Oracle 1z1-830 Q&A - in .pdf

  • 1z1-830 pdf
  • Exam Code: 1z1-830
  • Exam Name: Java SE 21 Developer Professional
  • Updated: Sep 25, 2026
  • Q & A: 85 Questions and Answers
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  • Q & A: 85 Questions and Answers
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Oracle 1z1-830 Q&A - Testing Engine

  • 1z1-830 Testing Engine
  • Exam Code: 1z1-830
  • Exam Name: Java SE 21 Developer Professional
  • Updated: Sep 25, 2026
  • Q & A: 85 Questions and Answers
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1z1-830 Practice Dumps

Oracle 1z1-830 Exam Syllabus Topics:

SectionObjectives
Collections and Generics- Use List, Set, Map, Queue, and Deque implementations
- Use sequenced collections and maps
- Apply generics and bounded types
Object-Oriented Programming- Create and use classes, interfaces, enums, and records
- Implement encapsulation and abstraction
- Apply inheritance and polymorphism
Handling Date, Time, Text, Numeric and Boolean Values- Work with primitive wrappers and number formatting
- Use date, time, duration, period, and localization APIs
- Use String, StringBuilder, and related APIs
Java Concurrency- Use virtual threads
- Work with concurrent collections and executors
- Create and manage threads
Exception Handling- Create custom exceptions
- Handle checked and unchecked exceptions
- Use try-with-resources
Annotations and JDBC- Connect to databases using JDBC
- Use built-in and custom annotations
- Execute SQL operations and process results
Java I/O and NIO- Use Path, Files, and related APIs
- Read and write files
- Process file system resources
Modules and Packaging- Manage dependencies and exports
- Create and use Java modules
- Package and deploy applications
Functional Programming- Work with functional interfaces
- Process data using Stream API
- Use lambda expressions and method references
Controlling Program Flow- Work with records and sealed classes
- Use switch expressions and pattern matching
- Apply decision statements and loops

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

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

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

Correct Answer: A  🗳️

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Question #2

Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

  • A. 2
  • B. 0
  • C. Optional.empty
  • D. Optional[1]
  • E. An exception is thrown
  • F. Compilation fails
  • G. 1
Reveal Solution  Discussion  0

Correct Answer: G  🗳️

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Question #3

What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

  • A. Compilation error
  • B. C
  • C. C:
  • D. home
  • E. IllegalArgumentException
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

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Question #4

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

  • A. Stream stream = Stream.of();
  • B. Stream<String> stream = Stream.builder().add("a").build();
  • C. Stream stream = Stream.generate(() -> "a");
  • D. Stream stream = new Stream();
  • E. Stream stream = Stream.ofNullable("a");
  • F. Stream stream = Stream.of("a");
  • G. Stream stream = Stream.empty();
Reveal Solution  Discussion  0

Correct Answer: B,D  🗳️

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Question #5

Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

  • A. US=UK
  • B. An exception is thrown.
  • C. =US-UK
  • D. Compilation fails.
  • E. US-UK
  • F. -US=UK
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

Explanation: Only visible for TroytecDumps members. You can sign-up / login (it's free).

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