Oracle 1z0-830 : Java SE 21 Developer Professional

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following can be the body of a lambda expression?

A) An expression and a statement
B) Two statements
C) Two expressions
D) None of the above
E) A statement block

2. Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?

A) False
B) True

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: 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: 15, 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. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) abc
B) cbca
C) acb
D) cba
E) bca
F) cacb
G) bac

5. Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?

A) 42000E
B) 42000
C) 42 k
D) 42 000,00 €

Solutions: