Chapter 2: Operators and Statements

Question 1

Order of operations:
+
expression++
–expression

Answer 1

expression ++ (post-unary)
–expression (pre-unary)
+ (other unary)

Question 2

Order of operations:
\+
%
/
<<
instanceof

Answer 2

/ %
+
&laquo_space;(shift)
instanceof (relational)

Question 3

Order of operations:
&&
|
>
=
==
^
? :

Answer 3

> (relational)
== (equal/not equal)
| ^ (logical)
&& (short circuit logical)
? : (ternary)
= (assignment)

Question 4

What happens when you add two numeric values of different data types?

Answer 4

The value with the smaller type will be promoted to the larger type

Question 5

What happens when you add a floating point number with an integral number?

Answer 5

The integral number will be promoted to the type of the floating point number

Question 6

What happens when you add a short and a byte together?

Answer 6

They are both promoted to int and the result is an int

Question 7

What happens when you add two shorts together?

Answer 7

They are both promoted to int and the result is an int

Question 8

What is the return value of ++8?

Answer 8

9

Question 9

What is the return value of 7–?

Answer 9

7

Question 10

T or F: += automatically casts the result of the right side to the type of the left side?

Answer 10

True

Question 11

What is the return value of the assignment operator

Answer 11

The return value is the same as the value being assigned to the left side

Question 12

What data types work with , <=, >=?

Answer 12

Numeric values

Question 13

What is the difference between & and &&

Answer 13

&& is a short circuit operator. It will stop being evaluated once it finds one clause that determines the outcome of the rest of the statement

Question 14

What are valid operands for ==?

Answer 14

Two numeric values
Two booleans
Two objects (including null and String)

Question 15

T or F: The results of the ternary operator must have the same data types

Answer 15

False. Unless the result is being assigned to a variable, in which case both need to be valid assignments

Question 16

T or F: A switch case must have one case

Answer 16

False

Question 17

What data types can be used for the switch cases?

Answer 17

anything that promotes to int
char
enum
String
numeric wrapper classes

Question 18

Is it mandatory to have a default case in a switch statement?

Answer 18

No

Question 19

T or F: A switch statement’s default case must be the last case

Answer 19

False. It can go anywhere in the switch

Question 20

Can the code from another case be executed after the default case?

Answer 20

Yes as long as the default case is not the last case and it has no break statement

Question 21

T or F: In a for loop, the update statment runs immediately after the evaluation statment

Answer 21

False. The update statement runs after the body executes

Question 22

Is it possible to declare multiple variables in a for loop?

Answer 22

Yes

Question 23

T or F: You can only update one variable in a for loop’s update statement

Answer 23

False

Question 24

What is required for a collection to be used in a for each loop?

Answer 24

The collection must implement Iterable

The data type of the variable must match the type stored in the colleciton

Question 25

How can you break out of an outer loop from within an inner loop?

Answer 25

Use a label on the outer loop and use it when you call break

Question 26

What does continue do?

Answer 26

Stops the execution of the current loop

Transfers control to the boolean statement at the top of the loop