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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) {c=2, a=3, b=1}
B) Compilation fails
C) {b=1, a=3, c=2}
D) {a=3, b=1, c=2}
E) {c=1, b=2, a=3}
F) {b=1, c=2, a=3}
G) {a=1, b=2, c=3}

3. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) Compilation fails.
B) Chanel
C) An ArrayIndexOutOfBoundsException is thrown at runtime.
D) Chanel Dior Louis Vuitton

4. Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?

A) It prints all elements, but changes made during iteration may not be visible.
B) It throws an exception.
C) Compilation fails.
D) It prints all elements, including changes made during iteration.

5. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) 0 1 2 3
B) 1 2 3 4
C) 1 2 3
D) An exception is thrown.
E) Compilation fails.
F) 0 1 2

Solutions: