Which of the following are valid Java identifiers?
| Identifier | Valid? |
|---|---|
A | __Q1A |
88 | __Q1B |
abc | __Q1C |
_abc | __Q1D |
$$ | __Q1E |
ab c | __Q1F |
1Z | __Q1G |
lookupinthesky | __Q1H |
thing_one | __Q1I |
thing-one | __Q1J |
Select the correct type of the literal in the left column.
| Literal | Type |
|---|---|
0L | __Q2A |
100000 | __Q2B |
"0L" | __Q2C |
'A' | __Q2D |
"" | __Q2E |
3.14D | __Q2F |
3.14 | __Q2G |
3.14f | __Q2H |
true | __Q2I |
-1 | __Q2J |
Drag the types from the left to the right and arrange them in promotion order, where types higher in the list are promoted to types lower in the list.
byte
short
int
long
float
double
String
Evaluate the expressions in the first column. Choose the value to which each evaluates from the second column.
| Expression | Value |
|---|---|
5 > 5 | __Q4A |
5 >= 5 | __Q4B |
0 < -1 | __Q4C |
2 + 3 * 4 == 20 | __Q4D |
true == !false | __Q4E |
(7 < 9) || (7 > 9) | __Q4F |
(7 < 9) && (7 > 9) | __Q4G |
(0 > 1) || (1 > 2) | __Q4H |
(true || false) || (false && true) | __Q4I |
!!true | __Q4J |
Consider each expression on the left. Choose from the dropdowns on the right the the value and type that results from evaluating each expression.
| Expression | Value | Type |
|---|---|---|
1 + 1.0 |
__Q5AV | __Q5AT |
2 + 2 * 1.0 |
__Q5BV | __Q5BT |
2 * 2 + 1 |
__Q5CV | __Q5CT |
3 / 2 + 1 |
__Q5DV | __Q5DT |
3 + 2 / 1 |
__Q5EV | __Q5ET |
30 / 12 |
__Q5FV | __Q5FT |
30 % 12 |
__Q5GV | __Q5GT |