Oracle Java SE 21 Developer Professional : 1z0-830

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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 10
B) 14
C) 12
D) 11

2. Which of the followingisn'ta correct way to write a string to a file?

A) java
try (BufferedWriter writer = new BufferedWriter("file.txt")) {
writer.write("Hello");
}
B) java
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes);
C) java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
}
D) java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
E) None of the suggestions
F) java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
}

3. Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

A) 1 1 1 1
B) 1 1 2 3
C) 1 5 5 1
D) 5 5 2 3
E) 1 1 2 2

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

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

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

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

Solutions: