Linkedin Java Assessment Answers
The LinkedIn Skill Assessments feature allows you to demonstrate your knowledge of the skills you’ve added to your profile. Job posters on LinkedIn can also add Skill Assessments as part of the job application process. This allows job posters to more efficiently and accurately verify the crucial skills a candidate should have for a role.
The topics in the Java assessment include:
- Java Fundamentals
- Java Classes and Instances
- Core APIs
- Java Data Structures
- Java System Fundamentals
- Java Object-Oriented Programming
- Java Access Modifiers
- Java Runtime
- Exceptions
- Java Functional Programming
Question Format
Multiple Choice
Language
English, French
ust
Linkedin Java Assessment Questions and Answers Latest
Q1. 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
Q2. 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
Q3. Given the string "strawberries" saved in a variable called fruit, what would fruit .substring(2, 5) return?
- raw - Correct Answer
- rub
- traw
- WEB
Q4. 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
- Hello World!
- It will throw a runtime exception.
Q5. 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
- the infinite number of times
- 5 times
- 10 times - Correct Answer
Q6. 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.
Q7. 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) ->
- names.sort(List.DECENDING) - Correct Answer
- Collections.sort(names)
Q8. 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
Q9. What method can be used to create a new instance of an object?
- another instance
- field
- private method
- constructor - Correct Answer
Q10. How can you achieve runtime polymorphism in Java?
- method calling
- method overrunning
- method overriding
- method overloading - Correct Answer
Q11. 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
Q12. 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)
Q13. 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
Q14. 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);
}
}
- false true
- The code does not compile.
- true - Correct Answer
- true false
Q15. 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
Linkedin Java Assessment Questions and Answers Old
Q1. Given the string "strawberries" saved in a variable called fruit, what would "fruit. substring(2, 5)" return?
- raw
- raw <<<<---Correct
- AWB
- traw
Reasoning: The substring method is accepting two arguments. The first argument being the index to start(includes that char at 2) and the second is the index of the string to end the substring(excludes the char at 5). Strings in Java are like arrays of chars. Therefore the method will return "raw" as those are the chars in index 2,3 and 4. You can also take the ending index and subtract the beginning index from it, to determine how many chars will be included in the substring (5-2=3).
Q2. How can you achieve runtime polymorphism in Java?
- method overloading
- method overrunning
- method overriding <<<<--- Correct
- method calling
Q3. Given the following definitions, which of these expressions will NOT evaluate to be true?
boolean b1 = true, b2 = false; int i1 = 1, i2 = 2;
- (i1 | i2) == 3
- i2 && b1 <<<<---Correct
- b1 || !b2
- (i1 ^ i2) < 4
Q4. What can you use to create new instances in Java?
- constructor <<<<---Correct
- another instance
- field
- private method
Q5. What is the output of this code?
1: class Main {
2: public static void main (String[] args) {
3: int array[] = {1, 2, 3, 4};
4: for (int i = 0; i < array.size(); i++) {
5: System.out.print(array[i]);
}
}
}
- It will not compile because of line 4. <<<<---Correct
- It will not compile because of line 3.
- 123
- 1234
Q6. 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();
Q7. 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
Q8. What is the result of this code?
1: class Main {
2: public static void main (String[] args){
3: System.out.println(print(1));
4: }
5: static Exception print(int i){
6: if (i>0) {
7: return new Exception();
8: } else {
9: throw new RuntimeException();
10: }
11: }
12: }
- 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.
Q9. Which class can compile given these declarations?
1: interface One {
2: default void method() {
3: System.out.println(""One"");
4: } }
5: interface Two {
6: default void method () {
7: System.out.println(""One"");
8: } }
- 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();
} }
Q10. What is the output of this code?
1: class Main {
2: public static void main (String[] args) {
3: List list = new ArrayList();
4: list.add("hello");
5: list.add(2);
6: System.out.print(list.get(0) instanceof Object);
7: System.out.print(list.get(1) instanceof Integer);
8: }
9: }
- The code does not compile.
- truefalse
- truetrue <<<<---Correct
- falsetrue
Q11. 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;
}
}
1: import mypackage.Math;
2: import mypackage.elementary.*;
3: class Main {
4: public static void main (String args[]){
5: System.out.println(Math.abs(123));
6: }
7: }
- Lines 1 and 2 generate compiler errors 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.
Q12. What is the result of this code?
1: class MainClass {
2: final String message(){
3: return "Hello!";
4: }
5: }
6: class Main extends MainClass {
7: public static void main(String[] args) {
8: System.out.println(message());
9: }
10: String message(){
11: return "World!";
12: }
13: }
- It will not compile because of line 10. <--- Correct
- "Hello!"
- It will not compile because of line 2.
- "World!"
Q13. 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
Q14. 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"
Reasoning: The int type in Java can be used to represent any whole number from -2147483648 to 2147483647. Therefore this code will not compile as the number assigned to 'a' is larger than the int type can hold.
Q15. 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);
Q16. How do you write a for each loop that will iterate over ArrayList<Pencil>pencilCase?
- for(Pencil pencil = pencilCase){}
- Iterator iterator = pencilCase.iterator();
- for(){iterator.hasNext()}{}
Q17. Fill in the blanks?
Object-oriented programming (OOP) is a programming language model that organizes software design around (objects), rather than (actions).
Q18. 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
Q19. Correct output of "apple".compareTo("banana")
- 0
- positive number
- negative number <<<<---Correct
- compilation error
Q20. 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())
Q21. 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
Q22. 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
Q23. 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)
Q24. 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
- an infinite number of times
Q25. The runtime system starts your program by calling which function first?
- iterative
- hello
- main <<<<---Correct
Q26. 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
Q27. 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
Q28. 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]
Q29. 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"
Q30. 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
- =======================================
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