7477171
Descripción
Test por Joseph Jimenez, actualizado hace más de 1 año
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Creado por Joseph Jimenez
hace casi 8 años
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Pregunta 1
Pregunta
System.out.println or next.Int( ) or close( ) are examples of:
Respuesta
-
syntax
-
variable
-
method
-
object
Pregunta 2
Pregunta
In the following sample code, how do you best describe the "Scanner":
public class squares {
public static void main(String[] args) {
java.util.Scanner scanner = new java.util.Scanner(System.in);
int num = 0;
System.out.print("Please enter a number: ");
num = scanner.nextInt();
scanner.close();
Respuesta
-
statement
-
method
-
object
-
argument
Pregunta 3
Pregunta
In the sample code below, what best describes num ?
public static void main(String[] args) {
java.util.Scanner scanner = new java.util.Scanner(System.in);
int num = 0;
int result = 0;
System.out.print("Please enter a number: ");
num = scanner.nextInt();
result = num * num;
scanner.close();
}
}
Respuesta
-
string
-
statement
-
variable
-
object
Pregunta 4
Pregunta
All is (are) true of pseudocode except:
Respuesta
-
comments that are understood by people
-
recognized by the compiler
-
a tool programmers use when creating a model of the program
Pregunta 5
Pregunta
string literals.
– char literals are enclosed in [blank_start]single[blank_end] quotes.
- [blank_start]String[blank_end] literals are enclosed in double quotes
Respuesta
-
single
-
String
Pregunta 6
Pregunta
How do you assign a variable?
Respuesta
-
use an = sign
-
In order to store a value in a variable, an assignment statement must be used
-
Both are correct
Pregunta 7
Pregunta
This program asks to simply input a word or "string" and the output is the first character of the word (so an input of agents, the program's output is "a")
java.util.Scanner scanner = [blank_start]new java.util.Scanner(System.in);[blank_end]
[blank_start]System.out.print[blank_end]("Enter a character: ");
char inputChar = [blank_start]scanner.next().charAt(0);[blank_end]
System.out.println("You have entered: "+inputChar);
[blank_start]scanner.close();[blank_end]
Respuesta
-
new java.util.Scanner(System.in);
-
System.out.print
-
scanner.next().charAt(0);
-
scanner.close();
Pregunta 8
Pregunta
What is wrong with the following code:
System.out.println("The quick brown fox" + "jumped over the \n" "slow moving hen.");
Respuesta
-
there are extra " " between \n and slow
-
use of the "+" is not correct
-
nothing is wrong with the code and should print "jump over the \n slow moving hen
Pregunta 9
Pregunta
which is NOT a valid statement
Respuesta
-
*/comment 3/*
-
//comment 1
-
/**comment 4*/
Pregunta 10
Pregunta
Which of the following will fix the code below:
final int x = 22, y = 4;
y += x;
System.out.println("x = " + x + ", y = " + y);
Respuesta
-
change y+=x; to y = y + x
-
remove "final" because this makes the "int x" a constant
-
nothing is wrong with the code
Pregunta 11
Pregunta
How can you output quotation marks around green ("green") in the System.out.println() method:
Respuesta
-
System.out.println("\green\")
-
System.out.println(\"green\")
-
System.out.println(\\"green"\\)
Pregunta 12
Pregunta
In the JAVA language, fill in what best coincides with the given term
Classes: [blank_start]PascalCase[blank_end]
[blank_start]Methods/Variables[blank_end]: camelCase
[blank_start]Constants[blank_end]: CAPS_UNDERSCORE
Respuesta
-
PascalCase
-
Methods/Variables
-
Constants
Pregunta 13
Pregunta
How do you define a method?
Respuesta
-
public.java.util.scanner = scanner()
-
public returnType methodName(arg1Type, arg2Type,...) { }
-
import java util.*;
Pregunta 14
Pregunta
In the following code, System.out.println(num) is an example of:
double num = 5.4;
System.out.println(num);
num = 0.0;
Respuesta
-
class method
-
value returning method
-
void method
Pregunta 15
Pregunta
If method A calls method B, and method B calls method C, and method C calls method D, when method D finishes, what happens?
