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Oracle Java SE 21 Developer Professional Sample Questions:

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

2. 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) -UnitedStates
D) United-States
E) UNITED-STATES
F) UnitedStates
G) United-STATES

3. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var h = (g = 7);
B) var d[] = new int[4];
C) var e;
D) var f = { 6 };
E) var b = 2, c = 3.0;
F) var a = 1;(Valid: var correctly infers int)

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

5. Which methods compile?

A) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
B) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
C) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
D) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}

Solutions: