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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?

A) A ClassCastException is thrown.
B) Compilation fails.
C) false
D) true
E) A NullPointerException is thrown.

3. Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A) It compiles.
B) It throws an exception at runtime.
C) It does not compile.

4. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.of("a");
B) Stream stream = Stream.empty();
C) Stream<String> stream = Stream.builder().add("a").build();
D) Stream stream = Stream.ofNullable("a");
E) Stream stream = new Stream();
F) Stream stream = Stream.generate(() -> "a");
G) Stream stream = Stream.of();

5. 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) array3
B) array2
C) array4
D) array5
E) array1

Solutions: