1z1-830 試験問題を無料オンラインアクセス

Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

• A.Only if assertions are enabled and the input argument isn't null
• B.A NullPointerException is never thrown
• C.Only if assertions are disabled and the input argument is null
• D.Only if assertions are disabled and the input argument isn't null
• E.Only if assertions are enabled and the input argument is null

Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?

• A.PT8784H
  P1Y
• B.P1Y
  PT8784H
• C.UnsupportedTemporalTypeException
• D.P1Y
  UnsupportedTemporalTypeException

Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

• A.11
• B.14
• C.12
• D.10

Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

• A.fos.write("Today");
• B.fos.writeObject("Today");
• C.oos.write("Today");
• D.oos.writeObject("Today");

Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?

• A.var authorsMap3 = new HashMap<>();
  java
  authorsMap3.put("FR", frenchAuthors);
• B.Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
• C.Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
  java
  authorsMap1.put("FR", frenchAuthors);
• D.Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
• E.Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);