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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. 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 2
C) 1 1 2 3
D) 1 5 5 1
E) 5 5 2 3

2. Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A) java
String colors = """
red \s
green\s
blue \s
""";
B) None of the propositions
C) java
String colors = """
red \t
green\t
blue \t
""";
D) java
String colors = """
red
green
blue
""";
E) java
String colors = """
red \
green\
blue \
""";

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

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

4. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) static
B) default
C) nothing
D) Compilation fails

5. Which three of the following are correct about the Java module system?

A) Code in an explicitly named module can access types in the unnamed module.
B) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
C) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
D) The unnamed module exports all of its packages.
E) The unnamed module can only access packages defined in the unnamed module.
F) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.

Solutions: