Choose the correct statement related to the constructors.

Constructor is a block of codes similar to the method. It is called when an instance of the class is created

Constructor is a special type of method that is used to initialize default members of the object only

Constructor is an abstract method with an empty body

Constructor is a method that does not allow parameters

Choose the correct statement about the "this" keyword.

It can be used to refer to the current object in a method or constructor

It can be used to refer to the object of the superclass

It can be used to invoke methods of the superclass

What is the purpose of the "super" keyword in Java?

To call the constructor or methods of the parent class

To call the constructor or methods of the child class

To call the members of the same class

What is a superclass in Java inheritance?

The class from which the subclass is derived

The class that inherits from another class

The final class in the inheritance chain

The class that has abstract methods

Which method is called first when an object of a subclass is created in Java?

The constructor of the superclass

The constructor of the subclass

Choose multiple correct answers. Choose 2 answers.

private access modifier should be used for a variable or method to only be accessed within the same class

public access modifier should be used for a variable or method that should be accessible from any class, regardless of the package

protected access modifier should be used for a variable or method that should only be accessed within the same class and subclasses, in the same package

default (no modifier) access modifier only allows access in the same class

Choose multiple correct answers. Choose 3 answers.

The purpose of a getter method in Java is to get the value of a variable

The purpose of a setter method in Java is to set the value of a variable

Access modifiers often used for getter or setter method is public

return keyword used to define getter and setter method in Java

Choose the correct statement about the anonymous class.

An anonymous class can be used to implement an interface

Anonymous class used to extend methods

Anonymous class is used to define a set of constants

What is the output of the following code snippet: int i=0; int[] list={1,2,3,4,5); list[i]+=++i; do{ }while(i

The program will raise an exception.

Which of the following is the best description of polymorphism?

It is the ability for a message/data to be processed in more than one form.

It is the ability for many messages/data to be processed in one way

It is the ability for a message/data to be processed in only one form

Can we add a duplicated element into a Set in Java?

No, if we add a duplicated element into a Set, the Set will keep the old element and remove the new one.

No, the procedure will raise an exception

Yes, we can add a duplicated element into a Set and the Set will keep the new element and remove the old one

Yes, we can add a duplicated element into a Set and the Set will maintain 2 elements including the old element and the duplicated one

Choose correct answer about anonymous class?

A class that is defined without a name and can be instantiated only once

The purpose of using an anonymous class is to provide a way to implement an interface or extend a class without explicitly defining a named class.

An anonymous class is created using the "new" keyword followed by the name of the interface or class being implemented or extended.

Anonymous classes are like local classes except that they do not have a name.

Which of the following statements about the low-level stream and the high-level stream is true?

The low-level stream's data unit is a byte, high-level stream's data unit is a primitive type.

The low-level stream's data unit is character UTF-8, high-level stream's data unit is character UNICODE.

The low-level stream's data unit is a character type, high-level stream's data unit is an object type.

The low-level stream's data unit is primitive, high-level stream's data unit is character.

Java Programming Quiz

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Computers

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Hard

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