Unit 1

Question 1

Naming convention of a class

Answer 1

Upper camel case “ BonJour”

Question 2

Writing convention of an interface

Answer 2

uppercase start and should be an adjective “Adjective”

Question 3

Writing convention of a method

Answer 3

lower camel case “bonJour”

Question 4

Writing convention of a variable

Answer 4

lower camel case “bonJour”

Question 5

Writing convention of a camel case

Answer 5

all lowcase “mypack”

Question 6

Writing convention of constants

Answer 6

ALL CAPS “BONJOUR”

Question 7

What is main

Answer 7

a method

Question 8

What is public

Answer 8

Access specifier (control the visibility)

Question 9

What is static

Answer 9

To call main w/o instantiating

Question 10

void?

Answer 10

Return type

Question 11

args

Answer 11

name chosen for this String array

Question 12

What is the range of a byte

Answer 12

-128 ~ 127

Question 13

What happens when you pass the limit of a datatype

Answer 13

For into it either creates an over flow or an underflow where it goes to the maximum or or minimum number

Question 14

int i=5;
int j=i++;
int g=5;
int k=++g;

Answer 14

j=i then i+1
g=g+1 then new g=k

Question 15

True or False: Java gives a warning whenever a variable isn’t used.

Answer 15

True, not an error warning.

Question 16

What is the difference between char in Java vs char in C/C++?

Answer 16

In C/C++, char is an integer type (8 bit wide). But Java uses Unicode (UTF-16) to represent them. In Java,
char is of 16 bit type.

Question 17

Vrai ou faux? You can convert double to int in java and the reverse.

Answer 17

Faux. It is an error, unlike C++ it won’t round up or down. but the reverse is true. Same thing with boolean…its not allowed.

Question 18

public class Main {
public static void main(String args[])
{
int x=2;
int y=x++*3;
System.out.println(x+” “ +y);//15.0

       }}   What's the output?

Answer 18

3 and 6

Question 19

What does ~ do ?

Answer 19

if 9,then -10

Question 20

double result= ++y*x/y;

Answer 20

the second y is the new y

Question 21

System.out.println(a+b+” “+a+b);
System.out.println(a+b+a+b);

Answer 21

19 712
38 so unless there is a string it adds

Question 22

Continue skips to the iteration and breaks skips the whole iterations

Answer 22

Try it!