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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) An exception is thrown at runtime.
C) Compilation fails.
D) Nothing

2. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) An exception is thrown at runtime.
B) markdown
Inner class:
------------
Outer field
C) Compilation fails at line n2.
D) Compilation fails at line n1.
E) Nothing

3. Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}

A) stringBuilder3
B) stringBuilder2
C) stringBuilder1
D) stringBuilder4
E) None of them

4. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) None of the suggestions.
B) var concurrentHashMap = new ConcurrentHashMap(42, 10);
C) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
D) var concurrentHashMap = new ConcurrentHashMap();
E) var concurrentHashMap = new ConcurrentHashMap(42);

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

A) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
B) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
C) Code in an explicitly named module can access types in the unnamed module.
D) The unnamed module can only access packages defined in the unnamed module.
E) The unnamed module exports all of its packages.
F) 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.

Solutions: