C. Array
D. Doubly linked-list

Asked In DATA STRUCTURE Jax (3 years ago)

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