PDF Version DemoOracle Java SE 21 Developer Professional Sample Questions:
1. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?
A) An exception is always thrown
B) Both files f1.txt and f2.txt exist
C) File f1.txt exists while file f2.txt doesn't
D) Neither files f1.txt nor f2.txt exist
E) File f2.txt exists while file f1.txt doesn't
2. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?
A) It's a double with value: 42
B) It throws an exception at runtime.
C) It's a string with value: 42
D) It's an integer with value: 42
E) null
F) Compilation fails.
3. Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?
A) Sum: 22.0, Max: 8.5, Avg: 5.0
B) Sum: 22.0, Max: 8.5, Avg: 5.5
C) An exception is thrown at runtime.
D) Compilation fails.
4. Which of the following doesnotexist?
A) DoubleSupplier
B) BiSupplier<T, U, R>
C) LongSupplier
D) They all exist.
E) BooleanSupplier
F) Supplier<T>
5. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?
A) Line 3 only
B) Line 1 only
C) Line 1 and line 3
D) The program successfully compiles
E) Line 2 and line 3
F) Line 2 only
G) Line 1 and line 2
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: F | Question # 3 Answer: B | Question # 4 Answer: B | Question # 5 Answer: D |
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