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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) ABC
B) Compilation fails.
C) abc
D) An exception is thrown.

2. Which of the following isn't a valid option of the jdeps command?

A) --generate-module-info
B) --list-deps
C) --list-reduced-deps
D) --print-module-deps
E) --check-deps
F) --generate-open-module

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

4. 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) United-STATES
C) -UnitedSTATES
D) -UNITEDSTATES
E) United-States
F) UNITED-STATES
G) -UnitedStates

5. Which three of the following are correct about the Java module system?

A) The unnamed module exports all of its packages.
B) The unnamed module can only access packages defined in the unnamed module.
C) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
D) Code in an explicitly named module can access types in the unnamed module.
E) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
F) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.

Solutions: