Java Exam

Question 1

What does HTML Stand For?

Accepted Answer

Hyper Text Markup Language

Answer

Hyper Transfer Markup List

Answer

Home Tool Mac List

Answer

Hyperlinks and Text Markup Language

Question 2

Choose the appropriate data type for this value 5.5

Accepted Answer

double

Answer

int

Answer

boolean

Answer

String

Question 3

Choose the appropriate data type for this field: isSwimmer

Accepted Answer

boolean

Answer

double

Answer

string

Answer

int

Question 4

How do you print out Hello World? [blank_start]_____[blank_end]

Accepted Answer

System.out.println("Helloworld");

Question 5

What is garbage collection in the context of java?

Accepted Answer

When all references to an object are gone, then the memory used by the object is automatically reclaimed

Answer

The operating system periodically deletes all of the java files available on the system.

Answer

Any java package imported in a program and not being used, is automatically deleted.

Answer

The java virtual machine (JVM) checks the output of any java program and deleted anything that does not make sense at all.

Question 6

What are loops used for?

Accepted Answer

To run a piece of code repeatedly until a condition is met

Answer

To run a piece of code only when a certain condition is met

Answer

To run a piece of code repeatedly forever

Answer

To run a piece of code if the condition isn't met

Question 7

How do you write a for loop?

Accepted Answer

for (int i = 0; i < 21; i++) {}

Answer

for (int i = 0; i < 21) {}

Answer

for (int i = 0; i++) {}

Answer

for (= 0; i < 21; i++) {}

Question 8

Which is the right way to create an ArrayList of Integers?

Accepted Answer

ArrayList list = new ArrayList();

Answer

ArrayList list = new ArrayList;

Answer

ArrayList Integer = New ArrayList();

Answer

Integer ArrayList = new Integer ArrayList();

Question 9

How do you add 21 to an ArrayList of Integers?

Accepted Answer

list.add(21);

Answer

21.add(list);

Answer

list.put(21);

Answer

list.add("21");

Question 10

Which is the right way to put 21 at the second position in the ArrayList of Integers? 
(Remember zero-indexing)

Accepted Answer

list.add(1,21);

Answer

list.put(2,21);

Answer

list.add(2,21);

Answer

list.add(21,1);

Question 11

What is Object Oriented Programing (OOP)?

Accepted Answer

A programing model which is based upon the concept of objects. Objects contain data in the form attributes and the code form of methods.

Answer

A programing model which is derived from structured programing or a series of computational steps to be carried out .

Answer

A programming Paradigm in which we try to bind everything in pure mathematical functions style. It is a declarative type of programing style.

Answer

It is equivalent to a function, they are actions that perform operations on a variable. It accepts parameters as arguments, manipulates these and then produces an output when it is called on and object.

Question 12

What is the Syntax for creating a Scanner object named input? [blank_start]____[blank_end]

Accepted Answer

Scanner input = new Scanner (System.in);

Question 13

Declare and initialize a variable called num1 as a whole number datatype with the value of 25. [blank_start]____[blank_end]

Accepted Answer

int num1 = 25;

Question 14

How do you get the third element of an ArrayList?

Accepted Answer

list.get(2);

Answer

list.find(2);

Answer

list.find(3);

Answer

list.get(3);

Question 15

How do you write a for each loop that iterates through an ArrayList of Strings?

Accepted Answer

for (String s : list){}

Answer

for each (Strings s in list){}

Answer

for each (String s : list){}

Answer

for (Integer i : list){}

Question 16

What does a HashMap store?

Accepted Answer

Keys and Values

Answer

Values

Answer

Keys

Answer

Strings

Question 17

How do you create a HashMap with Strings as keys and Integers as Values?

Accepted Answer

HashMap map = new HashMap();

Answer

HashMap map = new HashMap();

Answer

HashMap mao = new HashMap();

Answer

HashMap map = new HashMap(String, Integer);

Question 18

How do you add an element to a HashMap with String keys and Integer values?

Accepted Answer

map.put("Stuff", 123);

Answer

map.put(Stuff,123);

Answer

map.add("Stuff" , 123);

Answer

map.add(Stuff ,123)

Question 19

How do you iterate through a HashMap using a for each loop?

Accepted Answer

for (String key : map.keySet()) {}

Answer

for each (String key : map.keySet()) {}

Answer

for (String key : map) {}

Answer

for each (String key : map) {}

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