Chapter 2: Operators and Statements Flashcards
Order of operations:
+
expression++
–expression
expression ++ (post-unary)
–expression (pre-unary)
+ (other unary)
Order of operations: \+ % / << instanceof
/ %
+
«_space;(shift)
instanceof (relational)
Order of operations: && | > = == ^ ? :
> (relational) == (equal/not equal) | ^ (logical) && (short circuit logical) ? : (ternary) = (assignment)
What happens when you add two numeric values of different data types?
The value with the smaller type will be promoted to the larger type
What happens when you add a floating point number with an integral number?
The integral number will be promoted to the type of the floating point number
What happens when you add a short and a byte together?
They are both promoted to int and the result is an int
What happens when you add two shorts together?
They are both promoted to int and the result is an int
What is the return value of ++8?
9
What is the return value of 7–?
7
T or F: += automatically casts the result of the right side to the type of the left side?
True
What is the return value of the assignment operator
The return value is the same as the value being assigned to the left side
What data types work with , <=, >=?
Numeric values
What is the difference between & and &&
&& 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
What are valid operands for ==?
Two numeric values
Two booleans
Two objects (including null and String)
T or F: The results of the ternary operator must have the same data types
False. Unless the result is being assigned to a variable, in which case both need to be valid assignments
T or F: A switch case must have one case
False
What data types can be used for the switch cases?
anything that promotes to int char enum String numeric wrapper classes
Is it mandatory to have a default case in a switch statement?
No
T or F: A switch statement’s default case must be the last case
False. It can go anywhere in the switch
Can the code from another case be executed after the default case?
Yes as long as the default case is not the last case and it has no break statement
T or F: In a for loop, the update statment runs immediately after the evaluation statment
False. The update statement runs after the body executes
Is it possible to declare multiple variables in a for loop?
Yes
T or F: You can only update one variable in a for loop’s update statement
False
What is required for a collection to be used in a for each loop?
The collection must implement Iterable
The data type of the variable must match the type stored in the colleciton
