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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following java.io.Console methods doesnotexist?

A) readLine(String fmt, Object... args)
B) reader()
C) readLine()
D) read()
E) readPassword()
F) readPassword(String fmt, Object... args)

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

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

3. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) An exception is thrown.
B) ABC
C) Compilation fails.
D) abc

4. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) An exception is thrown.
B) 0 1 2
C) 0 1 2 3
D) 1 2 3
E) 1 2 3 4
F) Compilation fails.

5. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) home
B) C:
C) Compilation error
D) C
E) IllegalArgumentException

Solutions: