Oracle 1z0-830 Exam : Java SE 21 Developer Professional

Oracle 1z0-830 exam
  • Exam Code: 1z0-830
  • Exam Name: Java SE 21 Developer Professional
  • Updated: Jul 07, 2026
  • Q & A: 85 Questions and Answers
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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?

A) MMMM dd
B) MMM dd
C) MM d
D) MM dd


2. Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?

A) Sum: 22.0, Max: 8.5, Avg: 5.0
B) Compilation fails.
C) An exception is thrown at runtime.
D) Sum: 22.0, Max: 8.5, Avg: 5.5


3. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A) IOException
B) Compilation fails
C) ArithmeticException
D) RuntimeException


4. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) It throws an exception
B) Compilation fails
C) PT6H
D) PT0D
E) PT0H


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


Solutions:

Question # 1
Answer: A
Question # 2
Answer: D
Question # 3
Answer: C
Question # 4
Answer: C
Question # 5
Answer: B

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