Respuesta
-
the program terminates
-
control is returned to C
-
control is returned to A
Pregunta 16
Pregunta
When an argument is passed to a method:
Respuesta
-
values may not be passed to the method
-
its value is copied into the method's parameter variable
-
its value may not be changed within the call method
Pregunta 17
Pregunta
In the following code, Integer.parseInt(str), is an example of:
int num;
string str = "555";
num = Integer.parseInt(str) + 5;
Respuesta
-
void method
-
value returning method
-
complex method
Pregunta 18
Pregunta
If chr is a character variable, which of the following if statements is written correctly?
Respuesta
-
if(char = 'a')
-
if (char == 'a')
-
If(char=="a")
Pregunta 19
Pregunta
[blank_start]Short-circuit evaluation[blank_end] works like this: If the expression on the left side of the && operator is false, the expression the right side will not be checked.
Respuesta
-
Short-circuit evaluation
Pregunta 20
Pregunta
To do a case insensitive compare which of the following could be used to test the equality of two strings, str1 and str2?
Respuesta
-
str1.equalsIgnoreCase(str2)
-
str1.compareToIgnoreCase(str2) == 0
-
Both
Pregunta 21
Pregunta
What would be the value of x after the following statements were executed?
int x = 10;
switch (x)
{
case 10:
x += 15;
case 12:
x -= 5;
break;
default:
x *= 3;
}
Respuesta
-
20
-
30
-
15
Pregunta 22
Pregunta
What will be displayed to the screen with the following statements?
System.out.print("$%,.4f", 4452.34246);
Respuesta
-
$4,452.34246
-
4452.34246
Pregunta 23
Pregunta
What will be the value of x after the following code is executed? If the code has any kind of syntax error, please type in the answer “error”.
int x = 10
if (x>5) {
x /= 10;
}
if (x<5) {
x += 5;
}
if (x > 10) {
x -=4;
}
else {
x+=4;
}
Respuesta
-
10
-
0
-
12
Pregunta 24
Pregunta
An if statement's alternative path is implemented with _______.
Respuesta
-
switch
-
else
-
if
Pregunta 25
Pregunta
The part of a method that is a collection of statements that are performed when the method is executed is called the method _______.
Respuesta
-
body
-
arguments
Pregunta 26
Pregunta
When a primitive data type argument is passed to a method, it is passed by _______.
Respuesta
-
reference
-
value
Pregunta 27
Pregunta
When an object, such as a String, is passed as an argument, it is passed by
Respuesta
-
value
-
reference
Pregunta 28
Pregunta
What will be the values of x and y as a result of the following code?
int x = 25, y = 8;
x += y++;
Respuesta
-
x = 33; y = 9
-
x=34; y = 9
Pregunta 29
Pregunta
What will be printed after the following code is executed?
for (int number = 5; number <= 15; number +=3)
System.out.print(number + ", ");
Respuesta
-
5, 8, 11, 14, 17
-
5, 8, 11, 14
Pregunta 30
Pregunta
UML diagrams does contain
Respuesta
-
field names
-
object names
Pregunta 31
Pregunta
Unified Modeling Language which is used in object oriented software engineering.
Respuesta
-
using the private access specifier on the class methods
-
using the private access specifier on the class fields
Pregunta 32
Pregunta
You should not define a class field that is dependent upon the values of other class fields:
Respuesta
-
in order to avoid having stale data
-
in order to keep it current
Pregunta 33
Pregunta
Instance methods do not have this key word in their headers:
Respuesta
-
public
-
protected
-
static
Pregunta 34
Pregunta
It is common practice to use a ________ variable as a size declarator
Respuesta
-
reference
-
final
Pregunta 35
Pregunta
What will be the value of x[8] after the following code has been executed?
final int SUB = 12;
int[] x = new int[SUB];
int y = 100;
for(int i = 0; i < SUB; i++)
{
x[i] = y;
y += 10;
}
Respuesta
-
200
-
170
-
180
Pregunta 36
Pregunta
Java performs ________, which means that it does not allow a statement to use a subscript that is outside the range of valid subscripts for the array.
Respuesta
-
array bounds checking
-
scope resolution binding
Pregunta 37
Pregunta
What will be the results of the following code?
final int ARRAY_SIZE = 5;
double[] x = new double[ARRAY_SIZE];
for(int i = 1; i <= ARRAY_SIZE; i++)
{
x[i] = 10.0;
}
Respuesta
-
compilation error will occur
-
An error will occur when the program runs
Pregunta 38
Pregunta
What would be the results of the following code?
int[] x = { 55, 33, 88, 22, 99,
11, 44, 66, 77 };
int a = 10;
if(x[2] > x[5])
a = 5;
else
a = 8;
Respuesta
-
a=5
-
a=8
Pregunta 39
Pregunta
What would be the results of the following code?
int[] array1 = new int[25];
… // Code that will put values in array1
int value = array1[0];
for (int a = 1; a < array1.length; a++)
{
if (array1[a] < value)
value = array1[a];
}
Respuesta
-
Value contains the highest value in array1.
-
Value contains the lowest value in array1
Pregunta 40
Pregunta
What do you normally use with a partially-filled array?
Respuesta
-
An accompanying integer value that holds the number of items stored in the array
-
An accumulator
Pregunta 41
Pregunta
To return an array of long values from a method, use this as the return type for the method.
Respuesta
-
long[ARRAY_SIZE]
-
long[]
Pregunta 42
Pregunta
In order to do a binary search on an array:
Respuesta
-
the array must first be sorted in ascending order
-
there are no requirements
Pregunta 43
Pregunta
What is the value of scores[2][3] in the following array?
int [] [] scores = { {88, 80, 79, 92}, {75, 84, 93, 80},
{98, 95, 92, 94}, {91, 84, 88, 96} };
Respuesta
-
93
-
94
Pregunta 44
Pregunta
The part of a method that is a collection of statements that are performed when the method is executed is called
Respuesta
-
argument
-
method body
Pregunta 45
Pregunta
An array has a/an __________ size
Respuesta
-
fixed
-
dynamic
-
both answers are acceptable
Pregunta 46
Pregunta
An ArrayList has a fixed or dynamic size
Respuesta
-
False
-
True (either or statement is true)
Pregunta 47
Pregunta
When trying to access an element of an array, Java performs array _____ checking to make sure the subscript of the element exists
Respuesta
-
method
-
bound
Pregunta 48
Pregunta
Given an array variable with the name kiwi, what is the code to get the amount of elements in kiwi?
Respuesta
-
kiwi.length
-
kiwi.length;
Pregunta 49
Pregunta
Given an ArrayList variable with the name kiwi, what is the code to get the amount of elements in kiwi?
Respuesta
-
kiwi.size;
-
kiwi.size()
Pregunta 50
Pregunta
Given a String variable with the name kiwi, what is the code to get the amount of characters in kiwi?
Respuesta
-
kiwi.length();
-
kiwi.size();
Pregunta 51
Pregunta
Classes have _______ which store data
Respuesta
-
objects
-
fields
Pregunta 52
Pregunta
What is the term used for the character that separates tokens?
Respuesta
-
tokenizer
-
delimiter
Pregunta 53
Pregunta
What will be the value of x after the following code is executed?
int x, y = 2, z = 3;
x = (++y)*(++z);
Respuesta
-
error, x is undefined
-
12 (since ++y becomes 3 and ++z becomes 4)
Pregunta 54
Pregunta
How many times will the following do-while loop be executed?
int x = 5;
do
{ x*=2;} while (x > 10)
Respuesta
-
10
-
1
Pregunta 55
Pregunta
What will be the value of x after the following code is executed? If the code has any kind of syntax error, please type in the answer "error".
int x = 1;
while (x++ < 10) {
x++;
}
Respuesta
-
9
-
12
Pregunta 56
Pregunta
How many times will the following for loop be executed?
for (int count = 1; count <= 7; count += 3) {System.out.println("Java is great!!!");}
Respuesta
-
two
-
three
Pregunta 57
Pregunta
What will the following code output to the console?
int [ ] integers = new int [5];
System.out.println(integers[0]);
Respuesta
-
zero since this is the default value for int
-
one
Pregunta 58
Pregunta
What will the following code output to the console?
ArrayList<Integer> integers = new ArrayList<>(5);
System.out.println(integers.get(0));
Respuesta
-
0
-
error since new array list is not defined
Pregunta 59
Pregunta
What is the output?
ArrayList<Integer> integers = new ArrayList<>();
integers.add(5);
integers.add(7);
integers.add(1,18);
integers.remove(0);
System.out.println(integers.get(0));
Respuesta
-
1
-
18
Pregunta 60
Pregunta
What's the output?
ArrayList<String> strings = new ArrayList<>();
strings.add("hi");
strings.add("bye");
strings.add("howdy");
strings.remove(0);
System.out.println(strings.get(2));
Respuesta
-
howdy
-
error
Pregunta 61
Pregunta
What is the output?
int[ ] integers = {1,2,3,4,5};
for (int i = 0; i< integers.length; i++) {
integers [i]++;
}
System.out.println(integers[3]);
Respuesta
-
five
-
four
Pregunta 62
Pregunta
What is the output?
int[]integers = new int[10];
final int AMOUNT_OF_RUNS = 20;
final int ADD_ME = 5;
for (int i = 0; i < AMOUNT_OF_RUNS; i++) {
integers[i] += ADD_ME;
}
System.out.println(integers[3]);
Respuesta
-
error because it is asking to run an amount of 20 times when an array is only 10 long
-
10
Pregunta 63
Pregunta
What is the output?
int [ ] integers = new int [10];
final int ADD_ME = 5;
for (int i = 0; i< integers.length; i++) {
integers [i] += ADD_ME*1;
}
System.out.println(integers[4]);
Respuesta
-
error
-
20
Pregunta 64
Pregunta
What is the output?
int [ ] [ ] integers = { { 14, 5, 21}, {34, 54}, {3, 6, 7}};
int total = 0;
for (int row = 0; row<integers.length; row++) {
for (int col = 0; col<integers[0].length; col++) {
total += integers[row][col];
}
}
System.out.println(total);
Respuesta
-
Error since this is a ragged array
-
54
Pregunta 65
Pregunta
What is the output?
int [ ] [ ] integers = { { 14, 5, 21}, {34, 54}, {3, 6, 7}};
int mysteryVariable = 0;
for (int row = 0; row<integers.length; row++) {
for (int col = 0; col<integers[row].length; col++) {
mysteryVariable++;
}
}
System.out.println(mysteryVariable);
Respuesta
-
error
-
8
Pregunta 66
Pregunta
what is the output?
int [] [] integers = {{14,5,21{, {34, 54}, {3,6,7}};
int mysteryVariableOne = integers [0][0];
int mysteryVariableTwo = integers [0][0];
for (int row = 0; row < integers.length; row++) {
for (int col = 0; col <integes[row].length; col++) {
if (mysteryVariableOne < integers[row][col]) {
mysteryVariableOne = integers[row][col];
}
if (mysteryVariableTwo> integers[row][col]) {
mysterVariableTwo = integers[row][col];
}}}
System.out.println(myseryVariableOne - mysteryVariableTwo);
Respuesta
-
51 (since 54 is the highest, and 3 is the lowest then 54 - 3 = 51)
-
error
Pregunta 67
Pregunta
Output?
static ArrayList<String> listOfStrings;
public static void main (String[ ] args) {
String [ ] strings = {"D", "Z", "G", "P", "M" };
for (String s : strings)
listOfStrings.add(s);
System.out.println(listOfStrings.get(2));
}
Respuesta
-
error
-
G
Pregunta 68
Pregunta
Output?
static ArrayList<String> listOfStrings;
public static void main (String[ ] args) {
String [ ] strings = {"D", "Z", "G", "P", "M" };
ArrayList<String> listOfStrings = new ArrayList<>();
for (int i = strings.length-1; i>0; i--) {
listOfStrings.add(strings[i] + strings[i-1]);
System.out.println(listOfStrings.get(2));
Respuesta
-
Error
-
GZ
-
ZD
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