Oracle Java SE 21 Developer Professional : 1z1-830

1z1-830 real exams

Exam Code: 1z1-830

Exam Name: Java SE 21 Developer Professional

Updated: Aug 16, 2026

Q & A: 85 Questions and Answers

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Oracle 1z1-830 Exam Syllabus Topics:

SectionObjectives
Topic 1: Java I/O and NIO- Use Path, Files, and related APIs
- Process file system resources
- Read and write files
Topic 2: Annotations and JDBC- Use built-in and custom annotations
- Connect to databases using JDBC
- Execute SQL operations and process results
Topic 3: Functional Programming- Work with functional interfaces
- Use lambda expressions and method references
- Process data using Stream API
Topic 4: Controlling Program Flow- Use switch expressions and pattern matching
- Work with records and sealed classes
- Apply decision statements and loops
Topic 5: Collections and Generics- Apply generics and bounded types
- Use List, Set, Map, Queue, and Deque implementations
- Use sequenced collections and maps
Topic 6: Modules and Packaging- Create and use Java modules
- Manage dependencies and exports
- Package and deploy applications
Topic 7: Handling Date, Time, Text, Numeric and Boolean Values- Use date, time, duration, period, and localization APIs
- Use String, StringBuilder, and related APIs
- Work with primitive wrappers and number formatting
Topic 8: Object-Oriented Programming- Implement encapsulation and abstraction
- Create and use classes, interfaces, enums, and records
- Apply inheritance and polymorphism
Topic 9: Java Concurrency- Create and manage threads
- Use virtual threads
- Work with concurrent collections and executors
Topic 10: Exception Handling- Handle checked and unchecked exceptions
- Create custom exceptions
- Use try-with-resources

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following can be the body of a lambda expression?

A) Two expressions
B) None of the above
C) A statement block
D) An expression and a statement
E) Two statements


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


3. 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) US-UK
C) An exception is thrown.
D) -US=UK
E) Compilation fails.
F) US=UK


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

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


5. Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?

A) Nothing
B) An exception is thrown at runtime.
C) vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
D) Compilation fails.


Solutions:

Question # 1
Answer: C
Question # 2
Answer: A
Question # 3
Answer: A
Question # 4
Answer: E,F
Question # 5
Answer: D

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