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Computer Programming 2

Showing 1-75 of 146 answers

__________ is implemented in at least two classes with inheritance relationship.

Inheritance
None of the options
Overriding Correct
Polymorphism
Overloading

Can we directly compile codes from NetBeans?

It depends, if there is a compiler embedded in NetBeans
No, we can only write codes in NetBeans
Yes, because we can call Java compiler from NetBeans Correct
Both A and C are correct

Can we directly compile codes from notepad?

Yes, Because we can call Java compiler from notepad
It depends, if there is a compiler embedded in Notepad
Both A and C are correct
No, We can only write codes in Notepad Correct

Declare a two-dimensional integer array named values of size 6 columns and 4 rows.

int[ ][ ] values=new int[4][6]; Correct
int[ 6][4 ] values=new int;
int values=new int[6][4];
int[ ][ ] values=new int[6][4];
None of the above

Declare and initialize a double data type array named numbers with the following values: 23.35, 34.45, 56.77.

double[ ] numbers={2335, 3445, 5677}; Correct
double[ ] numbers={"2335, 3445, 5677"};
None of the choices
double[3] numbers={2335, 3445, 5677};
Double[ ] number={2335, 3445, 5677};

From the array int[] intArray = { 1, 2, 3, 5, 6, 7 };, what is the value of intArray[2]?

3 Correct

From the array int[] intArray = { 1, 2, 3, 5, 6, 7 };, what is the value of intArray[3]?

5 Correct

How many elements could be assigned to an array location with 5 columns and 3 rows?

5
15 Correct
8
3
None of the choices

It is a template for creating an object?

None of the above
Object Oriented
Method
Class Correct
Encapsulation

It is the ability of an object to have many forms?

Abstraction
Polymorphism Correct
Inheritance
Interface
None of the above

It is the method of hiding certain elements of the implementation of a certain class?

Encapsulation Correct
Class
Object
None of the above
Object Oriented

It is used to access the instance variables shadowed by the parameters.

this Correct

It used to read values from class variables?

Accessor Correct

JVM is responsible for

Generating bytecode
None of the Above
Compiling source code
Interpreting bytecode Correct
Reading bytecode

Multiple-Choice. Please select the best answer for the question. What will be the result if you execute this expression x=true ? 1 : 0;?

1 Correct
0
false
true
none of the above

Multiple-Choice. Please select the best answer for the question.What will be the value of x after you execute this statement int z=0; for(int x=0; x<10; x++) for(int y=0; y<x; y++) z*=(x*y);?

236
128
512
None of the above Correct
1

Multiple-Choice. Please select the best answer for the question.Which is not a decision control structure?

switch
if else-if else
if else
None of the above Correct
if

Multiple-Choice. Please select the best answer for the question.Which is not a repetition control structure?

loop Correct
None of the above
do-while
for
while

Multiple-Choice. Please select the best answer for the question.Which of the following a valid Java identifier?

$id
id
id_1
all of the above Correct
_id

Multiple-Choice. Please select the best answer for the question.Which of the following has the correct form for an if statement?

none of the above
if boolean_expression
if { boolean_expression }
boolean_expression
if (boolean_expression) Correct

Multiple-Choice. Please select the best answer for the question.Which of the following is not a Java Literal?

Boolean value
Integer value
None of the above Correct
Float value
Character value

Multiple-Choice. Please select the best answer for the question.Which of the following is not a primitive data type?

none of the above
int
byte
String Correct
double

Multiple-Choice. Please select the best answer for the question.Which statement will check if x is less than y?

if (x>y)?:
if (x<=y)
if (x<y); Correct
none of the above
if (x>y)

Since Java uses a virtual machine, what does that mean about the versatility of Java?

None of the Above
It can run most anywhere without modification Correct
Code Security
It is used almost exclusively on Intel platforms
It will run on Windows, Linux, Unix, but not Apple

The __________ keyword allocates memory for the array being declared.

new Correct
array
int
intArray
None of the above

The feature of Java which makes it possible to execute several tasks simultaneously.

Multithreaded Correct

The Java feature, "write once, run anywhere", is termed as

Object Oriented
None of the Above
Platform independent Correct
High Performance
Robust

The length of an array is established when the array is created at __________.

None of the above
runtime Correct
initialization
compile time
declaration

True or False. Please select the best answer for the question.byte, short, int, and for are one of Java's Primitive data types.

True
False Correct

True or False. Please select the best answer for the question.float is one of Java's Primitive data types

True Correct
False

True or False. Please select the best answer for the question.for, while and do-while is part of Java's Repetition Control Structures

True Correct
False

True or False. Please select the best answer for the question.Java is a simple, object-oriented, portable and robust computer language.

True Correct
False

True or False. Please select the best answer for the question.Java is architecture neutral

True Correct
False

True or False. Please select the best answer for the question.Java is secured

True Correct
False

True or False. Please select the best answer for the question.Java SE is a Java Platform

True Correct
False

True or False. Please select the best answer for the question.Java's control structures are branching, decision, and multithreaded.

True
False Correct

True or False. Please select the best answer for the question.Portable is one of Java's control structures

True
False Correct

True or False. Please select the best answer for the question.Repetition is one of Java's control structures

True Correct
False

Use the __________ statement when traversing through arrays.

whilewhile loop
switch
do-while loop
for loop Correct
none of the choices

What did java generates after compiling the java source code?

Byte Code Correct

What do you call a blueprint of an object?

Object
None of the above
Class Correct
Constructor
Method

What do you call a class that inherits a class?

Parent class
Class
Superclass
Subclass Correct
None of the above

What do you call a variable that belong to the whole class?

None of the above
Class Variable Correct
Class Method
Static Variable
Object Variable

What does Java generate after compiling the java source code?

Class Code
Image file
Executable file
None of the Above
Byte Code Correct

What is floating-point literal?

Can be express in scientific notation
All of the above Correct
An integer literal with decimal point
By default it is double type
It could be double or float value

What is the correct statement to compile Java program in command line?

javac HelloWorld
java HelloWorldjava
javac HelloWorldjava Correct
java HelloWorld

What is the correct statement to run Java program in command line?

None of the Above
java HelloWorld Correct
javac HelloWorldjava
java HelloWorldjava
javac HelloWorld

What is the correct statement to set javac path in command line?

None of the Above
set path=C:\Program Files\Java
All of the above
javac
set path
C:\Program Files\Java\jdk160_23\bin
path=C:\Program Files\Java\jdk160_23\bin Correct

What is the extension name of a Java Source code?

j
None of the Above
java Correct
class
javac

What is the index number of the last element of an array with 20 elements?

19 Correct

What is the index number of the last element of an array with 30 elements?

29 Correct

What is the input for Java Compiler?

Code
Byte Code
Native Code
Source Code Correct
None of the Above

What is the length of the array: int[] intArray = { 1, 2, 3, 5, 6, 7 };

6 Correct

What is the maximum index of the array: int[] intArray = { 1, 2, 3, 5, 6, 7 };

5 Correct

What is the name of this method: int test(){return 1;} ?

7
None of the choices
int
6
test Correct

What is the output of the code snippet below: int[] intArray = { 1, 2, 3, 5, 6, 7 }; for(int x = intArray.length-1; x>=0; x--){System.out.print(intArray[x]);}

765321 Correct
12356
123567
The given code is not valid
none of the choices

What is the output of the code snippet below: int[] intArray = new int[10];for(int x = 0; x<intArray.length; x++){System.out.print(intArray[x]);}

0000000000 Correct
012356789
The given code is not valid
1235678910
none of the choices

What is the output of the code snippet below: void main(){test(=E2=80=9C11=E2=80=9D);test(=E2=80=9C1=E2=80=9D);} void test(String x){System.out.print(x + x);}

222
111111 Correct
6
None of the choices

What is the output of the code snippet below: int[] intArray = { 1, 2, 3, 5, 6, 7 }; for(int x = intArray.length-1; x>=0; x--){System.out.print(intArray[x]);}

765321 Correct

What is the output of the code snippet below: int[] intArray = new int[10]; for(int x = 0; x <intArray.length; x++) {System.out.print(intArray[x]);}

0000000000 Correct

What is the output of the code snippet below: void main(){test(“11”);test(“1”);} void test(String x){System.out.print(x + x);}

111111 Correct

What is the output of the code snippet below: void main(){test();test();} void test(){System.out.print(“1”);}

11 Correct

What is the output of the code snippet below: void main(){test();test();} void test(){System.out.print(=E2=80=9C1=E2=80=9D);}

2
11 Correct
3
1
None of the choices

What is the output of the code snippet below: void main(){test(1.0); test(1);} void test(double x){ System.out.print(x); } void test(int x){ System.out.print(x);}

1.01 Correct

What is the output of the code snippet below:void main(){test(1.0);test(1);}void test(double x){System.out.print(x); }void test(int x){System.out.print(x);}

1010
None of the choices
11
10
101 Correct

What is the result if we execute this: “a” instanceof String; ?

true Correct

What is the result if we execute this: “a”.equals(“a”);?

true Correct

What is the result if we execute this: =E2=80=9Ca=E2=80=9D instanceof String; ?

The code is not valid
false
true Correct
=E2=80=9Ca=E2=80=9D
None of the above

What is the result if we execute this: =E2=80=9Ca=E2=80=9D.equals(=E2=80=9Ca=E2=80=9D);?

false
=E2=80=9Ca=E2=80=9D
true Correct
None of the above
The code is not valid

What is the return type of this method: int test(){return 1;} ?

test()
1
None of the above
void
int Correct

What is the return value of this method: int test(){return 1;} ?

test
All of the choices
int
return 1
1 Correct

What is the return value of this method: public void sum(){int x=1;} ?

1
sum
none of the choices
void Correct
x

What keyword is used to perform class inheritance?

extends Correct
derives
inherits
implements
None of the above

What type of value does the nextLine() returns?

None of the above
Line
double
String Correct
long

What was the initial name for the Java programming language?

Oak Correct