Get real 1z1-830 exam questions for better preparation
Real Oracle 1z1-830 practice exam questions for easy pass!
Updated: Jul 07, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle Java SE 21 Developer Professional Sample Questions:
1. 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) var concurrentHashMap = new ConcurrentHashMap();
B) None of the suggestions.
C) var concurrentHashMap = new ConcurrentHashMap(42, 10);
D) var concurrentHashMap = new ConcurrentHashMap(42);
E) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
2. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?
A) Line 2 only
B) Line 1 and line 3
C) The program successfully compiles
D) Line 3 only
E) Line 1 only
F) Line 2 and line 3
G) Line 1 and line 2
3. What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}
A) 666 666
B) 666 42
C) Compilation fails
D) 42 42
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 1 2 3
B) 1 1 1 1
C) 1 1 2 2
D) 5 5 2 3
E) 1 5 5 1
5. 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, c=2, a=3}
D) {a=1, b=2, c=3}
E) {c=1, b=2, a=3}
F) {b=1, a=3, c=2}
G) {a=3, b=1, c=2}
Solutions:
| Question # 1 Answer: E | Question # 2 Answer: C | Question # 3 Answer: D | Question # 4 Answer: A | Question # 5 Answer: G |
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