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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements are correct?

A) You can use 'final' modifier with all kinds of classes
B) You can use 'public' access modifier with all kinds of classes
C) You can use 'protected' access modifier with all kinds of classes
D) You can use 'private' access modifier with all kinds of classes
E) None

2. Which of the following isn't a valid option of the jdeps command?

A) --list-reduced-deps
B) --generate-module-info
C) --check-deps
D) --list-deps
E) --generate-open-module
F) --print-module-deps

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

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

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

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

Solutions: