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