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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) abc
B) ABC
C) Compilation fails.
D) An exception is thrown.

3. Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A) It does not compile.
B) It compiles.
C) It throws an exception at runtime.

4. Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

A) 1 5 5 1
B) 1 1 2 2
C) 1 1 1 1
D) 1 1 2 3
E) 5 5 2 3

5. Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?

A) Compilation fails.
B) Sum: 22.0, Max: 8.5, Avg: 5.5
C) An exception is thrown at runtime.
D) Sum: 22.0, Max: 8.5, Avg: 5.0

Solutions: