Categories: LinkedIn Java Assessment Answers

LinkedIn Java Assessment Answers

LinkedIn Java Skill Assessment Answers 2021

Q1. What is the output of this code?

class Main { public static void main (String[] args) { String message = “Hello world!”; String newMessage = message.substring(6, 12) + message.substring(12, 6); System.out.println(newMessage); }}

The code does not compile.
A runtime exception is thrown <<<<—Correct
“world!!world”
“world!world!”
String m = “Hello world!”;
String n = m.substring(6,12) + m.substring(12,6);
System.out.println(n);

Q2. How do you write a foreach loop that will iterate over ArrayList<Pencil>pencilCase?

for(Pencil pencil = pencilCase){}
Iterator iterator = pencilCase.iterator();
for(){iterator.hasNext()}{}

Q3. Fill in the blanks?

Object-oriented programming (OOP) is a programming language model that organizes software design around (objects), rather than (actions).

Q4. What code would you use to tell if “schwifty” is of type String?

“schwifty”.getType() == String
“schwifty”.getClass().getsimpleName() == “String”
“schwifty”.getType().equals(“String”)
“schwifty” instanceof String <<<<—Correct

Q5. Correct output of “apple”.compareTo(“banana”)

0
positive number
negative number <<<<—Correct
compilation error

Q6. You have an ArrayList of names that you want to sort alphabetically. Which approach would NOT work?

names.sort(Comparator.comparing(String::toString))
Collections.sort(names)
names.sort(List.DESCENDING) <<<— Correct (not too sure)
names.stream().sorted((s1, s2) -> s1.compareTo(s2)).collect(Collectors.toList())

Q7. By implementing encapsulation, you cannot directly access the class’s _____ properties unless you are writing code inside the class itself.

private <<<<—Correct
protected
no-modifier
public

Q8. Which is the most up-to-date way to instantiate the current date?

new SimpleDateFormat(“yyyy-MM-dd”).format(new Date())
new Date(System.currentTimeMillis())
LocalDate.now()
Calender.getInstance().getTime() <<<<— Correct

Q9. Fill in the blank to create a piece of code that will tell wether int0 is divisible by 5:

boolean isDivisibleBy5 = _____
int0 / 5 ? true: false
int0 % 5 == 0 <<<<—Correct
int0 % 5 != 5
Math.isDivisible(int0, 5)

Q10. How many time will this code print “Hello World!”?
Class Main {
public static void main(String[] args){
for (int i=0; i<10; i=i++){
i+=1;
System.out.println(“Hello World!”);
}
}
}

10 times
9 times
5 times <<<<—Correct
infinite number of times

Q11. The runtime system starts your program by calling which function first?

print
iterative
hello
main <<<<—Correct

Q12. What is the result of this code?
try{
System.out.print(“Hello World”);
}catch(Exception e){
System.out.println(“e”);
}catch(ArithmeticException e){
System.out.println(“e”);
}finally{
System.out.println(“!”);
}

It will throw a runtime exception
It will not compile <<<<—Correct
Hello World!
Hello World

Q13. Which statement is NOT true?

An anonymous class may specify an abstract base class as its base type.
An anonymous class does not require a zero-argument constructor. <<<<—Correct
An anonymous class may specify an interface as its base type.
An anonymous class may specify both an abstract class and interface as base types

Q14. What will this program print out to the console when executed?
public class Main {
public static void main(String[] args){
LinkedList<Integer> list = new LinkedList<>();
list.add(5);
list.add(1);
list.add(10);
System.out.println(list);
}
}

[5, 1, 10] <<<<—Correct
[10, 5, 1]
[1, 5, 10]
[10, 1, 5]

Q15. What is the output of this code?
class Main {
public static void main(String[] args){
String message = “Hello”;
for (int i = 0; i<message.length(); i++){
System.out.print(message.charAt(i+1));
}
}
}

“Hello”
A runtime exception is thrown. <<<<—Correct
The code does not compile.
“ello”

Q16. Object-oriented programming is a style of programming where you organize your program around ____ rather than ____ and data rather than logic.

functions; actions
objects; actions
actions; functions
actions; objects

Q17. Given the string “strawberries” saved in a variable called fruit, what would “fruit.substring(2, 5)” return?

rawb
raw <<<<—Correct
awb
traw

Q18. How can you achieve runtime polymorphism in Java?

method overloading
method overrunning
method overriding <<<<— Correct
method calling

Q19. Given the following definitions, which of these expressions will NOT evaluate to true?
boolean b1 = true, b2 = false;
int i1 = 1, i2 = 2;

(i1 | i2) == 3
i2 && b1 <<<<—Correct
b1 || !b2
(i1 ^ i2) < 4

Q20. What can you use to create new instances in Java?

constructor <<<<—Correct
another instance
field
private method

Q21. What is the output of this code?
class Main {
public static void main (String[] args) {
int array[] = {1, 2, 3, 4};
for (int i = 0; i < array.size(); i++) {
System.out.print(array[i]);
}
}
}

It will not compile because of line 4. <<<<—Correct
It will not compile because of line 3.
123
1234

Q22. Which of the following can replace the CODE SNIPPET to make the code below print “Hello World”?
interface Interface2 {
static void print() {
System.out.print(“World!”);
}
}

super1.print(); super2.print();
this.print();
super.print();
Interface1.print(); Interface2.print();

Q23. What does the following code print?String str = “”abcde””;str.trim();str.toUpperCase();str.substring(3, 4);System.out.println(str);

CD
CDE
D
“abcde” <<<<—Correct

Q24. What is the result of this code?
class Main {
public static void main (String[] args){
System.out.println(print(1));
}
static Exception print(int i){
if (i>0) {
return new Exception();
}
else {
throw new RuntimeException();
}
}
}

It will show a stack trace with a runtime exception.
“java.lang.Exception” <<<<—Correct
It will run and throw an exception.
It will not compile.

Q25. Which class can compile given these declarations?
interface One {
default void method() {
System.out.println(“”One””);
} }
interface Two {
default void method () {
System.out.println(“”One””);
}
}

class Three implements One, Two {

publc void method() { super.One.method(); } }

class Three implements One, Two {

publc void method() { One.method(); } }

class Three implements One, Two {

}

class Three implements One, Two { <—— correct

publc void method() { One.super.method(); } }

Q26. What is the output of this code?
class Main {
public static void main (String[] args) {
List list = new ArrayList();
list.add(“hello”);
list.add(2);
System.out.print(list.get(0) instanceof Object);
System.out.print(list.get(1) instanceof Integer);
}
}

The code does not compile.
truefalse
truetrue <<<<—Correct
falsetrue

Q27. Given the following two classes, what will be the output of the Main class?
package mypackage;
public class Math {
public static int abs(int num){
return num<0?-num:num;
}
}
package mypackage.elementary;
public class Math {
public static int abs (int num) {
return -num;
}
}
import mypackage.Math;
import mypackage.elementary.*;
class Main {
public static void main (String args[]){
System.out.println(Math.abs(123));
}
}

Lines 1 and 2 generate compiler erros due to class name conflicts.
“-123”
It will throw an exception on line 5.
“123” <— Correct // The answer is “123”. The abs() method evaluates to the one inside mypackage.Math class.

Q28. What is the result of this code?
class MainClass {
final String message(){
return “Hello!”;
}
}
class Main extends MainClass {
public static void main(String[] args) {
System.out.println(message());
}
String message(){
return “World!”;
}
}

It will not compile because of line 10. <— Correct
“Hello!”
It will not compile because of line 2.
“World!”

Q29. Given this code, which command will output “2”?
class Main {
public static void main(String[] args) {
System.out.println(args[2]);
}
}

java Main 1 2 “3 4” 5
java Main 1 “2” “2” 5 <— Correct
java Main.class 1 “2” 2 5
java Main 1 “2” “3 4” 5

Q30. What is the output of this code?
class Main { public static void main(String[] args){ int a = 123451234512345; System.out.println(a); }}

“123451234512345”
Nothing – this will not compile. <<<<—Correct
a negative integer value
“12345100000”

Q31. What is displayed when this code is compiled and executed?
Public class main {
public static void main(string[] args) {
int x= 5;x = 10;System.out.println(x);
}
}

5
null
x
10 – Correct answers

Q32. What statement returns true if “nifty” is of type String?

“nifty”.getType().equals(“string”)
“nifty”.getClass().getSimpleName() == “String”
“nifty” instantceof String – Correct Answer
“nifty” .getType() == String

Q33. Given the string “strawberries” saved in a variable called fruit, what would fruit .substring(2, 5) return?

raw – Correct Answer
rawb
traw
awb

Q34. What is the result of this code?
try{ System.out.print(“Hello World”);}catch(Exception e) { System.out.println(“e”);}catch(ArithmeticException e) { System.out.println(“e”);}finalyy{ System.out.println(“!”);}

It will not compile because the second catch statement is unreachable. – Correct Answer
Hello World
Hellow World!
It will thwow a runtime exception.

Q35. How many times will this code print “Hello World”?
class Main{ public static void main(String[] args) {
for (int i=0; i<10; i=i++){ i+=1; System.out.println(“Hello World!”); } }}

9 times
infinite number of times
5 times
10 times – Correct Answer

Q36. What is the result of this code?
class Main { Object message(){ return “Hello!”;
} public static void main(String[] args) { System.out.print(new main().MESSAGE()); System.out.print(new Main2().message()); }}class Main2 extends Main { String message(){ return “World!”; }}

It will compile because of line 7.
Hello!Hello!
Hello!World! – Correct Answers
It will not compile because of line 11.

Q37. You have an ArrayList of names that you want to sort alphabetically. Which approach would not work?

names.sort(Comparator.comparing(String::toString))
names = names.stream().sorted((s1, s2) ->

s1.compareTo(s2)).collect(Collectors.toList())

names.sort(List.DECENDING) – Correct Answer
Collections.sort(names)

Q38. What is the output of this code?
import java.util.*;class Main { public static void main(String[] args) { List<Boolean> list = new ArrayList<>(); list.add(true); list.add(Boolean.parseBoolean(“False”)); list.add(Boolean.TRUE); System.out.print(list.size()); System.out.print(list.get(1) instanceof Boolean); }}

3false
3true
2true
A runtime exception is thrown -Correct Answer

Q39. What method can be used to create a new instance of an object?

another instance
field
private method
constructor – Correct Answer

Q40. How can you achieve runtime polymorphism in Java?

method calling
method overrunning
method overriding
method overloading – Correct Answer

Q41. What is the output of this code?
class Main { public static void main(String[] args) { String message = “Hello wold!”; String newMessage = message.substring(6, 12) + message.substring(12, 6); System.out.println(newMessage); }}

The code does not compile
A runtime exception is thrown. – Correct Answer
world!world!
world!!world

Q42. Which is the most reliable expression for testing whether the values of two string variables are the same?

string1 == string2
string1.equals(string2) – Correct Answer
string1 = string2
string1.matches(string2)

Q43. What is the output of this code?
class Main {
static int cound = 0;
public static void main(String[] args) {
if(cound <3)
{count++;main(null);}
else{ return;
} System.out.println(“Hello World”);
}
}

it will throw a runtime exception.
it will print “Hello World!” three times.
it will not compile.
it will run forever. – Correct Answer

Q44. What is the output of this code?
class main {
public static void main(String[] args) {
List list = new ArrayList(); list.add(“hello”);
list.add(2);
System.out.print(list.get(0) instanceof Object); System.out.print(list.get(1) instanceof Integer);
}
}

falsetrue
The code does not compile.
truetrue – Correct Answer
truefalse

Q45. By implementing encapsulation, you cannot directly access the class’s_____properties unless you are writing code inside the class itself.

private – Correct Answer
protected
public
no-modifier

Java is an object-oriented programming language with a high level of abstraction and as few implementation dependencies as possible. It is a general-purpose programming language that allows application developers to write once and run anywhere (WORA), which means that compiled Java code can operate on any platform that supports Java without the need to recompile. Java applications are usually compiled to bytecode, which may execute on any Java virtual machine (JVM), regardless of the computer architecture.

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