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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) 0 1 2
B) 1 2 3 4
C) Compilation fails.
D) 1 2 3
E) An exception is thrown.
F) 0 1 2 3

2. 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 2 and line 3
B) Line 1 only
C) Line 1 and line 2
D) The program successfully compiles
E) Line 1 and line 3
F) Line 3 only
G) Line 2 only

3. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) -UnitedSTATES
B) -UNITEDSTATES
C) United-States
D) United-STATES
E) -UnitedStates
F) UNITED-STATES
G) UnitedStates

4. Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?

A) long
B) Compilation fails.
C) integer
D) It throws an exception at runtime.
E) nothing
F) string

5. Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?

A) Compilation fails.
B) An exception is thrown at runtime.
C) vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
D) Nothing

Solutions: