Download Oracle : 1z0-830 Questions & Answers as PDF & Test Software
Updated: Jun 03, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle Java SE 21 Developer Professional Sample Questions:
1. Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?
A) Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
B) var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors);
C) Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors);
D) Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
E) Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
2. Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)
A) array4
B) array2
C) array3
D) array5
E) array1
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: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
B) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
C) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
D) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
4. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)
A) var e;
B) var h = (g = 7);
C) var f = { 6 };
D) var b = 2, c = 3.0;
E) var a = 1;(Valid: var correctly infers int)
F) var d[] = new int[4];
5. Which two of the following aren't the correct ways to create a Stream?
A) Stream stream = new Stream();
B) Stream<String> stream = Stream.builder().add("a").build();
C) Stream stream = Stream.of("a");
D) Stream stream = Stream.empty();
E) Stream stream = Stream.ofNullable("a");
F) Stream stream = Stream.of();
G) Stream stream = Stream.generate(() -> "a");
Solutions:
| Question # 1 Answer: A,B,E | Question # 2 Answer: D,E | Question # 3 Answer: A | Question # 4 Answer: A,C,D,F | Question # 5 Answer: A,B |
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