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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A) [,hello,hi]
B) [ , hello ,hi ]
C) [ ,hello,h i]
D) [,hello,h i]

2. Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?

A) James
B) MissingResourceException
C) JeanneJames
D) Jeanne
E) Compilation fails
F) JamesJeanne

3. Which of the following methods of java.util.function.Predicate aredefault methods?

A) test(T t)
B) or(Predicate<? super T> other)
C) not(Predicate<? super T> target)
D) isEqual(Object targetRef)
E) negate()
F) and(Predicate<? super T> other)

4. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) bac
B) abc
C) cacb
D) bca
E) cba
F) cbca
G) acb

5. 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();
C) var concurrentHashMap = new ConcurrentHashMap(42, 10);
D) var concurrentHashMap = new ConcurrentHashMap(42);
E) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);

Solutions: