ExamQuestions

How many of the `Duration`, `LocalDateTime`, and `LocalTime` classes have the concept of a _time zone_?
A. None
B. One
C. Two
D. Three

How many lines does this print?
System.out.println("""
    "ape"
    "baboon"
    "gorilla"
    """);
A. Three
B. Four
C. Five
D> The code does not compile.

Which of the following are not valid variable names? (Choose two.)
A. `_`
B. `_blue`
C. `2blue`
D. `blue$`
E. `Blue`

Which class has a `getSeconds()` method?
A. Only the `Duration` class
B. Only the `Period` class
C. Both the `Duration` and `Period` classes
D. Neither class

Most of the United States observes daylight saving time on March 13, 2022, by moving the clocks forward an hour at 2am.
What does the following code output?
```
var localDate = LocalDate.of(2022, 3, 13);
var localTime = LocalTime.of(1, 0);
var zone = ZoneId.of("America/New_York");
var z = ZonedDateTime.of(localDate, localTime, zone);

var offset = z.getOffset();
var duration = Duration.ofHours(3);
var later = z.plus(duration);

System.out.println(later.getHour() + " " + offset.equals(later.getOffset()));
```
A. `4 false`
B. `4 true`
C. `5 false`
D. `5 true`
E. `6 false`
F. `6 true`
G. None of the above

What is the value of `tip` after executing the following code snippet?
```
int meal = 5;
int tip = 2;
var total = meal + (meal>6 ? tip++ : tip--);
```
A. `1`
B. `2`
C. `3`
D. `7`
E. None of the above

What does the following output?
```
int year = 1874;
int month = Month.MARCH;
int day = 24;
LocalDate date = LocalDate.of(year, month, day);
System.out.println(date.isBefore(LocalDate.now()));
```
A. `false`
B. `true`
C. The code does not compile.
D. The code compiles but throws an exception at runtime.

What is the output of the following?
```
var b = "12";
var b += "3";
b.reverse();
System.out.println(b.toString());
```
A. `12`
B. `21`
C. `123`
D. `321`
E. The code does not compile.

What is the output of the following?
```
var line = new StringBuilder("-");
var anotherLine = line.append("-");
System.out.print(line == anotherLine);
System.out.print(" ");
System.out.print(line.length());
```
A. `false 1`
B. `false 2`
C. `true 1`
D. `true 2`
E. It does not compile.

Given that daylight saving time starts on March 13, 2022, at 2am, and clocks jump from 01:59 am to 03:00 am, which of the following can fill in the blank so the code doesn't throw an exception?
```
var localDate = LocalDate.of(2022, 3, 13);
var localTime = LocalTime.of(____);
var zone = ZoneId.of("America/New_York");
var z = ZonedDateTime.of(localDate, localTime, zone);
```
A. `2, 0`
B. `3, 0`
C. Either of the above will run without throwing an exception.
D. Both of these will cause an exception to be thrown.

Which statement is true of this text block?
```
var block = """

  green
    yellow
""";
```
A. There is only essential whitespace.
B. There is only incidental whitespace.
C. There is both essential and incidental whitespace.
D. The code does not compile.

What are the return types of `cat`, `moose`, and `penguin`, respectivel?
```
var cat = Math.ceil(65);
var moose = Math.max(7, 8);
vafr penguin = Math.pow(2, 3);
```
A. `double`, `double`, `double`
B. `double`, `int`, `double`
C. `double`, `int`, `int`
D. `int`, `double`, `double`
E. `int`, `int`, `double`
F. `int`, `int`, `int`

What is the result of the following?
```
var waffleDay = LocalDate.of(2022, Month.MARCH, 25);
var period = Period.of(1, 6, 3);
var later = waffleDay.plus(period);
later.plusDays(1);
var thisOne = LocalDate.of(2023, Month.SEPTEMBER, 28);
var thatOne = LocalDate.of(2023, Month.SEPTEMBER, 29);
System.out.println(later.isBefore(thisOne) + " " + later.isBefore(thatOne));
```
A. `false false`
B. `false true`
C. `true true`
D. `true false`
E. The code does not compile.

Which operators work with one or more `boolean` types? (Choose three.)
A. `^`
B. `~`
C. `&`
D. `+`
E. `||`
F. `@`

What is a possible output of the following?
```
var montyPythonDate = LocalDate.of(2023, Month.MAY, 10);
var aprilFools = LocalDate.of(2023, Month.APRIL, 1);
var duration = Duration.ofDays(1);
var result = montyPythonDay.minus(duration);
System.out.println(result + " " + aprilFools.isBefore(result));
```
A. `2023-05-09 false`
B. `2023-05-09 true`
C. The code does not compile.
D. None of the above

What is the output of the following?
```
var line = new String("-");
var anotherLine = line.concat("-");
System.out.print(line == anotherLine);
Ststem.out.print(" ");
System.out.print(line.length());
```
A. `false 1`
B. `false 2`
C. `true 1`
D. `true 2`
E. The code does not compile.

How may of these lines contain a compiler error?
```
public void pi() {
    byte b = 3.14;
    double d = 3.14;
    float f = 3.14;
    short s = 3.14;
}
```
A. None
B. One
C. Two
D. Three
E. Four

In the United States, daylight saving time ends on November 6, 2022 at 02:00 am and we repeat the previous hour. What is the output of the following?
```
var localDate = LocalDate.of(2022, Month.NOVEMBER, 6);
var localTime = LocalTime.of(1, 0);
var zone = ZoneId.of("America/New_York");
var z = ZonedDateTime.of(localDate, localTime, zone);
var offset = z.getOffset();
for (int i = 0; i < 6; i++)
    z.plusHours(i);

System.out.print(z.getHour() + " " + offset,equals(z.getOffset()));
```
A. `5 false`
B. `5 true`
C. `6 false`
D. `6 true`
E. `7 false`
F. `7 true`
G. None of the above

What does the following code output?
```
var baa = 8;
var bleat = ~baa;
var sheep = ~bleat;
System.out.printf(bleaet + " " + sheep);
```
A. -8 8
B. -8 9
C. -9 8
D. -9 9
E. None of the above

The author of thismethod forgot to include the data type. Which of the following reference types can best fill in the blank to complete this method?
```
public static void secret(________ mystery) {
    char ch = mystery.charAt(3);
    mystery = mystery.insert(1, "more");
    int num = mystery.length();
}
```
A. `String`
B. `StringBuilder`
C. Both
D. Neither

`LocalTime.of()` has a number of overloads. Which of the following is not one of them?
A. `LocalTime.of(int hour, int minute)`
B. `LocalTime.of(int hour, int minute, int second)`
C. `LocalTime.of(int hour, int minute, int second, int nanoOfSecond)`
D. `LocalTime.of(int hour, int minute, int second, int nanoOfSecond, int picoSeconds)`

Which statements are true about the output of this code? (Choose three.)
```
var text = """
   ant  antelope \s \n
   cat "kitten" \
   seal sea lion
   """;
```
A. It contains two quotes.
B. It contains eight quotes.
C. It is three lines.
D. One line is blank.
E. Two lines are blank.
F. The first line contains trailing whitespace.
G. The first line does not contain trailing whitespace.

Fill in the blanks: The operators ~=, ___, ___, ___, and ++ are listed in the same or increasing levels of operator precedence. (Choose two.)
A. `==`, `*`, `!`
B. `/`, `%`, `!`
C. `*`, `--`, `*`
D. `!`, `*`, `%`
E. `+=`, `&&`, `*`
F. `*`, `<`, `/`

How many of the `LocalDate`, `Period`, and `ZonedDate` clases have a method to get the year?
A. None
B. One
C. Two
D. Three

What is the possible output of this code?
```
var time = LocalTime.of(1, 2, 3, 4);
System.out.println(time);
```
A. `01:02:03.4`
B. `01:02:03.000000004`
C. `01/01/1970 01:02:03.4`
D. `01/01/1970 01:02:03.000000004`

What is the output of the following?
```
var teams = new StringBuilder("333");
teams.append(" 806");
teams.append(" 1601");
System.out.print(teams);
A. `333`
B. `333 806 1601`
C. The code compiles but outputs something else.
D. The code does not compile.