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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) [d, b]
B) An UnsupportedOperationException is thrown
C) [c, b]
D) [d]
E) An IndexOutOfBoundsException is thrown
F) [a, b]

2. Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?

A) string
B) It throws an exception at runtime.
C) integer
D) nothing
E) long
F) Compilation fails.

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

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

5. Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

A) MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
B) MyService service = ServiceLoader.getService(MyService.class);
C) MyService service = ServiceLoader.load(MyService.class).findFirst().get();
D) MyService service = ServiceLoader.load(MyService.class).iterator().next();

Solutions: