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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) Compilation fails
B) RuntimeException
C) ArithmeticException
D) IOException

2. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
B) An exception is thrown at runtime.
C) {}
D) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
E) Compilation fails.

3. 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();
D) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
E) var concurrentHashMap = new ConcurrentHashMap(42);

4. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) US=UK
B) An exception is thrown.
C) -US=UK
D) US-UK
E) =US-UK
F) Compilation fails.

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

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

Solutions: