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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A) [,hello,h i]
B) [,hello,hi]
C) [ ,hello,h i]
D) [ , hello ,hi ]

2. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A) File f2.txt exists while file f1.txt doesn't
B) Neither files f1.txt nor f2.txt exist
C) Both files f1.txt and f2.txt exist
D) File f1.txt exists while file f2.txt doesn't
E) An exception is always thrown

3. Which methods compile?

A) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
B) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
C) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
D) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}

4. Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?

A) It prints all elements, including changes made during iteration.
B) Compilation fails.
C) It throws an exception.
D) It prints all elements, but changes made during iteration may not be visible.

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

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

Solutions: