Oracle Java SE 21 Developer Professional : 1z1-830

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?

A) An exception is thrown at runtime.
B) Compilation fails at line n2.
C) nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares.
D) Compilation fails at line n1.
E) Nothing

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

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

3. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
B) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
C) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
D) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6

4. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?

A) truetruefalse
B) truetruetrue
C) falsetruetrue
D) Compilation fails
E) truefalsetrue

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

Solutions: