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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

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

Question 2

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");
}

Question 3

Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A. An IndexOutOfBoundsException is thrown
B. [d]
C. [d, b]
D. An UnsupportedOperationException is thrown
E. [c, b]
F. [a, b]

Question 4

Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?

A. Compilation fails
B. An exception is thrown
C. ok the 2024-07-10T07:17:45.523939600
D. ok the 2024-07-10

Question 5

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

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

Solutions: