最新的Oracle 1z0-830免費考試真題

問題1

Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A. It's always 1

B. It's either 0 or 1

C. It's either 1 or 2

D. Compilation fails

E. It's always 2

正確答案: D

說明：（僅 Fast2test 成員可見）

問題2

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. P1Y
PT8784H

B. PT8784H
P1Y

C. P1Y
UnsupportedTemporalTypeException

D. UnsupportedTemporalTypeException

正確答案: C

說明：（僅 Fast2test 成員可見）

問題3

Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A. 2

B. It throws an exception at runtime.

C. 1

D. 0

E. Compilation fails.

正確答案: E

說明：（僅 Fast2test 成員可見）

問題4

What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A. 42 42

B. 666 42

C. 666 666

D. Compilation fails

正確答案: A

說明：（僅 Fast2test 成員可見）

問題5

Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A. bim boom bam

B. bim bam followed by an exception

C. bim bam boom

D. bim boom

E. Compilation fails.

正確答案: C

說明：（僅 Fast2test 成員可見）

問題6

Which of the following doesnotexist?

A. They all exist.

B. LongSupplier

C. BooleanSupplier

D. Supplier<T>

E. DoubleSupplier

F. BiSupplier<T, U, R>

正確答案: F

說明：（僅 Fast2test 成員可見）

問題7

Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?

A. A ClassCastException is thrown.

B. false

C. true

D. A NullPointerException is thrown.

E. Compilation fails.

正確答案: C

說明：（僅 Fast2test 成員可見）

問題8

Which of the following statements are correct?

A. None

B. You can use 'final' modifier with all kinds of classes

C. You can use 'private' access modifier with all kinds of classes

D. You can use 'public' access modifier with all kinds of classes

E. You can use 'protected' access modifier with all kinds of classes

正確答案: A

說明：（僅 Fast2test 成員可見）

問題9

What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A. PT0H

B. PT6H

C. PT0D

D. It throws an exception

E. Compilation fails

正確答案: B

說明：（僅 Fast2test 成員可見）

最新的Oracle Java SE 21 Developer Professional - 1z0-830免費考試真題

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