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