UAB CS 203 Final Exam 2023

public static void main(String args [ ]) { int i = 0 do { System.out.println( i ); i++; } while ( i > 5 ); } Whats the output

0

how many classes should have a main method

1

whats the proper notation for two conditions both being true

&&

Where can local variables be accessed?

Inside the method or block that they are defined in

Which is true about abstract classes

It forces programmers to override a method

What is used to run the bytecode on each platform

Java Virtual Machine

whats the correct way to create an object called myObj of MyClass

MyClass myObj = MyClass( );

Is white space important in Java

NO

A method should be an accessor or mutator but not both

True

A static variable belongs to the class, not an object of the class

True

Accessor method does not change data

True

Accessor method does not change the internal data of the object on which it is invoked

True

An immutable has no mutator methods

True

Every Variable in java needs a data type

True

Java supports multilevel inheritance

True

Method overloading is a feature of OOPs which makes it possible to give the same name to more than one method within a class if the arguments passed differ

True

There is no need to create the object to call the static methods

True

do - while loops are guaranteed to run at least once

True

in the OOP concept, data and code are bound together by encapsulation

True

variables should usually be private

True

when we extend a superclass we have a choice whether or not to override the methods of the superclass

True

which is not true about JUnit Testing

Unit testing mean testing one java file at a time

what can be used instead of switch - else statement

if - else

which statement is not an access modifier in java

inherited

Constructors are used to

initialize a newly created object

keyword used for checking a reference variable for a type of object reference

instanceof

how to create a variable with an int of 5

int x=5;

which object is not a primitive type

object

When a child class declares a method that has the same type arguments as a method declared by its parent class is called

overriding

You have two methods in the parent class public void method1( ) { ... } private void method2( ) { ... } which is not possible with inheritance

private void method1( ) { ... }

what is NOT true about constructors

return type is always int

Whats a keyword that accesses the methods or member variables of the parent class

super

what refers to the object a method is being called on

this

In JAVA, you can compare an int with a boolean variable

False

In Java, you declare the type of a variable in your code, and you can change the type of that variable later

False

Instance variables belong to the class not any specific object

False

It is good practice for instance variables to be public

False

Java doesn't support multidimensional arrays

False

Java is short for JavaScript

False

Mutator methods dont change the data of the object

False

String is mutable

False

The value of a string can be surrounded by single quotes

False

public class Faculty extends UABEmployee,Researcher{ } is the correct to make a subclass

False

we can change the argument list of an overriding method

False

we can inherit from multiple abstract classes

False

we can only construct one object per class

False

we can store the integer values inside an arraylist using the following code Arraylist <int>

False

whats the output to this code public static void main(String[ ] args) { String str1 = new String("CS203"); String str2 = new String("CS203"); System.out.println(str1 == str2); }

False

This operation yields true if either or both of of the operands are true

II

what is the result of the code int num = 6.45

error

Abstract class is a OOP concept where one object can have many forms

False

Abstract classes can be instantiated

False

a template needs to be defined for a group ofsubclasses (for example, Animal should be an abstract superclass) What should you use?

Abstract class

which OOP concept forces programmers to override a method

Abstract classes

What does API stand for

Application Programming Interface

what is an unordered sequence that stores references to objects

Arraylist

If class B inherits from class A which of the following cannot be said

B has access to private methods in class A

Is Java an interpreted language or a compiled language?

Compiled

All inner classes types

Nested inner class method local inner class anonymous inner class static nested inner class

which is a good class name

Number

What is the base class of all classes in Java

Object

which statement is not true

References are mutable

we have superclass "Asset" and subclasses "Stock", "Bond", "Savings". What is not possible

Savings obj4 = new Asset( );

what class allows the user to input data from their keyboard

Scanner

Which data type is used to create a variable that should store text

String

A derived Class automatically has all the instance variables and public methods that the base Class has, and it can have additional methods and/or instance variables as well

True

what is true about a public access modifier

Variables, methods and constructors that are declared public can be accessed by any class

Can an Object have more than one type of Data?

Yes

to declare an array in java, define the variable type with

[ ]

inner class

a class that is part of another class or method

what identifier sets a variable as True or False

boolean

which statement is used to stop a loop

break

what is the output of a Java program called

bytecode

what keyword is used to create a class om Java

class

Abstraction hides what

complexity

In Java, how do you get a for loop to skip a current iteration under certain conditions

continue

Overriding

where two methods have the same name AND the same parameter types, but the implementation has been changed in the subclass

Overloading

where two methods have the same name BUT different parameter types. which the implementation changes based on the type of the parameter

What is not true about inheritance in Java

you can inherit from multiple classes at the same time

which is true

you must initialize local variables