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Updated: Jun 01, 2026
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Oracle Java SE 21 Developer Professional Sample Questions:
1. Which two of the following aren't the correct ways to create a Stream?
A) Stream stream = Stream.ofNullable("a");
B) Stream stream = Stream.of("a");
C) Stream stream = Stream.empty();
D) Stream stream = Stream.of();
E) Stream<String> stream = Stream.builder().add("a").build();
F) Stream stream = Stream.generate(() -> "a");
G) Stream stream = new Stream();
2. 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,h i]
C) [,hello,hi]
D) [,hello,h i]
3. Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?
A) Only if assertions are enabled and the input argument isn't null
B) Only if assertions are enabled and the input argument is null
C) Only if assertions are disabled and the input argument is null
D) Only if assertions are disabled and the input argument isn't null
E) A NullPointerException is never thrown
4. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?
A) IOException
B) RuntimeException
C) Compilation fails
D) ArithmeticException
5. Which three of the following are correct about the Java module system?
A) Code in an explicitly named module can access types in the unnamed module.
B) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
C) The unnamed module exports all of its packages.
D) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
E) The unnamed module can only access packages defined in the unnamed module.
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:
| Question # 1 Answer: E,G | Question # 2 Answer: D | Question # 3 Answer: C | Question # 4 Answer: D | Question # 5 Answer: B,C,F |
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